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Fatigue life and plastic deformation behavior of electrodeposited copper thin films

机译：电沉积铜薄膜的疲劳寿命和塑性变形行为

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摘要

Using a commercial, electrodeposited copper film of 12 μm thickness, tensile tests, fatigue tests and static loading tests were performed. The elastic modulus, two types of yield strengths, tensile strength and strain-hardening exponent were obtained. Fatigue tests were performed at four levels of mean stresses and cyclic plastic strain and ratcheting strain (monotonic plastic strain) were measured continuously during the tests. Irrespective of mean stress, fatigue life can be well represented by the maximum stress. The monotonic plastic strain at fracture is nearly constant, irrespective of fatigue life or mean stress. Based on the results obtained, the reason why fatigue life can be well represented by the maximum stress is discussed.
机译：使用市售的12微米厚的电沉积铜膜进行拉伸测试，疲劳测试和静态载荷测试。获得了弹性模量，两种屈服强度，拉伸强度和应变硬化指数。在四个平均应力水平上进行疲劳测试，并在测试过程中连续测量循环塑性应变和棘轮应变（单调塑性应变）。无论平均应力如何，最大寿命都可以很好地代表疲劳寿命。断裂时的单调塑性应变几乎恒定，与疲劳寿命或平均应力无关。基于获得的结果，讨论了疲劳寿命可以由最大应力很好地表示的原因。

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