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Publication Number:  FHWA-HRT-14-093    Date:  December 2014
Publication Number: FHWA-HRT-14-093
Date: December 2014

 

Interlaboratory Variability of Slip Coefficient Testing for Bridge Coatings

APPENDIX A. DATA PLOTS

This appendix contains the load versus slip plots for all specimens tested as part of the interlaboratory variability study. For each coating series, the plots are scaled uniformly for the three or four labs participating to highlight the differences between individual laboratory practice in conducting the RCSC test. Lab 4 only participated in half of the coating series.

For some graphs, the individual data plots within them may be so close to each other that it is difficult to discern one line from the other. To assist readers, a black dashed line has been drawn intersecting all plots at one section. The dashed line is connected to a leader line that connects to the legend. The order of the legend from top to bottom correlates to the order in which the dashed line intersects the individual plots. The intersected plot furthest from the leader is the top entry in the legend, and the intersection closest to the leader is at the bottom of the legend.

This graph shows load versus slip displacement curves for lab 1 coating A1. Load is on the y-axis from 0 to 60 kip. The x-axis shows the slip from -0.005 to 0.050 inch. Five lines are plotted distinguished by color: red for specimen 1, black for specimen 2, green for specimen 3, orange for specimen 4, and blue for specimen 5. All lines plot fairly close to each other with linear behavior to approximately 50 kip at 0.01 inch of slip followed by constant load response for the extent of the graph.
Figure 10. Graph. Load versus slip displacement curves for lab 1 coating A1.

This graph shows load versus slip displacement curves for lab 2 coating A1. Load is on the y-axis from 0 to 60 kip. The x-axis shows the slip from -0.005 to 0.050 inch. Five lines are plotted distinguished by color: red for specimen 1, black for specimen 2, green for specimen 3, orange for specimen 4, and blue for specimen 5. All lines plot with an initially upward curved shakedown response followed by a linear portion and rounding over to a constant load plateau. None of the lines attained peak load response prior to the 0.02-inch failure criterion, and the tests were terminated at displacements ranging between 0.04 and 0.048 inch.
Figure 11. Graph. Load versus slip displacement curves for lab 2 coating A1.

This graph shows load versus slip displacement curves for lab 3 coating A1. Load is on the y-axis from 0 to 60 kip. The x-axis shows the slip from -0.005 to 0.050 inch. Five lines are plotted distinguished by color: red for specimen 1, black for specimen 2, green for specimen 3, orange for specimen 4, and blue for specimen 5. All lines plot with an initially upward curved shakedown response followed by a linear portion and rounding over to a constant load plateau. All lines show tests were terminated at approximately 0.02 inch of slip, and at that point all lines were showing constant load behavior.
Figure 12. Graph. Load versus slip displacement curves for lab 3 coating A1.

This graph shows load versus slip displacement curves for lab 1 coating A2. Load is on the y-axis from 0 to 60 kip. The x-axis shows the slip from -0.005 to 0.050 inch. Five lines are plotted distinguished by color: red for specimen 1, black for specimen 2, green for specimen 3, orange for specimen 4, and blue for specimen 5. All lines plot with an initially upward curved shakedown response followed by a linear portion and rounding over to a constant load plateau. All lines show constant load response out to 0.05 inch. Specimens 1, 4, and 5 attained peak load before the 0.02-inch slip criterion, and specimens 2 and 3 were controlled by the 0.02-inch slip criterion.
Figure 13. Graph. Load versus slip displacement curves for lab 1 coating A2.

This graph shows load versus slip displacement curves for lab 2 coating A2. Load is on the y-axis from 0 to 60 kip. The x-axis shows the slip from -0.005 to 0.050 inch. Five lines are plotted distinguished by color: red for specimen 1, black for specimen 2, green for specimen 3, orange for specimen 4, and blue for specimen 5. All lines plot with an initially upward curved shakedown response followed by a linear portion and rounding over to a constant load plateau. None of the lines attained peak load response prior to the 0.02-inch failure criterion, and the tests were terminated at displacements ranging between 0.04 and 0.048 inch.
Figure 14. Graph. Load versus slip displacement curves for lab 2 coating A2.

This graph shows load versus slip displacement curves for lab 3 coating A2. Load is on the y-axis from 0 to 60 kip. The x-axis shows the slip from -0.005 to 0.050 inch. Five lines are plotted distinguished by color: red for specimen 1, black for specimen 2, green for specimen 3, orange for specimen 4, and blue for specimen 5. All lines plot with an initially upward curved shakedown response followed by a linear portion and rounding over to a constant load plateau. The tests were terminated at displacements ranging between 0.036 and 0.045 inch. All specimens except specimen 4 attained peak load prior to the 0.02-inch slip criterion.
Figure 15. Graph. Load versus slip displacement curves for lab 3 coating A2.

