[求助] 弹性模量与硬度有什么关系？

Although diamond, with the highest known hardness (70 to 100 GPa), has traditionally been used to fulfill many of these needs, there are limits to its applicability. For example, diamond is not used to cut steel and other ferrous metals because of the detrimental formation of iron carbide during high-speed machining. Therefore, there is a need for synthetic materials that can be used in place of diamond. Cubic boron nitride (BN), the second hardest material (45 to 50 GPa), is used to cut steel because iron borides and nitrides are much less stable.

Originally posted by stractor at 2011-04-29 22:55:35:
是体积模量吧？

Originally posted by acridine at 2011-04-30 16:59:13:
硬度的定义本身就很复杂，在实验上有不同的定义方法以及测试方法。
其单位是GPa也可以没什么难以理解的吧，就是材料所能扛住的最大应力呗
GPa既可以是应力的单位，也可以是应力/应变（模量）的单位。

6楼: Originally posted by Panyupeng at 2014-11-10 10:13:46
弹性模量指应力与应变的比值（应变是在受到外力作用下，产生的形变），所以应力越大，应变越小，弹性模量越大，性能越好；硬度是自身性质。两者没直接关系，当然在工业应用方面，两者均越大越好