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About the Material Data in DS-Engineering.3dxml

The linear elastic, density, and thermal properties of the metallic materials in the DS-Engineering.3dxml library come from the Metals Handbook Desk Edition (2nd Edition), ASM International. The material properties for the plastic materials in the DS-Engineering.3dxml library were reviewed by Matereality in 2009.

The work hardening plasticity properties for the metallic materials in DS-Engineering.3dxml has been estimated based on the available material properties in the Metals Handbook. In DS-Engineering.3dxml the plasticity data are presented with the Johnson-Cook plasticity option using parameters $A$, $B$, and $n$. The Johnson-Cook parameter $m$ is set to zero, because $m$ only affects strain-rate dependent behavior, which is not included in these material definitions. The parameter $A$ is the yield stress at 0% offset, and the parameters $B$ and $n$ define the hardening curve. Because the yield stress provided in the Metals Handbook was measured at 0.2% offset and the Johnson-Cook equation requires yield stress at 0% offset, the Metals Handbook data required conversion before they could be used in the Johnson-Cook equation. A two-parameter power law, called the Hollomon equation, was used to determine $n$, which is the strain at ultimate tensile strength. Then the Johnson-Cook parameters $A$ and $B$ were calculated using $n$ together with the handbook yield and ultimate tensile strength.

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