کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
782503 | 1465012 | 2013 | 15 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Non-linear elastic characterisation of a high strength bainitic roller bearing steel Non-linear elastic characterisation of a high strength bainitic roller bearing steel](/preview/png/782503.png)
A small but not negligible non-linear elastic behaviour was detected when investigating cyclic uniaxial push–pull experiments on a high strength bainitic steel. Cyclic torsion experiments led to the conclusion that the shear modulus was relatively constant. A non-linear elastic model was implemented where the bulk modulus was extended with a second order term related to the elastic dilatation and where the shear modulus was constant. The material presented a strength differential effect (SDE), with larger yield stress in compression than in tension. Consequently, the non-linear elastic model was combined with a plasticity model that incorporated a Drucker–Prager yield surface, non-associated flow rule and combined non-linear hardening. Expressions that include non-linear elasticity were derived for the elastic–plastic hardening and the compliance tensors. The extended material model predicted the elastic–plastic results from cyclic push–pull experiments. Also, a phenomenological analysis of the cyclic elastic response showed isotropic damage in the elastic moduli. The steady-state damage increased linearly with the cyclic plastic strain range.
► The high strength bainitic steel displayed non-linear elasticity at cyclic uniaxial experiments.
► Non-linear elasticity was related to the bulk modulus; the shear modulus was constant.
► Non-linear elasticity was included in the non-associated pressure sensitive plasticity model.
► The cyclic elastic response showed isotropic damage in the elastic moduli.
Journal: International Journal of Mechanical Sciences - Volume 68, March 2013, Pages 1–15