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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