کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
797977 1467562 2006 13 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Constitutive relations for copper under shock wave loading: Twinning activation
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی مکانیک
پیش نمایش صفحه اول مقاله
Constitutive relations for copper under shock wave loading: Twinning activation
چکیده انگلیسی

The simulation of shock-loading sequences in numerical hydrocodes includes the representation of shock fronts as continuous transitions in which the equations of mechanics are solved just as in the rest of the structure. Nonetheless, the elasto-plastic transformations are specific and, for some materials, the elasto-plastic models usually used in dynamic problems do not apply within these fronts. A constitutive law is developed in this study for copper, for dynamic problems to be used both inside and outside shock fronts. The Zerilli and Armstrong formulation is modified to take into account twinning activation under such conditions: twinning and dislocation glide are treated as two competing plastic deformation mechanisms, each having its own flow stress. The mechanical characterization of samples recovered after various shock tests and the numerical simulation of these tests are used to identify coefficients for this plasticity model.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Mechanics of Materials - Volume 38, Issue 3, March 2006, Pages 173–185
نویسندگان
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