法兰与金属垫片密封表面接触分形模型

Contact Model of Sealing Surfaces for Flange and Metallic Gasket

考虑法兰与金属垫片接触属于静接触,接触界面摩擦作用对其不产生影响,在修正的M-B接触模型基础上,建立法兰与金属垫片密封表面接触模型,得到了无量纲真实接触面积与压紧应力的关系.研究表明,真实接触面积随着垫片上压紧应力的增加而呈线性增加;在相同接触应力下,真实接触面积随分形维数D的增大而增大,随尺度系数C的增大而减小,即表面越光滑真实接触面积越大.这为金属垫片密封性能的研究提供了依据.

Due to the modified M - B model, the contact between flange and metallic gasket was static. Therefore, the friction force of friction interface exerts no impact. Accordingly, a contact model of sealing surfaces of flange and metallic gasket was established and the relation between the contact area and the compressive stress was also examined. The study shows that real contact areas increase linearly in line with the increase of compression stress of the gasket; under similar contact stress, real contact areas increase as fractal dimension D mounts, while real contact areas decreases when scale coefficient C increases. That is to say, the smoother the surface, the larger the real contact areas. This finding provides basis for studying sealing property of metallic gasket.