本研究主要探討電源供應器外殼使用鋼球進行球擊測試，並使用有限元素法模擬軟體(ABAQUS)進行球擊模擬的研究，利用顯示分析(Explicit)方法建立球擊模擬的模型進行電源供應器外殼的破壞評估。由於要在球擊模擬裡直接分析獲得破壞的現象非常困難，本研究使用能量的方法判斷電源供應器外殼是否達到破壞配合電源供應器外殼材料拉伸試驗數據，分析外殼材料所能承受的臨界應變能密度。利用拉伸試驗模擬材料破壞所累積的應變能密度值配合臨界應變能密度驗證有限元素法模擬軟體破壞機制的準則，再把結果應用在正面球擊模擬。使用0.5公斤鋼球進行正面球擊模擬，評估在5到6公尺之間是否會發生破壞；使用1公斤鋼球進行正面球擊模擬，評估在2.5到3公尺之間是否會發生破壞。正面球擊實驗由於實驗設備的限制，無法在2公尺高度以上進行外殼球擊實驗，因此決定把電源供應器外殼轉至側面進行球擊測試並加上經過超音波熔接的底座進行側面球擊實驗。進行模擬與實驗的比較後，評估側面球擊模擬需要把臨界應變能密度除2來做為破壞臨界值。最後再比較正面球擊模擬與側面球擊模擬結果，分析電源供應器外殼在不同邊界條件下的結構強度。

This study aims to conduct the ball impact test of the power supply shell and uses the ABAQUS finite element analysis (FEA) software to research on ball impact simulation. The failure of the power supply shell is evaluated based on explicit method in ABAQUS for ball impact. Since it is very difficult to directly simulate the failure in the ball impact, the energy method is adopted to evaluate material failure of the power supply shell in this study. Using the shell material tensile test data, the critical strain energy density of the power supply shell material is then determined. Results of the tensile test simulation are used to verify FEA results based on the energy analysis for the ball impact. Using a 0.5 kg steel ball for the frontal ball impact, failure is found to occur between 5 and 6 meters; using a 1 kg steel ball for the frontal ball impact, failure is found to occur between 2.5 and 3 meters. Since the ball impact test cannot exceed 2-meter height due to the limit of the experimental equipment, we decide to turn the power supply shell to the side by adding a base which has been welded on shell bottom by ultrasonic welding. After comparing the simulation results and experimental results for the side ball impact, the critical strain energy density is determined to reduce by half as the failure critical value. Finally, the results of the front ball impact and the side ball impact are compared and the structural strength of the power supply shell under different boundary conditions is also evaluated.

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