ASME Material Generator Documentation

Table of contents

ASME Material Generator - General

From the Extensions menu, click “Manage Extension…”
Mark the extension to load
Display System Properties from “View > Properties”
Add an ASME Material Generator System to the project page and click on “Material” to edit the properties.

“ASME Material Generator [MPa]”: Material properties defined in MPa
“ASME Material Generator [psi]”: Material properties defined in psi

Modulus of Elasticity (Ey), Engineering Yield Stress (sig_ys) and Engineering Ultimate Tensile Stress (sig_uts) must be specified at the temperature of interest.
Derating factor (DF) is applied to the Yield Stress (sig_ys) and the Ultimate Tensile Stress (sig_uts) to obtain σ_ys and σ_uts as defined and used in ASME [ASME 2013 VIII Div.2 / KD-231.4, ASME VIII div.3]
Material Type must be selected from the drop list according to ASME [Table 3-D.1, ASME 2013 VIII Div.2 / Table KD-230.5, ASME VIII Div.3]
Number points is the number of points used in ANSYS true stress true plastic strain curve.
More points are placed where the slope is greater. Points are not equally spaced.
Curve Start Point is the first point of the ANSYS true stress true plastic strain curve.
The input required to define ANSYS multilinear hardening is the true stress – true plastic strain data points, starting at the point where true plastic strain is zero.
The true stress – true total strain curve prescribed by ASME is a smooth curve, transitioning from the elastic to the inelastic range.
Data points may be included by the user below the minimum yield stress.

Right-click on the “Material” cell and click “Update” to create or update the material.
If the material name exists the Young’s Modulus, Poisson’s ratio and Multilinear Kinematic/Isotropic Hardening are replaced with the new values.
The “Extension Log File” displays the input parameters, the derived parameters and the true strain-stress curve data.

The stress-strain curve is generated following the ASME formula
[Appendix 3-D, ASME 2013 VIII Div.2 / KD-231.4, ASME VIII div.3]
An isotropic elasticity and multilinear isotopic hardening plasticity with Young modulus, Poisson’s ratio and true stress true plastic strain from data built in accordance with ASME is generated.
The true stress true plastic strain data are calculated from the ASME built true stress true total strain data by subtracting the full elastic strain component (i.e.: true stress data point / modulus of elasticity)
The last user-defined true stress data point corresponds to ASME true ultimate tensile strength variable σuts,t [Eq. 3-D.13, ASME 2013 VIII Div.2 / Eq. KD-231.13, ASME VIII div.3]
Ansys stress-strain curve slope is be zero beyond the last user-defined stress-strain data point (i.e.: perfectly plastic)

The created material may be edited to add additional properties, e.g. Density as well as set the “Temperature” for the Young’s Modulus and Isotropic Hardening.

The created material can be saved in an “ASME material” library.
(Create the library first)
Select the material and export: “File>Export Engineering Data…”
Enable editing on the “ASME material” library.
Select the library and import the material file “File>Import Engineering Data…”

The material properties may also be defined in “psi” unit system.
The Engineering data is always saved in “SI” units but can be edited in “Project Units”.

The included demo project “ASMEMaterialGenerator_V201.3.wbpj” contains typical materials for all material types.
The stress-strain curves are verified in system H.