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首页> 外文期刊>International Journal of Damage Mechanics >A unified viscoplastic fatigue damage model for 63Sn-37Pb solder alloy under cyclic stress control
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A unified viscoplastic fatigue damage model for 63Sn-37Pb solder alloy under cyclic stress control

机译：循环应力控制下63Sn-37Pb焊料合金的统一粘塑性疲劳损伤模型

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摘要

A damage coupling viscoplastic model is developed to predict fatigue life of solder alloy 63Sn-37Pb under stress control. The viscoplastic flow rule chosen employs a hyperbolic sine function. A damage evolution equation is formulated based on three distinct material deformation behaviors: (i) stress rate independent damage evolution: (ii) stress rate dependent cyclic damage evolution, and (iii) stress rate dependent ductile damage evolution. The cyclic stress testing with different stress waveforms was first conducted to investigate their progressive viscoplastic deformations of the solder alloy. The investigation reveals that the material constants used in the model can be adequately determined from the results of standard creep tests. The constitutive model is validated by comparing the predicted and measured ratchetting results of the solder alloy tinder different forms of stress cycling. The proposed model is found to be capable of satisfactorily describing the viscoplastic deformation and ratchetting failure behaviors of the solder alloy under the conditions of the cyclic stress loading.
机译：建立了损伤耦合粘塑性模型，以预测在应力控制下63Sn-37Pb焊料合金的疲劳寿命。选择的粘塑性流动规则采用双曲正弦函数。基于三种不同的材料变形行为来制定损伤演化方程：（i）应力速率无关的损伤演化：（ii）应力速率依赖性的循环损伤演化，和（iii）应力速率依赖性的延性损伤演化。首先进行具有不同应力波形的循环应力测试，以研究焊料合金的渐进粘塑性变形。调查表明，可以从标准蠕变测试的结果中充分确定模型中使用的材料常数。通过比较不同形式的应力循环的焊料合金焊点的预测和测量的咬合结果，可以验证本构模型。发现所提出的模型能够令人满意地描述在循环应力载荷条件下焊料合金的粘塑性变形和咬合破坏行为。

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