کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7174775 1465565 2018 40 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
On a dislocation-based constitutive model and dynamic thermomechanical considerations
ترجمه فارسی عنوان
بر اساس مدل سازنده مبتنی بر جابجایی و ملاحظات حرارتی مکانیکی پویا
کلمات کلیدی
ضریب تیلور کویننی، جابجایی، مواد وابسته به میزان، رفتار سازمانی، نوار کلسکی،
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی مکانیک
چکیده انگلیسی
Dislocation-based constitutive models are widely used to predict the plastic behavior of metallic materials, in both quasi-static and dynamic conditions. In addition, if the ratio of (adiabatic) thermomechanical (plastic work to heat) conversion is known, the stress-strain-temperature relationship can be estimated. The main purpose of this study was to verify the applicability of a widely-used expression (where the strain energy of a plastically deformed material is proportional to the density of dislocations) to calculate the stored energy in the material, which can be used in parallel with the micromechanical model to estimate the temperature rise during dynamic plastic deformation. An experimental campaign, where Kolsky (split Hopkinson) pressure bar tests were combined with in situ infrared temperature measurements, was conducted on OFHC copper compression specimens. The analytical thermomechanical conversion was compared with the experimental one, revealing a significant discrepancy between the two. An empirical ad hoc factor was introduced in the analytical expression in order to describe adequately the thermomechanical response of the material under dynamic (impact) loading conditions.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Plasticity - Volume 108, September 2018, Pages 55-69
نویسندگان
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