normal stress difference in Chinese

• 法向应力差

• "normal" in Chinese :    adj. 1.正常的，平常的，普通的；平均的。 2.正规 ...
• "stress" in Chinese :    n. 1.压力，压迫，紧迫，紧张。 2.【语音】重音；重 ...
• "difference" in Chinese :    n. 1.差异，差别。 2.不和，争论。 3.【数学】差 ...
• "first normal stress difference" in Chinese :    第一正应力差
• "first normal-stress difference" in Chinese :    第一法向应力差
• "second normal-stress difference" in Chinese :    第二法向应力差
• "stress difference" in Chinese :    应力差
• "normal stress" in Chinese :    正法向应力; 正力; 正胁强; 正应力；正向应力
• "stress; normal" in Chinese :    法向应力
• "stress-difference line" in Chinese :    应力差
• "thermal (temperature difference) stress" in Chinese :    温差应力
• "first normal-stre difference" in Chinese :    第一法向应力差
• "second normal-stre difference" in Chinese :    第二法向应力差
• "additional normal stress" in Chinese :    附加正应力
• "angular normal stress" in Chinese :    角向正应力

• 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
  对于fr4基板，在固化过程中，芯片表面的剪切应力和正应力的值很小，其数值在原点上下很窄的范围内波动。在降温过程中，热膨胀系数的失配随着温度的降低而越来越显著，引起应力的积聚。
• 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
  在冷却过程中某些局域正应力差的变化规律为：该差值从正值变到负值再回到正值，呈振荡状态；局域随热循环进行应力将急剧增加，即处于应力相对集中的状态，这样的区域是芯片易于失效的区域。