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제안 방법
- The total 100 steps were taken to complete the cut. For each removal process the strip was constrained at the location of C = 5mm, 10mm, 15mm, 20mm, 30mm and 40mm from the cut, respectively. Convergence analysis was primarily conducted by increasing the element refinement to ensure the independence of the solution from the mesh.
- In this paper, the plasticity effect on measuring residual stress using the contour method is numerically simulated for a residual stress distribution under different constraining locations from the plane of the cut. These analyses were performed using a commercial FE package, ABAQUS/Standard[6].
- 1) was assumed to have a residual stress profile created by laser shock peening process. The displacements along the plane of the cut were read after completing cutting the specimen and releasing the constraint, and the displacement field was imposed in an elastic model of the undeformed configuration, as would be done when executing a contour method measurement.
이론/모형
- Surface enhancement techniques such as laser peening have been used to induce a state of compressive residual stress near the blade leading edge in an attempt to mitigate fatigue crack growth initiating from sites of foreign object damage . In order to develop a methodology of the measurement of residual stress and its distribution near the blade leading edge, Rankin and Hill ⑶ applied the crack compliance method for measuring the residual stress created by LSP on a Ti-6AP4V strip. The contour method⑷ has recently been developed and has the capability to determine a two-dimensional map of the residual stress component normal to a plane through an object.
- The contour method for measuring residual stresses of a component created by such as LSP is based on a variation of Bueckners superposition principle ⑸ in elasticity and measuring deformations normal to the plane, created by a cut. Common to other destructive and semi destructive methods, the assumptions are the relaxation process during material removal is elastic and the material removal process itself does not introduce substantial residual stresses into the body.
- In this paper, the plasticity effect on measuring residual stress using the contour method is numerically simulated for a residual stress distribution under different constraining locations from the plane of the cut. These analyses were performed using a commercial FE package, ABAQUS/Standard[6]. A Ti-6A1-4V strip(Fig.
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