塑料 硬度测定 第2部分:邵氏硬度

[中文适用范围]： 采用洛氏硬度计使用洛氏 M、L 和 R 硬度标尺测定塑料压痕硬度的方法规范。 洛氏硬度值源自压痕深度的净增加，因为压头上的负载从固定的次要负载增加到主要负载，然后返回到相同的次要负载。 对于具有高蠕变和恢复的材料，施加主要和次要载荷所涉及的时间因素对测量结果有相当大的影响。 [外文原描述]： Specifications of a method for the determination of the indentation hardness of plastics by means of the Rockwell hardness tester using the Rockwell M, L and R hardness scales. The Rockwell hardness number is derived from the net increase in depth of impression as the load on an indentor is increased from a fixed minor load to a major load and then returned to the same minor load. For materials having high creep and recovery, the time-factors involved in application of the major and minor loads have a considerable effect on the results of the measurements.