峰值载荷前出现了 少数微裂纹,微裂纹的产生与演化主要发生在孔隙周边。
The main cracks appear in the place of densely distributed pores with many minor cracks. Before the peak value, a few minor cracks appear around pores.
而在峰值载荷附近,声发射事件数快速增长且开始有大量高振幅声发射信号出现。
As the load reached the peak, a large number of AE hits occurred and its amplitude was high.
结果表明:在小范围屈服条件下随着中间纯铝层厚度的降低,其峰值载荷呈线性增加;
The results show that, in the condition of small scale yielding (SSY), the peak value of loadings linearly increases with decreasing pure Al sheet thickness.
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