Abstract
In this paper, cyclic stress-strain behavior of POM was studied. Fatigue tests were carried out under symmetric uniaxial strain-controlled mode. In this case of loading conditions the material exhibited cyclic softening and with the increase of strain amplitude the total number of cycles to failure reduced dramatically. Additional fatigue tests were further performed under non-symmetrical uniaxial cyclic loading where specimens exhibited relaxation behavior and mean stress reached a zero value in continuous cycles. Experimental tests were performed using an INSTRON 8802 servo-hydraulic machine and the results obtained from the experiments were compared with numerical results. The numerical analysis was carried out by ABAQUS software using the following advanced plasticity models based on Von Mises criterion: isotropic hardening, linear kinematic hardening, and non-linear isotropic/kinematic hardening.
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