Ratcheting Prediction of 1070 Steel samples under Asymmetric Uniaxial Stress Cycles by means of Kinematic Hardening Rules

سال انتشار: 1392
نوع سند: مقاله کنفرانسی
زبان: انگلیسی
مشاهده: 1,020

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شناسه ملی سند علمی:

WMECH02_011

تاریخ نمایه سازی: 21 تیر 1393

چکیده مقاله:

The present study predicts ratcheting response of 1070 steel samples using nonlinear kinematic hardening rules of Ohno-Wang (O-W), Jiang-Sehitoglu (J-S) and Ahmadzadeh-Varvani (A-V) under uniaxial stress cycles. The ratcheting values predicted based on the O-W model were noticeably influenced by the magnitude of exponents and the number of backstress components. The J-S kinematic hardening rule holding numerous constants, encountered the effect of stress level in ratcheting assessment. Taking into account both material and cyclic stress level dependent coefficients, the A-V hardening rule offered a simple framework to predict ratcheting strain over loading cycles. A comparative study of these hardening rules to assess ratcheting of 1070 steel samples undergoing uniaxial loading conditions resulted in a close agreement of the A-V, O-W and J-S models. The choice of hardening rules in the assessment of materials ratcheting was further discussed based on the complexity of the hardening rule, number of constants/coefficients required to characterize ratcheting response and CPU time required to run the models.

نویسندگان

G.R Ahmadzadeh

Postdoctoral fellow

A Varvani-Farahani

Professor, Department of Mechanical Engineering, Ryerson University, ۳۵۰ Victoria Street, Toronto, Ontario M۵B ۲K۳, Canada

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