与其它导电金属层相比，镀铜层具有应力小、机械强度高、塑料基体与镀层结合力好等特点。

Compared with other conductive metal layer, copper coating with small with stress, high mechanical strength, the plastics substrate and coating binding force is good wait for a characteristic.

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残余压应力使缺口处裂纹闭合力增大甚至可出现非扩展裂纹。

Compressive residual stress increases the crack closure effect at the notch and may lead to a non-propagating crack.

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应力峰值亦与牙合力平均值的大小成正相关关系。

So was the strongest stress and the average value of the occlusal force.

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