کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1564339 | 1513958 | 2006 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Breakdown of heterogeneous materials
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
سایر رشته های مهندسی
مکانیک محاسباتی
پیش نمایش صفحه اول مقاله
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چکیده انگلیسی
We discuss the threshold activated extremal dynamics that is prevalent in the breakdown processes in heterogeneous materials. We model such systems by an elastic spring network with random breaking thresholds assigned to the springs. Results are obtained from molecular dynamics simulation of the system under constant stress and constant strain conditions. We find that the distribution P(m) of the avalanches of size m, caused by the rupturing of the springs till the failure of the network, decays as a power-law: P(m) â¼Â mâα, where α can be closely approximated to 5/2. The average avalanche size ãmã diverges as ãmã â¼Â (Fc â F)â1/2 close to the stress Fc at which the total failure of the network occurs. We study the time evolution of the breakdown process: we find that the bonds rupture randomly over the network at initial times but the rupturing becomes highly correlated at late times to give rise to a well-defined macroscopic crack.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Computational Materials Science - Volume 37, Issues 1â2, August 2006, Pages 141-145
Journal: Computational Materials Science - Volume 37, Issues 1â2, August 2006, Pages 141-145
نویسندگان
Purusattam Ray,