This graph shows load versus slip displacement curves for lab 4 coating A2. Load is on the y-axis from 0 to 60 kip. The x-axis shows the slip from -0.005 to 0.050 inch. Five lines are plotted distinguished by color: red for specimen 1, black for specimen 2, green for specimen 3, orange for specimen 4, and blue for specimen 5. All lines plot with an initially upward curved shakedown response followed by a linear portion and rounding over to a constant load plateau. The tests were terminated beyond a slip of 0.05 inch. All plots attained peak loads before the 0.02-inch slip criterion.
Figure 16. Graph. Load versus slip displacement curves for lab 4 coating A2.

This graph shows load versus slip displacement curves for lab 1 coating B1. Load is on the y-axis from 0 to 60 kip. The x-axis shows the slip from -0.005 to 0.050 inch. Five lines are plotted distinguished by color: red for specimen 1, black for specimen 2, green for specimen 3, orange for specimen 4, and blue for specimen 5. All lines plot with an initially upward curved shakedown response followed by a linear portion and rounding over to a constant load plateau. The tests were terminated beyond a slip of 0.05 inch. All plots attained peak loads between 0.012 and 0.018 inch of slip.
Figure 17. Graph. Load versus slip displacement curves for lab 1 coating B1.

This graph shows load versus slip displacement curves for lab 2 coating B1. Load is on the y-axis from 0 to 60 kip. The x-axis shows the slip from -0.005 to 0.050 inch. Five lines are plotted distinguished by color: red for specimen 1, black for specimen 2, green for specimen 3, orange for specimen 4, and blue for specimen 5. All lines plot with an initially upward curved shakedown response followed by a linear portion and rounding over to a constant load plateau. The tests were terminated at displacements ranging between 0.020 and 0.035 inch. Peak loads were attained at displacements ranging from 0.012 to 0.020 inch.
Figure 18. Graph. Load versus slip displacement curves for lab 2 coating B1.

This graph shows load versus slip displacement curves for lab 3 coating B1. Load is on the y-axis from 0 to 60 kip. The x-axis shows the slip from -0.005 to 0.050 inch. Five lines are plotted distinguished by color: red for specimen 1, black for specimen 2, green for specimen 3, orange for specimen 4, and blue for specimen 5. All lines plot with an initially upward curved shakedown response followed by a linear portion and rounding over to a constant load plateau. All the specimens were terminated at a displacement of 0.020 inch. Specimen 5 exhibited extremely stiff behavior with either no or negative displacement as load increased to approximately 44 kip before it started to round over to a plateau.
Figure 19. Graph. Load versus slip displacement curves for lab 3 coating B1.

This graph shows load versus slip displacement curves for lab 1 coating B2. Load is on the y-axis from 0 to 70 kip. The x-axis shows the slip from -0.005 to 0.050 inch. Five lines are plotted distinguished by color: red for specimen 1, black for specimen 2, green for specimen 3, orange for specimen 4, and blue for specimen 5. All lines plot with an initially upward curved shakedown response followed by a linear portion and rounding over to a constant load plateau. The tests were terminated beyond a slip of 0.05 inch. All plots attained peak loads between 0.020 and 0.025 inch.
Figure 20. Graph. Load versus slip displacement curves for lab 1 coating B2.

This graph shows load versus slip displacement curves for lab 2 coating B2. Load is on the y-axis from 0 to 70 kip. The x-axis shows the slip from -0.005 to 0.050 inch. Five lines are plotted distinguished by color: red for specimen 1, black for specimen 2, green for specimen 3, orange for specimen 4, and blue for specimen 5. All specimens have an initially upward curved shakedown response, but each differs after that. Specimen 1 is linear to approximately 50 kip at 0.01 inch and constant thereafter until 0.025 inch when the test was terminated. Specimen 2 continued to curve upward nonlinearly until about 53 kip at 0.008 inch followed by a linear rise to about 60 kip at 0.015 inch. It then hooked backwards to 0.012 inch followed by a linear increase to about 73 kip at 0.02 inch when the test was terminated. Specimen 3 continued to curve upward nonlinearly to about 25 kip at 0.005 inch followed by a leftward-facing hook maximized at about 45 kip and 0.015 inch ending at about 55 kip at -0.002 inch. It then increased linearly to peak load response at about 71 kip at 0.025 inch. Specimen 4 increased linearly to about 52 kip at 0.02 inch and was constant until a displacement of 0.045 inch when the test was terminated. Specimen 5 increased linearly to about 30 kip at 0.015 inch followed by a brief load plateau and another linearly increasing trend to peak load of about 58 kip at 0.025 inch and constant until termination at 0.037 inch.
Figure 21. Graph. Load versus slip displacement curves for lab 2 coating B2.

