无铅焊点热疲劳状态估计  

Estimation of Thermal Fatigue State of Lead-Free Solders

作　　者：毛书勤[1,2] 刘剑[1] 陈媛[1] 

机构地区：[1]中国科学院长春光学精密机械与物理研究所,长春130031 [2]中国科学院大学,北京100039

出　　处：《宇航材料工艺》2015年第3期15-18,共4页Aerospace Materials & Technology

基　　金：吉林省科技发展计划项目(20126016)

摘　　要：为获取元器件焊点的热疲劳状态信息,采用了焊点剪切力测试方法和非线性最小二乘数据拟合法。以1210片式电阻器件无铅焊点为研究对象,开展了剪切力-热疲劳状态试验研究工作。依据0、300、600、900、1200、1 500个周期温度冲击下的焊点剪切力试验数据,采用非线性最小二乘的Gauss-Newton法,并利用Matlab编程的手段获取了剪切力数据的拟合曲线。以"剪切力值下降30%"的失效标准划定失效界线,利用拟合曲线推算出焊点失效时的循环周期数为1 439.04。试验证明焊点剪切力能够反映出焊点的热疲劳状态,该方法可用于焊点的疲劳状态监测、估计,满足对于焊点疲劳状态的监测需要,同样适用于其他类型焊点的疲劳状态估计。In order to get solder information of thermal fatigue state, shear force test method and nonlinear least square method are used. A lead-free solder joint with 1210 chip resistor is the research object. A solder joint thermal fatigue life prediction method based on the solder joint shear strength test is put forward. The test of shear force-ther- mal fatigue life is done. According to 0, 300, 600, 900, 600, 1500 cycle data, Gauss-Newton of nonlinear least square method is used to fit curves based on Matlab programming. By using the shear force value fell by 30% failure criteria defined, the solder joint failure cycle number is 1439.04. The method can be used to solder joint shear strength of solder joint fatigue state monitoring, estimates, the same to the other kinds of solders.

关 键 词：片式元件焊点 热疲劳状态 剪切力 Gauss-Newton法 

分 类 号：TG4[金属学及工艺—焊接]