潤滑油中における表面き裂の応力拡大係数

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  • Stress intensity factors of surface cracks in a viscous lubricant.
  • ジュンカツユチュウ ニ オケル ヒョウメン キレツ ノ オウリョク カクダイ

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抄録

Finite element methods are applied to calculate the squeeze effect of lubricant filling in semi-ellipitical surface cracks under unloading. The two-dimensional Reynolds equation for the lubricant and the three-dimensional elasticity equation for the surface crack specimen are solved simultaneously using an incremental iterative scheme. Although the external stress is zero, the crack opens due to the pressure rise caused by the squeeze effect. For shallow and deep semi-ellipitical surface cracks, the pressure distributions are roughly the same as in the case of a through crack in a thick plate. When the crack depth compared with the surface length is large, since the pressure of lubricant increases and the compliance of the crack opening displacement with the pressure decreases, the stress intensity factors due to the squeeze pressure are kept unchanged.

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