某机器人装备聚氨酯管发生开裂,采用宏观观察、红外光谱分析、力学性能测试、扫描电镜及能谱分析等方法对其开裂原因进行分析。结果表明:聚氨酯管并未发生热氧老化及紫外老化;环境中的细小铝颗粒对管件表面造成磨损,损伤处成为应力集中点并萌生裂纹,裂纹进一步扩展并贯穿管壁,最终导致内部介质泄漏。

The polyurethane pipe of a robot equipment cracked. The cracking reason was analyzed by macroscopic observation, infrared spectrum analysis, mechanical property test, scanning electron microscope and energy spectrum analysis. The results showed that the polyurethane pipe did not undergo thermal oxidative aging and ultraviolet aging. The fine aluminum particles in the environment caused wear on the surface of the pipe, and the damage became a stress concentration point and cracks were initiated. The cracks further expanded and penetrated the wall, eventually led to internal medium leakage.