老化初期， 结晶为主导因素，它增加杨氏模量、最大拉伸应力，但使材料变脆，降低冲击强度；
It increased the Youngs modulus and the maximum tensile stress but it became brittle and decreased the impact strength.
冲击设备(7)向波导(21)提供撞击脉冲，在波导中产生压缩应力波和反射的拉伸应力波，应力波在波导中传播。
A percussion device (7) gives impact pulses to a waveguide (21), where a compression stress wave and a reflected tensile stress wave are generated, which propagate in the waveguide.
就样品中呈现三角形脉冲的平板冲击实验而言，样品中可以存在一些高拉伸应力区域并发生多次层裂。
Experimental techniques based on the dynamics of shock wave attenuation were used to produce decaying triangular shock pulse in LY12 Al samples of plate-impact spall tests.
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