Jeonghwan Nam
The Journal of Mechanical Science and Technology, vol. 22, no. 12, pp.2337-2349, 2008

Abstract : In this paper, photoelastic experimental hybrid methods using the external traction free boundary condition and that using the relative equation of two stress functions in contact problems are developed. The validities of these two methods are confirmed through experiments and discussions. Hertz’s contact theory and the two photoelastic experimental hybrid methods explained are applied to the analysis of the contact stress of an O-ring under 10% or 20% squeeze rate. The photoelastic experimental hybrid method using the relative equation of two stress functions in contact problems was found to be more effective. When the squeeze rates of an O-ring were 10% or 20%, the maximum of absolute σ x was greater than the maximum of absolute σ y , but was almost equal. Maximums of absolute τ xy were 1 8 of absolute σ x and 1 5 of absolute σ x when the squeeze rates of the O-ring were 10% and 20%, respectively.

Keyword : Contact problem; Hertz’s contact theory; O-ring; Photoelastic experimental hybrid method; Squeeze rate; Stress Function;