ed hardy Aluminum Pre-stretching of residual stres

Aluminum Pre-stretching of residual stress finite element numerical simulation

Density increase; and away from the just-ended regional (400rflm outside) deformation is uniform, the vertical element mesh density is light; unit width and thickness along the direction of the grid is evenly divided (see Figure 1). Each unit is composed of 8 three-dimensional nodes, a total of 9,600 units, a total of l1907 a node. L model around three-dimensional finite elements mesh Figure 5 1999 Xiang Mao: aluminum basin pre-stretching board of residual stress finite element numerical simulation of Figure J3 Taijin choice of materials selected typical, typical specifications to be represented sex. Alloy state: 7075 alloy plate quenching, tensile state; Specifications: 40ram × l300ram × 3300ram: 2 finite element numerical simulation results analysis,[link widoczny dla zalogowanych], we assume that each jaw tension and no relative motion between the plates. Chuck groups were regarded as rigid body, which is in the ideal state of uniform tension. To facilitate the description of r, we will be divided into the residual stress after stretching along the length direction and along the width direction of the two aspects. 21 o long residual stress distribution to the residual stress in a long section (see Figure 2). Is depicted in the figure from the edge of the jaw-z cross section. Stress distribution. Y coordinate in the length direction width direction of the x direction. Thickness direction for the z direction. Xz cross-section on the left to take the short side of the midpoint of the origin of coordinates. Figure 3,4 from the jaw edge, respectively d = 0mm, d = 100mm in the x-z cross section of the \tensile, compressive stress was symmetrical distribution width at the edge of l5Omm from within the width of the central region of the stress is stabilized at a certain range. At the same time, stress and alternating with the thickness change regularly. When d = 100mm,[link widoczny dla zalogowanych], the pull , reduced the peak compressive stress is very small, most of the width direction of regional stress has become a near zero when d = 1650ram (ie the plate central region), stresses the value of all zeros. so that x-z cross-section with the residual stress the d value increases (ie, away from the jaws clamp end), smaller peak stress, and tends to zero. Mao uniform tension in Figure 3 the length from the chuck 0tTtrn section uniform tensile stress distribution in Figure 4 The length from the chuck 100mitt section 2.2 the stress distribution width o the distribution of residual stress to the residual stress in wide cross-section (see Figure 5), coordinates the direction above, but the origin of coordinates to the central y-z cross section . - Ice Figure 5 the width direction cross section of residual stress analysis sections is depicted in Figure 6,7,8 width from the edge of Ⅳ = 20mm.W = 65mm and W = 650mm in the-z o cross-section distribution of residual stress. W = 20mm in cross section. the width of the end surface from which the stress distribution in Figure 6 shows the two ends of length occurs in the tensile and compressive peak stress. The value close to the ultimate strength; from the length of the edge (the edge away from the jaws ) 250mm Department. stress has been reduced to piles. 52 Light Metal 1999 8 5 Zhuo foment the country stretching from the edge of the uniform 650myl1. section width W = 65133.m stress distribution in the direction of, I 11 '] can still see the stress peak in the length direction of the ends, but the size of the peak much less than in Figure 7; from 250mm at the edge of length, stress has been reduced to zero. W = 650nlm, that the central area of the cross-section width on 50mm in length at the edge, the stress has been reduced to zero. In other y-z cross section. tension and compression stress appears in the location and quantity of the same previously described. but values have changed. from the edge of length the transition to the central region,[link widoczny dla zalogowanych], the stress changes in a larger gradient near the central region of Vietnam, the smaller the residual stress. 3 Conclusion lot of theoretical and research. on the side just under ideal conditions,[link widoczny dla zalogowanych], the typical uniform tension pre-stretch board stress the following conclusions: [1) side just under the ideal conditions of uniform tension, the 7075 alloy pre-stretched plate most of the regional stress distribution is uniform, the stress tends to zero; only in the jaw folder near the holding area, were affected by the uneven distribution of just-ended,[link widoczny dla zalogowanych], leading to a tensile residual stress. this part of the stress in the subsequent cutting in to remove. 【2j industrial production test through the validation, the finite element used in this article numerical simulation to obtain the stress theory of distribution model can fully reflect the pre-stretching board real stress distribution. c3) uniform tension is pre-stretching board uniform residual stress distribution and stress the key. l4) Production Practice , we should try to make the clamp holding the desired state of 1:3, resulting in excellent technical performance of the pre-stretching board. l Editor Wu Honglin)

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