کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
779278 1464116 2011 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
A finite element study of thermal relaxation of residual stress in laser shock peened IN718 superalloy
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی مکانیک
پیش نمایش صفحه اول مقاله
A finite element study of thermal relaxation of residual stress in laser shock peened IN718 superalloy
چکیده انگلیسی

The residual stresses in laser shock peened (LSP) Inconel 718 Ni-base superalloy and their thermal relaxation behavior were investigated based on three-dimensional nonlinear finite element analysis. To account for the nonlinear constitutive behavior, the Johnson–Cook model has been employed and the model parameters for high strain rate response of IN718 are calibrated by comparison with recent experimental results. Based on the LSP simulation, the thermal relaxation behavior was studied through coupled thermal-structure analysis in LS-DYNA. More specifically, the effects of test temperature, exposure time and degree of initial plastic deformation are analyzed and discussed. It is observed that stress relaxation mainly occurs during the initial period of exposure, and the relaxation amplitude increases with the increase of applied temperature and as-peened plastic deformation. Based on the simulation results, an analytical model based on Zener–Wert–Avrami function is proposed to model the thermal residual stress relaxation.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Impact Engineering - Volume 38, Issue 7, July 2011, Pages 590–596
نویسندگان
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