石墨垫片是一种广泛使用的静密封, 其良好的密封性能取决于密封界面的力学特性。为了研究石墨垫片密封界面的力学特性, 该文基于现有密封实验台结构和材料弹塑性, 建立了垫片系统有限元模型, 模拟实验台加卸载工况, 仿真研究垫片的力学特性。实验测量了垫片压缩回弹曲线。仿真结果给出了垫片在加载和卸载过程中接触压力、变形和压缩回弹曲线的变化情况, 与实验测量结果吻合, 验证了仿真方法的正确性, 进一步从理论上阐明了此类垫片实现高接触刚度、高动载稳定性和高安装重复性的工作机理。
Abstract
Graphite gaskets are widely used static seals. This study examines the mechanical properties on the seal interface which is significant to the sealing performance. The study uses finite element simulations based on a test rig structure and elastic-plastic material properties. The compression-resilience curve is measured in the same test rig. The simulations show the changes in the contact pressure and deformation distribution during loading and unloading. The simulated compression-resilience curves agree with the measured data to validate the finite element model. The results explain the sealing mechanism of high contact stiffness, load stability, and installation repeatability for this kind of gasket.
关键词
柔性石墨复合垫片 /
石墨垫片 /
密封界面 /
有限元仿真 /
弹塑性
Key words
flexible graphite composite gasket /
graphite gasket /
sealing interface /
finite element simulation /
elastic-plastic
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参考文献
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基金
国家科技重大专项(2014ZX06002007)
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