Convert to Cyclic Plastic Strain ?
Convert to Cyclic Plastic Strain ?
(OP)
Hi all,
I'm trying to analyse a specimen in Abaqus using kinematic hardening models, the way I understand it is that I need to get the material parameters from curve fitting a stabilized stress-strain curve. All I have is an engineering stress-strain curve but am I correct in assuming I need a Stress - Plastic Strain curve? How do I go about calculating this as if I simply get the tensile plastic component I lose symmetry so I must be doing something wrong.
Hope someone can help!!
I'm trying to analyse a specimen in Abaqus using kinematic hardening models, the way I understand it is that I need to get the material parameters from curve fitting a stabilized stress-strain curve. All I have is an engineering stress-strain curve but am I correct in assuming I need a Stress - Plastic Strain curve? How do I go about calculating this as if I simply get the tensile plastic component I lose symmetry so I must be doing something wrong.
Hope someone can help!!





RE: Convert to Cyclic Plastic Strain ?
Under cyclic loads, many materials harden or soften so their stress-strain curve deviates from that obtained under static loads. But after a sufficiently high number of cycles, the hysteresis loop typically assumes a constant shape or in other words it becomes stable. By loading a set of specimens at different strain/stress amplitudes and measuring their stress/strain response once the initial work hardening or softening stage is consumed, a stabilised stress-strain curve can be constructed.
You will now understand that the stabilised stress-strain curve is definitely not a static stress-strain curve missing the elastic part.
RE: Convert to Cyclic Plastic Strain ?