This graph shows load versus slip displacement curves for lab 3 coating B2. Load is on the y-axis from 0 to 70 kip. The x-axis shows the slip from -0.005 to 0.050 inch. Five lines are plotted distinguished by color: red for specimen 1, black for specimen 2, green for specimen 3, orange for specimen 4, and blue for specimen 5. Specimens 1, 3, 4, and 5 plot with an initially upward curved shakedown response followed by a linear portion and rounding over to peak load. Specimen 2 initially hooked backwards to about 18 kip at -0.003 inch followed by linear behavior to a load plateau. All tests were terminated at a displacement of about 0.020 inch.
Figure 22. Graph. Load versus slip displacement curves for lab 3 coating B2.

This graph shows load versus slip displacement curves for lab 1 coating C1. Load is on the y-axis from 0 to 70 kip. The x-axis shows the slip from -0.005 to 0.050 inch. Five lines are plotted distinguished by color: red for specimen 1, black for specimen 2, green for specimen 3, orange for specimen 4, and blue for specimen 5. All lines plot with an initially upward curved shakedown response followed by a linear portion and rounding over to a constant load plateau. The tests were terminated beyond a slip of 0.05 inch. All plots attained peak loads between 0.018 and 0.021 inch.
Figure 23. Graph. Load versus slip displacement curves for lab 1 coating C1.

This graph shows load versus slip displacement curves for lab 2 coating C1. Load is on the y-axis from 0 to 70 kip. The x-axis shows the slip from -0.005 to 0.050 inch. Five lines are plotted distinguished by color: red for specimen 1, black for specimen 2, green for specimen 3, orange for specimen 4, and blue for specimen 5. All lines plot with an initially upward curved shakedown response followed by a linear portion and rounding over to a constant load plateau. The tests were terminated beyond a slip of 0.05 inch. Specimen 1 also showed and interim plateau before reaching peak load. All plots attained peak load at displacements ranging between 0.025 and 0.045 inch, and tests were terminated at displacements ranging from 0.030 and 0.045 inch.
Figure 24. Graph. Load versus slip displacement curves for lab 2 coating C1.

This graph shows load versus slip displacement curves for lab 3 coating C1. Load is on the y-axis from 0 to 70 kip. The x-axis shows the slip from -0.005 to 0.050 inch. Five lines are plotted distinguished by color: red for specimen 1, black for specimen 2, green for specimen 3, orange for specimen 4, and blue for specimen 5. All specimens plot with an initially upward curved shakedown response followed by a linear portion and rounding over to peak load. Peak load was attained at slip displacements ranging from 0.007 to 0.015 inch, and tests were terminated at displacements between 0.015 and 0.020 inch.
Figure 25. Graph. Load versus slip displacement curves for lab 3 coating C1.

This graph shows load versus slip displacement curves for lab 4 coating C1. Load is on the y-axis from 0 to 70 kip. The x-axis shows the slip from -0.005 to 0.050 inch. Five lines are plotted distinguished by color: red for specimen 1, black for specimen 2, green for specimen 3, orange for specimen 4, and blue for specimen 5. All lines plot with an initially upward curved shakedown response followed by a linear portion and rounding over to a constant load plateau. Peak loads were attained at slip displacements ranging from 0.010 to 0.025 inch, and all tests were terminated beyond a slip of 0.05 inch.
Figure 26. Graph. Load versus slip displacement curves for lab 4 coating C1.

This graph shows load versus slip displacement curves for lab 1 coating C2. Load is on the y-axis from 0 to 70 kip. The x-axis shows the slip from -0.005 to 0.050 inch. Four lines are plotted distinguished by color: red for specimen 1, black for specimen 2, green for specimen 3, and blue for specimen 5. All lines plot with an initially upward curved shakedown response followed by a linear portion and rounding over to a constant load plateau. Peak load response was attained at slip displacements ranging from 0.015 to 0.025 inch, and all tests were terminated beyond a slip of 0.05 inch.
Figure 27. Graph. Load versus slip displacement curves for lab 1 coating C2.

