有趣的试验一个机械制造厂的工程师在设计一种压力机。原来设计,床身主板需要用120毫米厚的钢板来制造。但是,这样厚的钢板当时难以买到。工程师想将主板减薄20毫米,改用100毫米厚的钢板来制造,又担心压力机制造出来以后,在工作中主板会受不了,便委托一个科学研究部门作一种有趣的试验(图1)。要知道主板在工作中是否受得了外力——载荷,实际上也就是要预先搞清楚在工作中它内部的应力分布的可能情况。外力作用到材料 An interesting test engineer at a mechanical manufacturing plant is designing a press. Originally designed, the bed body board needed to be manufactured with 120 mm thick steel plates. However, such thick steel plates were difficult to buy at the time. The engineer wanted to reduce the thickness of the main board by 20mm to 100mm thick steel plate. After worrying about the manufacturing of the press, the mainboard would not be able to stand the work, and he commissioned a scientific research department to do an interesting experiment (Figure 1). ). To know whether the mainboard is subjected to external forces—loads—in fact, it is necessary to preliminarily figure out the possible internal stress distribution in the work. External force applied to the material