The crack will deflect because the weak layer exits, which will absorb more amounts of fracture work and improve the crack tolerance greatly, therefore the fracture toughness increases remarkably.
这是由于弱间层的存在将出现裂纹偏转现象，吸收大量的断裂功，从而大幅度提高了裂纹的扩展容限，使断裂韧性有较大增长。
The concept of essential work of fracture offers a simple and practical way to measure the fracture toughness of a sheet.
介绍了用断裂基功的概念测定纸张断裂韧性的新方法。
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