True Stress and True Strain Curve


The lab has the capability to measure the stress and strain relation for any sheet metal under uniaxial loading condition. This stress and strain relation is digitized in terms of true stress and true plastic strain. The data can be directly input into any computer model using the finite element method requiring a material stress and strain relation. Unlike a standard tension test, a single test speed is usually used during the entire test period to determine this stress and strain relation of the material. 

Usually, the virgin flat sheet is used to determine this stress and strain relation. For hydroforming applications, a tensile specimen can be directly cut from a tube to determine the stress and strain relation after tubing. For some structural analyses, however, the tensile specimen may be cut from an as-formed (after stamping) part to determine the stress and strain relation after forming.

For this special lab test service, please contact Dr. Ming Shi, technical manager- Advanced Applications Technology.