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     The results showed that the sharply changed point of U-Z and ε x was the instability point of the sheet,and the instability load was 7780N.
     结果表明 :UZ 和εx 急剧变化的突发点为起皱的失稳点 ,拉伸失稳的临界载荷为 7780牛顿。
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     The problems about grain are paid more and more close attention to the Wholeworld.
     问题。
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     Nonparametric statistical method of change-point to analyze traffic flow breakdown
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  point of attack
The study of the motor and sensory propagation velocity indicates that a widespread functional lesion of the axon with a peripheral point of attack and secondary demyelination, may be the basic pathogenetic event of uremic polyneuropathy.
      
to remove hydrogen from coniferyl alcohol, the point of attack being the phenol group.
      
These properties of anti-aggregating agents combine a favorable pattern of effects with a platelet-specific point of attack.
      
An analysis of this phenomenon has shown, that the point of attack, responsible for the Vulpian-effect, has to be located in the region of the motor end-plate (or near the endplate region in the final terminations of the nerves).
      
Alternatively, if the intracisternal storage is caused in principle by only one of these mechanisms, one has to postulate variations of the specific point of attack.
      
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Based on elastic-plastic thin shell instability theory,adopted virtual power principle and nonlinear elastic-plastic finite element analysis,the buckling characteristic of Al-Mg-Si based alloy Square Sheet with Non-uniform Tension(called as YBT) were investigated.The instability criterion and stress,strain field were gained.The results showed that the sharply changed point of U-Z and ε x was the instability point of the sheet,and the instability load was 7780N.Bifurcation would occur when the tensile force...

Based on elastic-plastic thin shell instability theory,adopted virtual power principle and nonlinear elastic-plastic finite element analysis,the buckling characteristic of Al-Mg-Si based alloy Square Sheet with Non-uniform Tension(called as YBT) were investigated.The instability criterion and stress,strain field were gained.The results showed that the sharply changed point of U-Z and ε x was the instability point of the sheet,and the instability load was 7780N.Bifurcation would occur when the tensile force was up to 7780N,and the sheet would wrinkle when drawn continuously.The distribution of the ε x and the σ x was non-uniform,and the maximum both appeared in the center of the sheet.The transverse compress stress in the center of the square sheet could be considered as the instability eigenvalue of YBT model.

基于弹塑性板壳失稳理论 ,采用虚功原理和非线性弹塑性有限元方法 ,模拟了Al Mg Si基合金方板对角拉伸的皱曲特性 ,得出了方板临界失稳的物理判据和临界状态下的应力、应变场。结果表明 :UZ 和εx 急剧变化的突发点为起皱的失稳点 ,拉伸失稳的临界载荷为 7780牛顿。拉伸载荷达临界载荷前表现为面内变形 ,达临界载荷时方板发生分叉失稳。继续拉伸 ,演变成起皱带。临界状态下横向应变和横向应力的分布不均匀 ,最大值都发生在方板中心。可把失稳状态下方板中心点的横向压应力作为描述YBT模型皱曲失稳的特征值

 
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