normal stress difference 中文意思是什麼

normal stress difference 解釋
法向應力差
  • normal : adj 1 正常的,平常的,普通的;平均的。2 正規的,標準的,額定的,規定的。3 智力正常的,精神健全的...
  • stress : n 1 壓力,壓迫,緊迫,緊張。2 【語音】重音;重讀;【詩】揚音;語勢,著重點。3 重要(性),重點,...
  • difference : n. 1. 差異,差別。2. 不和,爭論。3. 【數學】差,差額。4. 【邏輯學】特殊性。vt. 〈罕用語〉區別,使有差別。
  1. It is found during the cooling down in some local region that the normal stress difference varies from positive to negative and then turns positive again. the stress accumulates rapidly in the followed thermal treatment in this region, where the chip - on - board package tends to fail from

    在冷卻過程中某些局域正應力差的變化規律為:該差值從正值變到負值再回到正值,呈振蕩狀態;局域隨熱循環進行應力將急劇增加,即處于應力相對集中的狀態,這樣的區域是晶元易於失效的區域。
  2. Second normal - stress difference

    第二法向應力差
  3. First normal - stress difference

    第一法向應力差
  4. When the substrate is fr4, the surface shear stress and normal stress difference is at a low level and near zero during curing process and build up during cooling down because of the mismatch of ctes of silicon and substrate

    對于fr4基板,在固化過程中,晶元表面的剪切應力和正應力的值很小,其數值在原點上下很窄的范圍內波動。在降溫過程中,熱膨脹系數的失配隨著溫度的降低而越來越顯著,引起應力的積聚。
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