Johnson-Cook材料模型参数的实验测定

介绍了一种通过Hopkinson拉伸实验、圆筒爆炸试验和计算机仿真来确定Johnson-Cook材料模型中相关常数的方法。

Prediction of structural dynamic plastic shear failure by Johnson's damage number

It is proved that Johnson's damage number is the sole similarity parameter for dynamic plastic shear failure of structures loaded impulsively, therefore, dynamic plastic shear failure can be understood when damage number reaches a critical value. It is suggested that the damage number be generally used to predict the dynamic plastic shear failure of structures under various kinds of dynamic loads (impulsive loading, rectangular pressure pulse, exponential pressure pulse, etc.,). One of the advantages for using the damage number to predict such kind of failure is that it is conveniently used for dissimilar material modeling.

Johnson-Segalman流体剪切流动的相平面分析与数值模拟

研究Johnson-Segalman流体的剪切流动行为.首先分析该模型的定常解,从稳定的总剪切应力曲线上可见,当稳定总剪切应力T取值足够大或足够小时,方程有惟一定常解;当T取中间值时,方程定常解不惟一.最后,采用向后差分格式对该模型进行数值模拟.