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A Griffith crack model in a generalized nonhomogeneous interlayer of bonded dissimilar half-planes

100%

Zhang A. , Lou J. , Wang B. , Wang J.

Journal of Theoretical and Applied Mechanics

2023

tom Vol. 61 nr 3

495--507

The Griffith crack problem in bonded dissimilar half-planes is examined. To eliminate the unrealistic oscillatory stress near the interface crack tips, the interfacial transition zone is modeled by a very thin nonhomogeneous interlayer whose elastic properties vary contin- uously between the bonded materials and adhesive material. The interlayer thickness is assumed to be the sum of the maximum heights of asperities at the two bonded material surfaces. The crack problem is reduced to a set of Cauchy integral equations which can be solved numerically. The applicability of the generalized nonhomogeneous interlayer model is investigated by comparing it with the classical interface crack model.

Surface properties enhancement of Inconel 718 alloy by ultrasonic roller burnishing coupled with heat treatment

75%

Shen X. , Gong X. , Wang B. , He J. , Xu C. , Su G.

tom Vol. 21, no. 3

618--634

Ultrasonic burnishing (UB), in which a ball tip is usually utilized, has been proved to be an effective method for metal surface strengthening. In this study, a roller tip was employed in the ultrasonic burnishing of Inconel 718 alloy (ultrasonic roller burnishing, URB). Meanwhile, a new surface modification technique, i.e., a combination of URB and heat treatment (URB/HT), was advanced to achieve better surface finishing. The surface integrities together with the mechanical behaviors of various samples treated by URB or URB/HT were experimentally examined and compared. Meanwhile, the transient stress distribution of the being treated materials with two treatments was comparatively analyzed by the FEA method. As result, compared with URB, the URB/HT-treated sample had better surface morphology, lower surface roughness, higher micro-hardness, and more well-distributed compressive residual stress. Furthermore, URB/HT-treated samples presented higher yield strength and lower wear rate in comparison with the URB-treated ones. The reduction of deformation resistance and easy flow of the near-surface material during URB/HT treatment mostly contributed to the excellent surface finishing.