什么是多次冲击抗力理论?许多机械产品不仅粗大笨重,浪费材料,而且效率低,寿命短。究其原因,除了结构设计和制造工艺方面的问题外,关键就在于使用的材料强度水平一般都比较低。为什么使用的材料强度较低呢?原来在机械产品的强度设计中,过去一直迷信一种洋教条:认为制造零件的材料,除应保证一定强度外,冲击韧度愈高愈能保证安全,所以总是依冲击韧度为强度设计的准绳。在多次情况下,要使金属材料经过加工处理后达到规定的冲击韧度,强度就很 What is the multiple impact resistance theory? Many mechanical products are not only heavy bulky, waste materials, and low efficiency, short life expectancy. The reason, in addition to structural design and manufacturing process problems, the key is that the material used in the level of strength are generally relatively low. Why the lower strength of the material used? Originally in the mechanical strength of the product design, the past has been superstitious a foreign dogma: that the manufacture of parts materials, in addition to ensure a certain strength, the higher the impact toughness, the more you can ensure safety, so Always follow the toughness of impact toughness design criteria. In many cases, to make the metal material after processing to achieve the required impact toughness, strength is very