ASTM D785塑料和电绝缘材料洛氏硬度的标准试验方法
日期:2012-02-08 10:25
ion 12) yields the indentation of the indenter into the specimen after a 15-s application of the major load while the load is still applied. Each Rockwell scale division represents 0.002-mm [0.00008-in.] vertical movement of the indenter. In practice, the Rockwell hardness number is derived from the following relationship:
where:
HR
=
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