综合分析了阀片的失效原因、机理，并进行了对阀片边缘实施滚磨倒角来提高其疲劳寿命的实验研究。
The cause and mechanism of valve failure are analyzed, and the method of tumbling chamfer is studied to improve service life of the valves.
用工程断裂力学研究了非金属夹杂物尺寸对阀片疲劳寿命的影响。
An investigation has been made on the influence of the dimension of non-metallic inclusions on valve fatigue life according to engineering fracture mechanics.
结果表明，复合材料补片胶接修补能有效地提高裂纹板的破坏强度和刚度，降低裂纹板的疲劳裂纹扩展速率，提高其疲劳寿命。
The effectiveness of the repair scheme, including the tensile strength, the fatigue life and the crack progress during fatigue was investigated experimentally.
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