Considering the tangential force applied on a contact spot, the critical area demarcating the elastic and plastic regimes is obtained by comparing the normal elastic load with the normal plastic load.

计及作用于接触斑点上的切向力，通过比较作用于接触斑点上的法向弹性载荷与法向塑性载荷，确定了区分弹性接触与塑性接触区域的临界接触斑点面积。

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The results show that opening point, opening angle, maximal tangential stress and critical load vary with aspect ratio and inclined angle. The most dangerous inclined angle is obtained accordingly.

结果表明，开裂点、开裂角、最大切向拉应力和临界载荷随椭圆的纵横轴比和倾角的不同而变化，由此可得到最危险的倾角。

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Based on the maximal tension stress theory, formulae of maximal tangential stress and critical load are presented.

根据最大拉应力理论，给出了最大切向拉应力和临界载荷公式。

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