泊松比
From Wikipedia, the free encyclopedia
From Wikipedia, the free encyclopedia
泊松比(英语:Poisson's ratio),以法国科学家泊松命名,是材料力学搭弹性力学里向个名词,定义是材料受拉伸或压缩力辰光,材料会发生变形,而其横向变形量搭纵向变形量个比值,是隻无量纲量个物理量。
当材料来勒一隻方向畀压缩个辰光,伊会得来勒跟伊垂直个另外两隻方向伸长,箇就是泊松现象,泊松比是用来反映泊松现象个无量纲个物理量。泊松比一般是正值,表示来勒一方向拉伸後,其他方向会得收縮,弗過也有泊松比為零甚至為負个材料。能量法好算出泊松比个范围是(-1,0.5]。[1]
来勒均匀各向同性材料當中,剪切模量G、杨氏模量E搭仔泊松比三个量當中只有两隻是独立个,存在下头箇隻关系:
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