کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10656438 | 1005482 | 2016 | 11 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Variation of strain rate sensitivity of an aluminum alloy in a wide strain rate range: Mechanism analysis and modeling
ترجمه فارسی عنوان
تنوع حساسیت سرعت کرنش یک آلیاژ آلومینیوم در یک محدوده نرخ تنش گسترده: تجزیه و تحلیل و مدل سازی مکانیسم
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کلمات کلیدی
حساسیت نرخ فشار، نرخ کرنش بالا تشکیل می شود. مکانیسم، آلیاژ آلومینیوم،
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
چکیده انگلیسی
The significant variation of strain rate sensitivity (SRS), i.e. the non-linear characteristics of SRS, within wide strain and strain rate ranges in high strain rate forming (HSRF) leads to the complexity of constitutive behaviors of aluminum alloys. Therefore, in order to achieve accurate simulation of HSRF process, a panoramic description of the SRS variation and related mechanisms are required within wide ranges. To address this problem, taking 5A06 aluminum alloy as an example, three distinct SRS zones were determined at 0.001Â sâ1-5000Â sâ1 in the present work, including quasi-static negative SRS zone (Zone-I), positive SRS zone at dynamic strain rate (Zone-II) and negative SRS zone at high strain and strain rate (Zone-III). Then, the mechanism for that in Zone-II is attributed to the conversion from dislocation glide to viscous drag through thermal activation analysis. In Zone-III, the dominant mechanisms are the change of dislocation configuration from dislocation cells and dislocation bands to subgrains in adiabatic shear bands in compression and to the increasing volume fraction of voids in tension, respectively, which is proved by SEM and TEM observations. Consequently, the effect of dislocation evolution on the SRS was quantitatively characterized and the nonlinear rate dependent stress responses of the aluminum alloy in a wide strain rate range were captured.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 688, Part A, 15 December 2016, Pages 776-786
Journal: Journal of Alloys and Compounds - Volume 688, Part A, 15 December 2016, Pages 776-786
نویسندگان
S.L. Yan, H. Yang, H.W. Li, X. Yao,