1、

An improved 3-D 20-node isoparametric singular element with quater-points and displacement method are used to calculate SIF KI and its variation and distribution for inside corner crack of nozzle. The relationships between K I and geometric parameters of crack and structure are analyzed.

用改进的1/4边中节点三维20节点等参奇异元和位移法计算了球接管内壁角裂纹的应力强度因子K1及其变化分布规律,分析了K1与裂纹及结构的几何参数关系。

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2、

Integral transforms and dislocation density functions were employed to reduce the problem to Cauchy singular integral equations. The numerical results show the effects of loading combination parameter, material distribution and crack configuration on the fracture behavior.

数值方法为采用积分变换和位错函数法将问题简化为Cauchy奇异积分方程,最后给出数值结果,讨论了载荷耦合参数、材料分布形式和裂纹位置等因素对断裂行为的影响。

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3、

radar target recognition based on instantaneous polarization time-frequency distribution and singular values feature extraction

基于瞬态极化时频分布及奇异值特征提取的雷达目标识别

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