کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1583143 | 1514884 | 2008 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
High-strain, high-strain-rate flow and failure in PTFE/Al/W granular composites
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Dynamic compression experiments were performed on a pressed PTFE/Al/W mixture to understand the composite behavior at high-strain and high-strain rate. The high-strain-rate tests were carried out in a drop-weight apparatus at impact velocities of 3.5 and 5Â m/s, providing strain rates of approximately 4Â ÃÂ 102Â sâ1. Aluminum jackets of varying thickness were used to ensure that specimens underwent confined deformation but did not separate into fragments. Failure was preceded by extensive plastic deformation concentrated primarily in the PTFE component. W particle-PTFE interface separation provided initiation and propagation of cracks. In extensively deformed specimens (strains of up to â0.875), PTFE nanofibers formed along cracks as a result of shear localization and significant softening caused by plastic deformation. The Zerilli-Armstrong constitutive equation for polymeric solids was used to simulate the response of the composite. Its use is justified by the fact that the majority of plastic strain is concentrated in the PTFE polymer.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: A - Volume 472, Issues 1â2, 15 January 2008, Pages 308-315
Journal: Materials Science and Engineering: A - Volume 472, Issues 1â2, 15 January 2008, Pages 308-315
نویسندگان
J. Cai, S.M. Walley, R.J.A. Hunt, W.G. Proud, V.F. Nesterenko, M.A. Meyers,