True Stress-True Strain Curves Obtained by Simulating Tensile Tests Using Finite Element Program

An algorithm for extracting the equivalent-plastic (EP) stress–strain (SS) curve of a necking material in tensile test is proposed, which traces the force–elongation curve via iterative finite element (FE) simulations without assuming a constitutive model. The presented algorithm is suitable for a general-purpose FE solver available to a general audience. In the FE simulation and experiment, a slightly tapered geometry was employed around the specimen center to stably initiate necking there. The proposed algorithm and mentioned necking initiation method have been applied to extracting the EP SS curve of a high-strength steel material from the tensile test using an axisymmetric specimen. Because necking was initiated stably in simulation at the specimen center for a range of mesh sizes, the convergence of the extracted EP SS curve with the mesh size could be successfully verified. The EP SS curve of the tested material was extracted up to an EP strain of 0.85 with average strain intervals of approximately 2.5 mili-strain. The error values were less than 0.2 and 0.1% after four and seven FE simulations, respectively. The presented algorithm and necking initiation method in simulation can also be used for simultaneously quantifying the fracture EP strain of a necking material in the tensile test.

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True Stress-True Strain Curves Obtained by Simulating Tensile Tests Using Finite Element Program

Cited by 7 publications

References 9 publications

A methodology for determining the true stress-strain curve of SA-508 low alloy steel from a tensile test with finite element analysis

A methodology for determining the true stress-strain curve of SA-508 low alloy steel from a tensile test with finite element analysis

Finite element simulation of fatigue crack growth

Extraction of Equivalent Stress Versus Equivalent Plastic Strain Curve of Necking Material in Tensile Test Without Assuming Constitutive Model

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