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在现行的《材料力学》教材中,均在绪论中说明材料力学研究对象是杆件,但在讲授例题和习题时却往往忽略这一原则。同时,教材中对杆件的定义也很笼统,如“杆件——一个方向的尺寸远大于另外两个方向的尺寸,即长度远大于横向尺寸。”长度和横向尺寸之间量的关系几乎所有的《材料力学》教材中都没有明确的给出。而且在许多教材的习题中有些横向尺寸几乎等于长度尺寸,这样就无形中扩大了材料力学的应用范围。由
In the current “Material Mechanics” teaching materials, are introduced in the introduction of material mechanics research object is a lever, but in teaching examples and exercises are often ignored when the principle. At the same time, the teaching of the definition of the rod is also very general, such as “rod - the size of one direction is much larger than the size of the other two directions, the length is much larger than the horizontal size.” The relationship between the length and the horizontal size almost All “material mechanics” textbooks are not explicitly given. And in many textbook exercises some lateral dimensions are almost equal to the length dimension, thus virtually expanding the field of material mechanics. by