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Influence of surface roughness on leakage of new metal gasket

机译:表面粗糙度对新型金属垫片泄漏的影响

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摘要

Previous studies of new metal gaskets have established that the contact width, contact stress, and simulation process are important design parameters for optimizing the metal gasket performance. Optimum designs are thus realized based on the elastic and plastic contact stress. However, the influence of the flange surface roughness has not been investigated thoroughly. In this study, we developed a gasket model that includes the flange surface roughness effect. A flange can have different surface roughness levels. A finite element method was employed to develop the simulation solution. The contact width, contact stress, and force per unit length for gasket in contact with a flange having different surface roughness levels were obtained through the simulation. The leakage performance improved with an increase in the contact width and contact stress. The slope of the force per unit length increased with a decrease in the surface roughness level. Furthermore, the slope of the force per unit length for a gasket in 400-MPa mode was higher than that for one in 0-MPa mode. The higher slope suggests that the gasket and flange are pressed together strongly. Finally, the helium leakage quantity was determined to evaluate the leakage performance. The experimental result shows that the gasket in 400-MPa mode shows better sealing performance than the gasket in 0-MPa mode. For a low axial force, changes in the surface roughness caused significant changes in the leakage; the same was not observed for a high axial force.
机译:以前对新型金属垫片的研究已经确定,接触宽度,接触应力和模拟过程是优化金属垫片性能的重要设计参数。因此,基于弹性和塑性接触应力实现了最佳设计。但是,尚未彻底研究法兰表面粗糙度的影响。在这项研究中,我们开发了包括法兰表面粗糙度影响的垫片模型。法兰可以具有不同的表面粗糙度等级。采用有限元方法来开发仿真解决方案。通过模拟,获得了与具有不同表面粗糙度水平的法兰接触的垫片的接触宽度,接触应力和每单位长度的力。随着接触宽度和接触应力的增加,泄漏性能得到改善。每单位长度的力的斜率随着表面粗糙度的降低而增加。另外,在400MPa模式下的垫片的每单位长度的力的斜率比在0MPa模式下的垫片的每单位长度的力的斜率高。较高的斜率表明垫圈和法兰被强力压在一起。最后,确定氦气泄漏量以评估泄漏性能。实验结果表明,在400 MPa模式下的垫片比在0 MPa模式下的垫片具有更好的密封性能。对于低轴向力,表面粗糙度的变化会引起泄漏的显着变化。对于高轴向力,未观察到相同的结果。

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