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Publication Number: FHWA-HRT-04-097
Date: August 2007

Measured Variability Of Southern Yellow Pine - Manual for LS-DYNA Wood Material Model 143

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Introduction

This manual is divided into three main sections. Section 1, “Theoretical Manual,” begins with a general description of wood behavior, then continues with a detailed theoretical description of the model as implemented in LS-DYNA, version 970. It contains equations for all the formulations that are implemented. These include:

  • Transversely isotropic constitutive equations.
  • Yield surfaces with plastic flow.
  • Prepeak and late-time hardening.
  • Damage-based softening with erosion.
  • Rate effects for high strain-rate applications.

One feature of the wood material model that is different from all other LS-DYNA material models implemented to date are the initialization routines that provide the user with default input parameters for southern yellow pine and Douglas fir. These initialization routines set the required strengths, stiffnesses, hardening, softening, and rate-effect parameters as a function of moisture content, temperature, and grade. Section 1 describes all test data and assumptions that are used to set the default input parameters for pine and fir.

Section 2, “User’s Manual,” describes the wood model input and output in LS-DYNA format. It includes descriptions of all input parameters, methods of fitting the model to the data, and a brief theoretical description of the model. This section is intended to be a manual for users who want to apply the model without delving deeply into the theory of the model. Most of the information contained in this section was forwarded for inclusion in the LS-DYNA User’s Manual.(5)

Section 3, “Examples Manual,” provides example problems, including input files and output plots. These include four single-element simulations and one bogie impact simulation. These example problems are intended to help the user become familiar with the application of the wood material model.

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