ball cracked 中文意思是什麼

ball cracked 解釋
球破裂
  • ball : n 鮑爾〈姓氏〉。n 1 球；球狀物。2 球戲，（特指）棒球；【棒球】壞球 （opp strike） 3 【軍事】子彈...
  • cracked : adj. 1. 弄破了的，弄裂了的。2. 嗓子弄啞了的，聲音起了變化的。3. 〈口語〉瘋了的，精神失常的。
  1. Zhang liji ( material physics and chemistry ) directed by professor xie xiaoming this paper is intended to solve problems for those who are designing, using pbgas. failure mechanism, as well as cycles to failure of two groups of pbga samples ( with / without underfill ) for thermal cycling conditions in the range of - 40 ~ 125, were presented. the experiment shows that solder ball in the samples without underfill cracked after 500 times cycle, no crack was found in the underfilled samples even after 2700 cycles

    通過一系列的實驗，得到以下實驗結果： ?在本論文設定的溫度循環條件下，未充膠pbga樣品的熱疲勞品壽命在500周左右，充膠樣品的焊點壽命高於2700周； ?對于未充膠器件，中心距（ dnp ）是決定焊點應力、應變大小的最主要因素，裂紋總是從中心距較大處萌生並向中心處擴展； ?溫度循環的過程中焊盤附近焊料組織明顯粗化。
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