Method for estimating the thightness of a seal

摘要

A method for estimating a seal of a gasket, including: digitally simulating, using a computer, a creep deformation of a gasket resulting from crushing of the gasket between two bearing surfaces; calculating, at an interface between the gasket and one of the two bearing surfaces and during the computer simulation, a cumulative plastic deformation of the gasket, an axial stress between the gasket and the one the two bearing surfaces, and a contact length between the gasket and the one of the two bearing surfaces; and calculating a simulated porosity filling coefficient, representing the seal of the gasket at the interface.

主权项

1. A method for estimating tightness of a seal, comprising:
performing, on a computer, digital simulation of a deformation by creep of the seal by compression of the seal between two surfaces; calculating, on the computer and at at least one interface between the seal and one of the two surfaces, of a cumulative plastic deformation p of the seal, of an axial stress Smzz between the seal and the one of the two surfaces, and of a contact length Lc between the seal and the one of the two surfaces, during the digital simulation; calculating, on the computer, a simulated pore plugging coefficient Fnum, representative of tightness of the seal at the interface between the seal and the one of the two surfaces, such that:Fnum=∫rire⁢∫0p⁢⁢ma⁢⁢x⁢λ·(Smzzσseuil)α·(pp0)β⁢ⅆp⁢ⅆrr,where
λ, α and β: coefficients with values that depend on the material of the seal, re and ri: respectively external radius and internal radius of the deformation of the seal, m, r: position along contact between the seal and the at least one of the two surfaces,
Lc=re−ri,m, Smzz: axial stress, MPa, σseuil: threshold stress equal to 1 MPa, p: cumulative plastic deformation, pmax: maximum value attained by p during the simulation, p0: constant equal to 1.