关于各向同性材料的泊松比的下限问题,已经争论了许多年。多数人认为是0,少数人认为是-1。他们在理论推导上往往出错,而且一直找不到泊松比为负的实物。王启宏教授从理论上作了分析, The issue of the lower limit of Poisson’s ratio for isotropic materials has been debated for many years. Most people think that it is 0, and a few people think it is -1. They often make mistakes in theoretical derivation, and they have never found a Poisson’s ratio negative. Professor Wang Qihong made a theoretical analysis.