A Monte Carlo–shear lag simulation of tensile fracture behaviour of Bi2223 filament
A Monte Carlo–shear lag simulation of tensile fracture behaviour of Bi2223 filament
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DOI：
10.1088/0953-2048/18/12/004
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发表时间：
2005-12
影响因子：
3.6
通讯作者：
Shojiro Ochiai;T. Ishida;D. Doko;K. Morishita;H. Okuda;S. Oh;D. Ha;M. Hojo;M. Tanaka;M. Sugano;K. Osamura
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文献类型：
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作者：
Shojiro Ochiai;T. Ishida;D. Doko;K. Morishita;H. Okuda;S. Oh;D. Ha;M. Hojo;M. Tanaka;M. Sugano;K. Osamura
用蒙特卡罗剪滞模拟方法描述了Bi2223纤维的损伤演化过程及其对临界电流的影响。通过计入单个晶体的横向和纵向破坏模式，有效地模拟了拉伸应变下实验观察到的沿取向Bi2223晶体的锯齿形裂纹扩展。根据模拟的应力-应变曲线，估计了随着外加应变的增加，生存参数(应力-应变曲线相对于原始杨氏模数归一化的斜率)。该参数与临界电流的应变灵敏度相结合，可以很好地描述复合带材的临界电流随外加应变的变化。
The damage evolution in Bi2223 filaments and its influence on critical current was described by a Monte Carlo–shear lag simulation method. The experimentally observed zigzag crack propagation across aligned Bi2223 grains under tensile strain was effectively modelled by including transverse and longitudinal failure modes for individual grains. From the simulated stress–strain curve, the survival parameter (slope of the stress–strain curve normalized with respect to the original Young’s modulus) was estimated with increasing applied strain. With this parameter combined with the strain sensitivity of the critical current, the measured change of critical current of the composite tape with applied strain could be described well.