论文部分内容阅读
强度强度表示一种物体坚固不坚固,容易不容易被外力破坏。我们知道:拉断一根粗的木棒比拉断一根细的木棒困难得多;在厚铁板上冲一个孔比在薄铁板上冲一个孔困难得多。这说明某一种物体坚固不坚固同它的受力面积有密切的关系。我们在比较不同物体的强度的时候,都是拿一定的面积(单位面积)来作计算的标准的。例如,断面面积1平方毫米的物体能够承受多大的外力不致被破坏(再大
Strength of an object that is not strong solid, easy to not easily be destroyed by external forces. We know that it is much more difficult to break a thick stick than to pull a thin stick; it is more difficult to punch a hole in a thicker plate than to punch a hole in a thin plate. This shows that a solid object is not strong and its force area is closely related. When we compare the intensity of different objects, we take a certain area (unit area) to calculate the standard. For example, the cross-sectional area of 1 square millimeters of the object can withstand much external force will not be destroyed