This graph shows load versus slip displacement curves for lab 2 coating C2. Load is on the y-axis from 0 to 70 kip. The x-axis shows the slip from -0.005 to 0.050 inch. Five lines are plotted distinguished by color: red for specimen 1, black for specimen 2, green for specimen 3, orange for specimen 4, and blue for specimen 5. All lines plot with an initially upward curved shakedown response followed by a linear portion and rounding over to a constant load plateau. Specimen 2 showed a plateau load response at approximately 59 kip until about 0.025 inch of slip. It then picked up stiffness and slowly rose to 75 kip at 0.045 inch. All specimens attained peak load response at displacement ranges between 0.012 and 0.020 inch.
Figure 28. Graph. Load versus slip displacement curves for lab 2 coating C2.

This graph shows load versus slip displacement curves for lab 3 coating C2. Load is on the y-axis from 0 to 70 kip. The x-axis shows the slip from -0.005 to 0.050 inch. Five lines are plotted distinguished by color: red for specimen 1, black for specimen 2, green for specimen 3, orange for specimen 4, and blue for specimen 5. All specimens plot with an initially upward curved shakedown response followed by a linear portion and rounding over to peak load. Peak loads were attained at slip displacements ranging from 0.010 to 0.020 inch, and tests were terminated at displacements of approximately 0.020 inch.
Figure 29. Graph. Load versus slip displacement curves for lab 3 coating C2.

This graph shows load versus slip displacement curves for lab 4 coating C2. Load is on the y-axis from 0 to 70 kip. The x-axis shows the slip from -0.005 to 0.050 inch. Five lines are plotted distinguished by color: red for specimen 1, black for specimen 2, green for specimen 3, orange for specimen 4, and blue for specimen 5. All lines plot with an initially upward curved shakedown response followed by a linear portion and rounding over to a constant load plateau. Peak loads were attained at slip displacements ranging from 0.010 to 0.025 inch, and all tests were terminated beyond a slip of 0.05 inch.
Figure 30. Graph. Load versus slip displacement curves for lab 4 coating C2.

This graph shows load versus slip displacement curves for lab 1 coating D1. Load is on the y-axis from 0 to 60 kip. The x-axis shows the slip from -0.005 to 0.050 inch. Five lines are plotted distinguished by color: red for specimen 1, black for specimen 2, green for specimen 3, orange for specimen 4, and blue for specimen 5. All lines plot with an initially upward curved shakedown response followed by a linear portion and rounding over to a constant load plateau. Peak loads were attained at slip displacements ranging from 0.010 to 0.025 inch, and all tests were terminated beyond a slip of 0.05 inch.
Figure 31. Graph. Load versus slip displacement curves for lab 1 coating D1.

This graph shows load versus slip displacement curves for lab 2 coating D1. Load is on the y-axis from 0 to 60 kip. The x-axis shows the slip from -0.005 to 0.050 inch. Five lines are plotted distinguished by color: red for specimen 1, black for specimen 2, green for specimen 3, orange for specimen 4, and blue for specimen 5. Specimens 1, 3, 4, and 5 plot with an initially upward curved shakedown response followed by a linear portion and rounding over to peak load. Specimen 2 had an initially linear response until about 20 kip at 0.011 inch. Its load increased to 30 kip with no change in displacement and then reached a plateau in load while moving backwards in displacement to 0.007 inch. It then increased linearly to a plateau at about 52 kip at 0.020 inch. Peak loads were attained at slip displacements ranging from 0.020 to 0.032 inch, and tests were terminated at displacements ranging from 0.022 to 0.038 inch.
Figure 32. Graph. Load versus slip displacement curves for lab 2 coating D1.

This graph shows load versus slip displacement curves for lab 3 coating D1. Load is on the y-axis from 0 to 60 kip. The x- axis shows the slip from -0.005 to 0.050 inch. Five lines are plotted distinguished by color: red for specimen 1, black for specimen 2, green for specimen 3, orange for specimen 4, and blue for specimen 5. Specimens 1, 2, 3, and 5 showed essentially infinitely stiff response until about 25 to 40 kip and then rounded over to a plateau load response. Specimen 4 had an initially upward curved shakedown response followed by a linear portion and rounding over to peak load. Peak loads were attained at slip displacements ranging from 0.005 to 0.020 inch, and tests were terminated at displacements of approximately 0.020 inch.
Figure 33. Graph. Load versus slip displacement curves for lab 3 coating D1.

