When aluminum is hit, you can see a dent. Composites, though, spring back to the original shape, which could hide internal damage.
但是也有一个很大的缺点：当铝被撞击时，你会看到一个凹陷，但是复合材料看似能够变回原来的外表，内部却已经受损。
It may be concluded that tensile fracture is caused by the combined effects of surface and internal damage.
指出拉伸断裂是表面与内部损伤共同作用的结果。
Meanwhile, sporadic acoustic emission signals are detected in the high stress stage for the high extent of internal damage.
在高水平时，由于岩石内部损伤程度高，有零星声发射信号产生。
When aluminum is hit, you can see a dent. Composites, though, spring back to the original shape, which could hide internal damage.
当铝受到撞击时会出现明显凹痕，而复合材料则会自动回复原来形状，使它所受的损伤难以察觉。
When the component is installed on an airplane, this internal damage can lead to crack initiation and propagation, resulting in component fracture.
如果把这样的部件安装在飞机上，其内部损伤会导致裂纹并扩展，最终造成部件断裂。
CONTROLLED COOLING: Process by which steel is cooled from an elevated temperature in a predetermined manner to avoid excessive hardening, cracking or internal damage.
强制冷却：将高温钢材强制冷却到设计温度的工序，可防止钢材硬化过度，破裂或者内部损伤。
CONTROLLED COOLING: Process by which steel is cooled from an elevated temperature in a predetermined manner to avoid excessive hardening, cracking or internal damage.
强制冷却：将高温钢材强制冷却到设计温度的工序，可防止钢材硬化过度，破裂或者内部损伤。
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