纸的承受能力竟然是如此之大
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细推物理须行乐 何用浮名绊此身
前几天，强人王鸿飞和我们讨论了一个奇特的现象。
大家都认为，纸是很脆弱的，但事实上纸的承受能力惊人的大，不信你可以做个实验看看。
拿一张没有褶皱没有裂缝的纸，双手握住纸的两边（注意是握住，而不是用指头捏住或掐住，目的是尽量减小纸在手处的扭曲形变），使劲用力拉纸，无论你用多大的力气你也不可能把纸从中间拉断。纸就算断了，也一定是从你的手那里断的，那里发生了扭曲形变。
神奇吧！分子力就是这么神奇，物理就是这么神奇！
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餐巾纸呢？
哦，褶皱。
纸卷确实很结实，卷成卷不容易撕裂，承受拉力方面和不卷应该是基本一样的。
那为什么有褶皱有裂缝就不行呢，怎样用理论解释这一点？