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在热力机械合负载下接接头的故障行为和机制

Yuxin Deng^1,2, Si Chen², Peijiang Liu²

¹School of Material and Energy, Guangdong University of Technology, Guangzhou 510006, China.

Materials (Basel, Switzerland)

|February 13, 2026

概括

由于热膨胀不匹配,电子设备面临热疲劳故障. 这项研究通过使用Coffin-Manson模型中的稳定应变来完善寿命预测,提高接关节可靠性的准确性.

科学领域:

材料科学材料科学材料科学
机械工程机械工程
可靠性工程可靠性工程

背景情况:

电子设备经历热循环,导致不同热膨胀系数 (CTE) 的压力.
这种压力导致接接头的循环应变,引发裂并导致互连故障.
Sn3.5Ag接接头是易受热疲劳的关键部件.

研究的目的:

在CTE不匹配下调查Sn3.5Ag接接头的热疲劳失败机制.
提出一种精细的方法来评估使用稳定应变的热疲劳寿命.
为评估接关节可靠性建立更可靠的基础.

主要方法:

利用数值模拟和实验分析.
在接接头-板接口上确定了裂纹启动点.
提取的等效粘性塑性菌株范围从稳定状态歇斯底里反应.
将稳定菌株应用于Coffin-Manson模型进行生命预测.

主要成果:

在关节接口的交替剪切应变度被确定为主要裂纹启动地点.
与暂时方法相比,拟议的方法减轻了压力过高估计.
预计接接头的热疲劳寿命为18930个周期.
在临界点确认了较高的粘性塑料应变能量密度,表明能量消耗驱动损伤.

结论:

支持使用稳定应变用于Coffin-Manson模型应用的假设.
这种精细的方法为热疲劳寿命评估提供了更合理的物理基础.
了解变形,循环反应和能量消耗是可靠接关节寿命评估的关键.

关键词:

疲劳生活疲劳生活接关节的接接关节的接温度循环的温度循环.热力机械合热力机械合

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