This graph shows load versus slip displacement curves for lab 1 coating D2. Load is on the y-axis from 0 to 70 kip. The x-axis shows the slip from -0.005 to 0.050 inch. Five lines are plotted distinguished by color: red for specimen 1, black for specimen 2, green for specimen 3, orange for specimen 4, and blue for specimen 5. All lines plot with an initially upward curved shakedown response followed by a linear portion and rounding over to a constant load plateau. Specimens 1, 3, 4, and 5 reached peak load at slip displacements ranging from 0.007 to 0.016 inch. Specimen 2 showed a characteristic double plateau response with the first at about 30 kip and 0.015 inch of slip. It then increased again to about 42 kip at 0.034 inch where it plateaued the second time. All tests were terminated beyond a slip of 0.05 inch.
Figure 34. Graph. Load versus slip displacement curves for lab 1 coating D2.

This graph shows load versus slip displacement curves for lab 2 coating D2. Load is on the y-axis from 0 to 70 kip. The x-axis shows the slip from -0.005 to 0.050 inch. Five lines are plotted distinguished by color: red for specimen 1, black for specimen 2, green for specimen 3, orange for specimen 4, and blue for specimen 5. All lines plot with an initially upward curved shakedown response followed by distinctly different paths for each specimen. Specimen 1 continued linearly to a peak at about 50 kip at a displacement of 0.014 inch and then decreased until test termination at 0.020 inch. Specimen 2 continued to slowly increase linearly until approximately 30 kip at 0.025 inch, and then the slope decreased and loading continued to about 40 kip at 0.050 inch. Specimen 3 continued nonlinear convex behavior until about 50 kip at 0.018 inch and then linearly ramped to about 65 kip at 0.050 inch. Specimen 4 was infinitely stiff from 10 to 49 kip at 0.007 inch, hooked backwards to 0.005 inch, and increased linearly to failure at 60 kip and 0.014 inch. Specimen 5 increased linearly to about 70 kip at 0.035 inch.
Figure 35. Graph. Load versus slip displacement curves for lab 2 coating D2.

This graph shows load versus slip displacement curves for lab 3 coating D2. Load is on the y-axis from 0 to 70 kip. The x-axis shows the slip from -0.005 to 0.050 inch. Five lines are plotted distinguished by color: red for specimen 1, black for specimen 2, green for specimen 3, orange for specimen 4, and blue for specimen 5. Specimens 1 and 2 showed infinitely stiff responses until about 40 kip and then rounded over to a plateau load response. Specimens 3, 4, and 5 had an initially upward curved shakedown response followed by a linear portion and rounding over to peak load. Peak loads for all five curves were at about 50 kip and 0.012 inch. All tests were terminated at displacements of approximately 0.020 inch.
Figure 36. Graph. Load versus slip displacement curves for lab 3 coating D2.

This graph shows load versus slip displacement curves for lab 1 coating E1. Load is on the y-axis from 0 to 60 kip. The x-axis shows the slip from -0.005 to 0.050 inch. Five lines are plotted distinguished by color: red for specimen 1, black for specimen 2, green for specimen 3, orange for specimen 4, and blue for specimen 5. All specimens had an initially upward curved shakedown response followed by a linear portion to a distinct hump at peak load followed by a linear descending branch to a lower plateau. The peak loads occurred at displacements ranging from 0.009 to 0.020 inch. All tests were terminated at displacements beyond 0.050 inch.
Figure 37. Graph. Load versus slip displacement curves for lab 1 coating E1.

This graph shows load versus slip displacement curves for lab 2 coating E1. Load is on the y-axis from 0 to 60 kip. The x-axis shows the slip from -0.005 to 0.050 inch. Five lines are plotted distinguished by color: red for specimen 1, black for specimen 2, green for specimen 3, orange for specimen 4, and blue for specimen 5. All specimens had an initially upward curved shakedown response followed by a linearly increasing portion, but then the differences become pronounced. Specimen 1 increased to about 45 kip at 0.010 inch, and then the test failed. Specimen 2 attained a distinct peak at about 45 kip at 0.016 inch, and then the load decreased quickly. Specimen 3 attained a distinct peak at about 45 kip at 0.009 inch, and then the test failed. Specimen 4 showed a double plateau response, with the first occurring at about 26 kip at 0.020 inch and then increased linearly to the second at about 39 kip at 0.031 inch. Specimen 5 showed a double plateau response, with the first occurring at about 26 kip at 0.010 inch and then increased linearly to the second at about 38 kip at 0.020 inch.
Figure 38. Graph. Load versus slip displacement curves for lab 2 coating E1.

