含固体颗粒介质的密封装置，常常因固体颗粒进入密封装置引起密封表面破坏。
For the surface of seal for powder medium was often damaged by solid particles, the improvement on common seal was made.
本文主要介绍用侧面观测法测量精磨玻璃表面破坏层深度的试件制做、测试仪器；
The test pieces and instrument for side- testing method to measure the depth of destructive layer of fine- ground glass surface are mainly introduced.
一组叫做表面破坏模式的S-N曲线，它发生在高应力幅短寿命区，是由试样表面晶体滑移引起的。
One is called the S-N curve of surface fracture mode. It is governed by a crystal slip on the specimen surface, which occurs in the region of short fatigue life and high stress amplitude level.
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