|This report is an archived publication and may contain dated technical, contact, and link information|
Publication Number: FHWA-HRT-05-157
Date: October 2003-September 2005
Technical Publications Catalog
Evaluation of LS-DYNA Soil Material Model 147
This report documents the evaluation of a new soil material model intended for roadside safety simulation applications using the nonlinear finite-element code LS-DYNA. This report concentrates on the 18 parameters required for the soil material. The focus is on obtaining the appropriate parameter values, providing an engineering understanding of the parameters, and providing bounds for the effects of varying the parameters.
TFHRC Technical Reference Center and http://www.fhwa.dot.gov/publications/research/safety/04094/index.cfm
Manual for LS-DYNA Soil Material Model 147
This is the final report for the development of the FHWA's soil model implemented into LS-DYNA. This report is in three sections: (1) the research plan, (2) the user's manual, and (3) examples that show the expected results of the model.
TFHRC Technical Reference Center and http://www.fhwa.dot.gov/publications/research/safety/04095/index.cfm
Evaluation of the Particulate Additive Test
The objective of this study is to acquire and/or develop commercially available equipment for conducting the Particulate Additive Test and Laboratory Stability Test (LAST). These tests were developed under the National Cooperative Highway Research Program (NCHRP) Project 9-10 entitled "Protocols for Modified Asphalt Binders." In the course of the study, the established protocols were evaluated and methods for improving the test were explored. Based on the results, recommendations were presented to the Superior Performing Asphalt Pavements (Superpave®) Binder Expert Task Group regarding the utility of these tests.
Evaluation of the Laboratory Asphalt Stability Test
LAST was proposed by NCHRP 9-10 program researchers as a possible new method to evaluate the storage stability of modified asphalts. The test involved exposing the binders with and without mechanical agitation at elevated temperatures for extended lengths of time to assess the thermal stability of the binders. FHWA was assigned the responsibility for evaluating the LAST. The task involved (1) procuring a commercial version of the LAST, (2) correcting perceived deficiencies, and (3) evaluating the test method thoroughly.