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Summary Psychological stress may be associated with increased risk of fractures. It is unknown whether post-traumatic stress disorder (PTSD), a marker of chronic severe psychological stress occurring in response to a traumatic event, influences fracture risk. In this nationwide cohort study, persons with PTSD had an increased risk of fractures compared to the general population. Introduction We...
In the present study, a novel computational model is proposed to investigate the plastic strain hardening effect of lead-free solder joints in PCB assembly subject to mechanical drops. The test condition is based on JESD22-B111. The dynamic loading is applied using the popular input-G method. The strain hardening properties of various lead-free solders are experimentally characterized and input to...
Cracking of the silicon chip of a wafer level chip scale package (WLCSP) is encountered during a thermal cycle test (TCT). This paper attempts to examine the failure mechanism. Both numerical and experimental efforts were devoted to investigate the problem. A series of finite element models with different combinations of material properties and geometric configurations were developed. The results...
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