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中文摘要：
进行了4组加速度的功率谱密度（PSD）条件下的焊点疲劳寿命试验,采用比例风险模型（PHM）分析加速度的PSD对焊点寿命的影响,并采用估计所得寿命期望（MTTF）,结合Miner准则得到板极无铅焊点随机振动寿命损伤累积模型.结果表明：焊点疲劳寿命试验的结果与PHM估计所得焊点寿命的MTTF及其失效概率密度（PDF）吻合较好;当输入加速度的PSD幅值大于60 m2/s3时,焊点的MTTF值小于1 800 s,表明无铅焊点对随机振动载荷非常敏感.
英文摘要：
Four groups of random vibration tests of solder joints were conducted with different power spectral density（PSD） of in-put acceleration.Proportional hazards model（PHM） was used to evaluate the effect of PSD of in-put acceleration on the solder joints＇ life span.The mean-time-to-failure（MTTF） and the failure probability density function（PDF） estimated from the PHM agree well with the experimental data,and this validates the effectiveness of the PHM.By the curve of the MTTF s,it can be observed that the MTTF1 800 s when the amplitude of PSD was greater than 60 m2/s3,and this demonstrates that the lead-free solder joints are very sensitive to random vibration loading.Finally,the estimated lifetime of MTTF was integrated with the Miner＇s law for cumulative damage model of lead-free solder joints.
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