泊松比 泊松式比(英语:Poisson's ratio),又译泊松比,以法国科学家泊松命名,是材料力学和弹性力学中的名词,定义为材料受拉伸或压缩力时,材料会发生变形,而其横向应变与纵向应变的比率,是一无量纲的物理量。 当材料在一个方向被压缩,它会在与该方向垂直的另外两个方向伸长,这就是泊松现象,泊松比是用来反映泊松现象的无量纲的物理量。泊松比一般是正值,表示在一方向拉伸后,在其他方向收缩。不过也存在泊松比为零(在一方向拉伸后,在其他方向的尺寸不变),其至为负的材料(在一方向拉伸后,在其他方向的尺寸膨胀,拉胀材料)[1]在均匀等向性材料中,剪切模量G、杨氏模量E 和泊松比 ν {\displaystyle \nu } 三个量中只有两个是独立的,它们之间存在以下关系: G = E 2 ( 1 + ν ) {\displaystyle G={\frac {E}{2(1+\nu )}}} 参考资料 ^ Nana Ho. 柚子帽是真的!BMW 參考柚子皮結構做防護配件,保護性能提升 20%. 科技新报. 2017-10-04 [2019-08-08]. (原始内容存档于2019-08-07). 相关条目 弹性力学 胡克定律 脉冲激振法(英语:Impulse excitation technique) 正交各向异性(英语:Orthotropic material) 剪切模量 杨氏模量 热胀冷缩换算公式 均质各向同性线弹性材料具有独特的弹性性质,因此知道弹性模量中的任意两种,就可由下列换算公式求出其他所有的弹性模量。 ( λ , G ) {\displaystyle (\lambda ,\,G)} ( E , G ) {\displaystyle (E,\,G)} ( K , λ ) {\displaystyle (K,\,\lambda )} ( K , G ) {\displaystyle (K,\,G)} ( λ , ν ) {\displaystyle (\lambda ,\,\nu )} ( G , ν ) {\displaystyle (G,\,\nu )} ( E , ν ) {\displaystyle (E,\,\nu )} ( K , ν ) {\displaystyle (K,\,\nu )} ( K , E ) {\displaystyle (K,\,E)} ( M , G ) {\displaystyle (M,\,G)} K = {\displaystyle K=\,} λ + 2 G 3 {\displaystyle \lambda +{\tfrac {2G}{3}}} E G 3 ( 3 G − E ) {\displaystyle {\tfrac {EG}{3(3G-E)}}} λ ( 1 + ν ) 3 ν {\displaystyle {\tfrac {\lambda (1+\nu )}{3\nu }}} 2 G ( 1 + ν ) 3 ( 1 − 2 ν ) {\displaystyle {\tfrac {2G(1+\nu )}{3(1-2\nu )}}} E 3 ( 1 − 2 ν ) {\displaystyle {\tfrac {E}{3(1-2\nu )}}} M − 4 G 3 {\displaystyle M-{\tfrac {4G}{3}}} E = {\displaystyle E=\,} G ( 3 λ + 2 G ) λ + G {\displaystyle {\tfrac {G(3\lambda +2G)}{\lambda +G}}} 9 K ( K − λ ) 3 K − λ {\displaystyle {\tfrac {9K(K-\lambda )}{3K-\lambda }}} 9 K G 3 K + G {\displaystyle {\tfrac {9KG}{3K+G}}} λ ( 1 + ν ) ( 1 − 2 ν ) ν {\displaystyle {\tfrac {\lambda (1+\nu )(1-2\nu )}{\nu }}} 2 G ( 1 + ν ) {\displaystyle 2G(1+\nu )\,} 3 K ( 1 − 2 ν ) {\displaystyle 3K(1-2\nu )\,} G ( 3 M − 4 G ) M − G {\displaystyle {\tfrac {G(3M-4G)}{M-G}}} λ = {\displaystyle \lambda =\,} G ( E − 2 G ) 3 G − E {\displaystyle {\tfrac {G(E-2G)}{3G-E}}} K − 2 G 3 {\displaystyle K-{\tfrac {2G}{3}}} 2 G ν 1 − 2 ν {\displaystyle {\tfrac {2G\nu }{1-2\nu }}} E ν ( 1 + ν ) ( 1 − 2 ν ) {\displaystyle {\tfrac {E\nu }{(1+\nu )(1-2\nu )}}} 3 K ν 1 + ν {\displaystyle {\tfrac {3K\nu }{1+\nu }}} 3 K ( 3 K − E ) 9 K − E {\displaystyle {\tfrac {3K(3K-E)}{9K-E}}} M − 2 G {\displaystyle M-2G\,} G = {\displaystyle G=\,} 3 ( K − λ ) 2 {\displaystyle {\tfrac {3(K-\lambda )}{2}}} λ ( 1 − 2 ν ) 2 ν {\displaystyle {\tfrac {\lambda (1-2\nu )}{2\nu }}} E 2 ( 1 + ν ) {\displaystyle {\tfrac {E}{2(1+\nu )}}} 3 K ( 1 − 2 ν ) 2 ( 1 + ν ) {\displaystyle {\tfrac {3K(1-2\nu )}{2(1+\nu )}}} 3 K E 9 K − E {\displaystyle {\tfrac {3KE}{9K-E}}} ν = {\displaystyle \nu =\,} λ 2 ( λ + G ) {\displaystyle {\tfrac {\lambda }{2(\lambda +G)}}} E 2 G − 1 {\displaystyle {\tfrac {E}{2G}}-1} λ 3 K − λ {\displaystyle {\tfrac {\lambda }{3K-\lambda }}} 3 K − 2 G 2 ( 3 K + G ) {\displaystyle {\tfrac {3K-2G}{2(3K+G)}}} 3 K − E 6 K {\displaystyle {\tfrac {3K-E}{6K}}} M − 2 G 2 M − 2 G {\displaystyle {\tfrac {M-2G}{2M-2G}}} M = {\displaystyle M=\,} λ + 2 G {\displaystyle \lambda +2G\,} G ( 4 G − E ) 3 G − E {\displaystyle {\tfrac {G(4G-E)}{3G-E}}} 3 K − 2 λ {\displaystyle 3K-2\lambda \,} K + 4 G 3 {\displaystyle K+{\tfrac {4G}{3}}} λ ( 1 − ν ) ν {\displaystyle {\tfrac {\lambda (1-\nu )}{\nu }}} 2 G ( 1 − ν ) 1 − 2 ν {\displaystyle {\tfrac {2G(1-\nu )}{1-2\nu }}} E ( 1 − ν ) ( 1 + ν ) ( 1 − 2 ν ) {\displaystyle {\tfrac {E(1-\nu )}{(1+\nu )(1-2\nu )}}} 3 K ( 1 − ν ) 1 + ν {\displaystyle {\tfrac {3K(1-\nu )}{1+\nu }}} 3 K ( 3 K + E ) 9 K − E {\displaystyle {\tfrac {3K(3K+E)}{9K-E}}}