The relation of law of the fatigue crack extending and feature of macro-profile is discovered, which provides a new method for the life estimation of the brake disc.

发现裂纹剖面宏观形貌特征与制动盘疲劳裂纹扩展规律之间存在一定的关联，为制动盘寿命评估提供了新的思路。

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Failure diagnosis of disc spring in transmission of scraper Model CL7 and bench life test for its fatigue life are introduced. Improvement measures in increasing its fatigue life are proposed.

本文介绍了CL7铲运机变速器蝶形弹簧失效原因的分析和台架疲劳寿命试验研究，提出了提高蝶簧疲劳寿命的改进措施。

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