[en] Analyzed are the tractions induced by the generalized contact configuration and the tilting of the contacting body. The friction energy dissipation from the contact surface differs if the contacting body is tilted and the end profile of it changes. The internal stress is found to move to the direction of the tilting. Therefore, it is thought that a special concern needs to be given during the contact design in the point of tilting (and alignment). From the crack analysis, it is found that the influence of the tilting on the cracking behaviour is negligible. When a bulk tension is applied, however, K_I increases considerably even though the variation of K_II is very small. In that case, K_I increases as the crack length increases. The improvement of contact configuration is taken into consideration as one of the approaches to restrain the contact failure. As for the configurations, a rounded punch (R-punch), a truncated punch (T-punch) and a rounded and truncated punch (RT-punch) are considered. By the R-punch, the slip region is the smallest, and so is its expansion velocity. In the case of partial slip, it is found that the slip region can expand to the location of the peak normal traction. If shear force exceeds further, gross slip immediately occurs in the whole contact area. So, the limit of the shear force is the one by which the location of shear peak reaches that of normal peak to form the partial slip. To restrain the contact failure, especially wear damage, it is required to confine the shear force less than the limit. The wear in water environment is more severe than that in air. This is explained by the size and the dispersion of the wear debris, which is affected by the environmental difference. No oxidation is found on the worn surface. The wear coefficient K of the workrate model is larger in the case of gross slip compared with K of partial slip. The mechanism of fretting wear has been said that it starts from the adhesive wear, then abrasive wear prevails after wear debris is produced. Since this cycle can be accelerated in water due to the ease of the debris dispersion, the severe wear in water may be explained such a way. On the other hand, it is found difficult to say that the wear volume increase rate is always linear to the workrate, which the workrate model implies. It may be influenced by the material difference, the experimental condition (e.g., environment) and the slip regime