在ABAQUS软件中,建立了板级TSOP(thin small outline package)封装跌落/冲击问题的三维有限元模型。采用速度载荷法,研究了PCB(printedcircuitboard)、芯片引脚等的动力学响应,分析了不同支撑条件对仿真结果的影响,并结合板级TSOP封装...在ABAQUS软件中,建立了板级TSOP(thin small outline package)封装跌落/冲击问题的三维有限元模型。采用速度载荷法,研究了PCB(printedcircuitboard)、芯片引脚等的动力学响应,分析了不同支撑条件对仿真结果的影响,并结合板级TSOP封装跌落破坏实验对TSOP封装芯片的焊点失效机理进行了研究。实验结果表明,芯片的惯性力和芯片安装部位PCB的弯曲变形对焊点应力都有较大影响,焊点应力峰值出现在冲击后2ms到3ms之间,这与PCB跌落变形过程中中心部位和碰撞面"二次碰撞"所产生的芯片安装部位弯曲变形密切相关,TSOP封装芯片引脚部位的瞬时拉应力和剪切应力是导致焊点失效的主要原因。展开更多
Marine pipeline damage subjected to dropped objects from platforms or supply vessels is analyzed to introduce an easy and applicable approach to investigating the damage induced by impact load from drop weight. A prac...Marine pipeline damage subjected to dropped objects from platforms or supply vessels is analyzed to introduce an easy and applicable approach to investigating the damage induced by impact load from drop weight. A practical engineering example was presented and analyzed using the commercial program 'ANSYS/LS-DYNA', which is a powerful tool with an explicit dynamic solver. And rational agreement of the results with previous works was obtained. The suggested procedure might be taken as a checking analysis of the protection measures of pipelines in addition to the general risk assessment method.展开更多
文摘在ABAQUS软件中,建立了板级TSOP(thin small outline package)封装跌落/冲击问题的三维有限元模型。采用速度载荷法,研究了PCB(printedcircuitboard)、芯片引脚等的动力学响应,分析了不同支撑条件对仿真结果的影响,并结合板级TSOP封装跌落破坏实验对TSOP封装芯片的焊点失效机理进行了研究。实验结果表明,芯片的惯性力和芯片安装部位PCB的弯曲变形对焊点应力都有较大影响,焊点应力峰值出现在冲击后2ms到3ms之间,这与PCB跌落变形过程中中心部位和碰撞面"二次碰撞"所产生的芯片安装部位弯曲变形密切相关,TSOP封装芯片引脚部位的瞬时拉应力和剪切应力是导致焊点失效的主要原因。
文摘Marine pipeline damage subjected to dropped objects from platforms or supply vessels is analyzed to introduce an easy and applicable approach to investigating the damage induced by impact load from drop weight. A practical engineering example was presented and analyzed using the commercial program 'ANSYS/LS-DYNA', which is a powerful tool with an explicit dynamic solver. And rational agreement of the results with previous works was obtained. The suggested procedure might be taken as a checking analysis of the protection measures of pipelines in addition to the general risk assessment method.
