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中外许多弹性力学书,往往通过例题和习题,将楔形体在某种受力下的应力分布与材料力学的结果(例题中一般指的是等截面梁)加以比较,得出剪应力分布截然不同的结论。这样的对比能说明什么问题呢?如果是为了说明不同解法所得结果的差别,那倒可能引起读者的误解(例如会使人觉得材料力学的结果太不准确了!),而不能说明材力解与弹力解的不同。因为弹性力学解得等截面梁的剪应力也一样和楔形体大不相同!如果是为
Many Chinese and foreign books on elastic mechanics often compare the stress distribution of a wedge under a certain stress with the result of material mechanics (in the example, it is generally referred to as an equal section beam) through examples and exercises. The shear stress distribution is different. The conclusion. This comparison can explain what the problem is? If it is to illustrate the difference in the results of different solutions, it may lead to misunderstandings of the reader (for example, it will make people feel that the results of the mechanical mechanics are too inaccurate!), but can not explain the solution Different from the elastic solution. Because the elastic mechanics solves the same shear stress of the cross-section beam, it is also different from the wedge body! If it is