This graph shows load versus slip displacement curves for lab 3 coating E1. Load is on the y-axis from 0 to 60 kip. The x-axis shows the slip from -0.005 to 0.050 inch. Five lines are plotted distinguished by color: red for specimen 1, black for specimen 2, green for specimen 3, orange for specimen 4, and blue for specimen 5. All specimens had an initially upward curved shakedown response followed by a linear portion and rounding over to peak load. Peak loads for all five curves were at loads between 35 and 46 kip, and displacements ranged between 0.006 and 0.009 inch.
Figure 39. Graph. Load versus slip displacement curves for lab 3 coating E1.

This graph shows load versus slip displacement curves for lab 4 coating E1. Load is on the y-axis from 0 to 60 kip. The x-axis shows the slip from -0.005 to 0.050 inch. Five lines are plotted distinguished by color: red for specimen 1, black for specimen 2, green for specimen 3, orange for specimen 4, and blue for specimen 5. All specimens had initially linear behavior increasing to a distinct peak load followed by a linear descending branch to a lower plateau. The peak loads ranged from about 41 to 46 kip over a displacement range of 0.010 and 0.015 inch. All tests were terminated at displacements in excess of 0.050 inch.
Figure 40. Graph. Load versus slip displacement curves for lab 4 coating E1.

This graph shows load versus slip displacement curves for lab 1 coating E2. Load is on the y-axis from 0 to 60 kip. The x-axis shows the slip from -0.005 to 0.050 inch. Five lines are plotted distinguished by color: red for specimen 1, black for specimen 2, green for specimen 3, orange for specimen 4, and blue for specimen 5. All specimens had initially linear behavior increasing to a distinct peak load followed by a linear descending branch to a lower plateau. The peak loads ranged from about 42 to 45 kip over a displacement range of 0.009 and 0.018 inch. All tests were terminated at displacements in excess of 0.050 inch.
Figure 41. Graph. Load versus slip displacement curves for lab 1 coating E2.

This graph shows load versus slip displacement curves for lab 2 coating E2. Load is on the y-axis from 0 to 60 kip. The x-axis shows the slip from -0.005 to 0.050 inch. Five lines are plotted distinguished by color: red for specimen 1, black for specimen 2, green for specimen 3, orange for specimen 4, and blue for specimen 5. All specimens had an initially upward curved shakedown response followed by a linearly increasing portion. Specimen 1 increased to about 33 kip at 0.008 inch, and then the test failed. Specimen 2 attained a distinct peak at about 32 kip at 0.008 inch, and then the test failed. Specimen 3 increased to about 16 kip at 0.010 inch, and then the test failed. Specimen 4 increased to about 41 kip at 0.013 inch, and then the test failed. Specimen 5 increased to a round over response followed by a 41-kip load plateau until failure at 0.020 inch.
Figure 42. Graph. Load versus slip displacement curves for lab 2 coating E2.

This graph shows load versus slip displacement curves for lab 3 coating E2. Load is on the y-axis from 0 to 60 kip. The x-axis shows the slip from -0.005 to 0.050 inch. Three lines are plotted distinguished by color: red for specimen 1, black for specimen 2, and green for specimen 3. Specimens 1 and 2 had an initially upward curved shakedown response followed by a linearly increasing portion and ultimately a round over response at a load plateau before the final displacement of about 0.020 inch. Specimen 3 had three distinct load plateaus with infinitely stiff response between them. The first plateau occurred at about 9 kip, the second at about 15 kip, and the final at about 32 kip at 0.005 inch. It stayed at that load until approximately 0.020 inch when the test terminated.
Figure 43. Graph. Load versus slip displacement curves for lab 3 coating E2.

This graph shows load versus slip displacement curves for lab 4 coating E2. Load is on the y-axis from 0 to 60 kip. The x-axis shows the slip from -0.005 to 0.050 inch. Five lines are plotted distinguished by color: red for specimen 1, black for specimen 2, green for specimen 3, orange for specimen 4, and blue for specimen 5. All specimens had initially linear behavior increasing to a distinct peak load followed by a linear descending branch to a lower plateau. The peak loads ranged from about 40 to 45 kip over a displacement range of 0.010 and 0.015 inch. All tests were terminated at displacements in excess of 0.050 inch.
Figure 44. Graph. Load versus slip displacement curves for lab 4 coating E2.

 

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