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RISS 인기검색어
- 검색키워드
- 저자 : Olaf Engler (검색결과 4 건)
- 무료
- 기관 내 무료
- 유료
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Analysis of Earing in Deep Drawn Cups
Holger Aretz,Johannes Aegerter,Olaf Engler 한국소성가공학회 2010 기타자료 Vol.2010 No.6
The cup-drawing of a strongly anisotropic sheet metal is simulated using a commercial finite element software along with a user material subroutine. In order to accurately describe the plastic anisotropy of the material the well-known recent yield function ‘Yld2004-18p’ is extended. Regarding the experimental characterization of the considered material the occurrence of dynamic strain aging lead to an oscillating signal of the width change of the tensile samples, which prevented a reliable determination of plastic strain ratios (r-values). Thus, an improved measurement concept was developed that leads to a very robust and reproducible determination of r-values. Furthermore, a novel plane-strain tensile test sample is presented which is used for the characterization of the plastic anisotropy in biaxial loading states. A quantitative comparison with measured earing profiles of deep drawn cups illustrates the predictive capabilities of the numerical simulation.
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Effect of Strain Paths on Development of Shear Textures during Rolling in Aluminum Sheets
이계만,강형구,허무영,Olaf Engler 대한금속·재료학회 2010 METALS AND MATERIALS International Vol.16 No.5
Two different types of shear textures were observed in cold rolled aluminum sheets after normal rolling without lubrication and after asymmetrical rolling carried out with the upper and lower rolls running at different velocities. Finite element simulations showed that the formation of the different shear textures could be attributed to differences in the strain history during rolling. The development of shear textures was quantified by assuming various idealized strain paths in polycrystal-plasticity deformation texture simulations. The net shear accumulating during a rolling pass plays an important role in determining the type of the resulting shear texture.
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오규진,이계만,허무영,박진언,박수호,Olaf Engler 대한금속·재료학회 2017 METALS AND MATERIALS International Vol.23 No.1
Three initial tensile specimens having different textures and, in consequence, different r-values were cut from a sheet of an interstitial-free steel. Using these specimens, the effect of r-value and texture on plastic deformation and the necking behavior were studied by tackling the strain state and texture during tensile tests. A reduced decrease in work hardening rate of tensile specimens with higher r-values led to a slower onset of diffuse necking which offers an increased uniform elongation. A slower reduction in thickness of specimens with a higher r-value provided a favorable resistance against onset of failure by localized necking.
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Evolution of Through - Thickness Texture Gradients in Various Steel Sheets
Kim, Hyun Chul,Huh, Moo Young,Pak, Jong Jin,Engler, Olaf 대한금속재료학회(대한금속학회) 1999 METALS AND MATERIALS International Vol.5 No.5
In order to investigate the evolution of through-thickness texture gradients in various ferritic steel sheets, samples of a deep drawing steel, a ferritic stainless steel and a low carbon steel were deformed by cold rolling with and without application of a lubricant during the deformation process. The hot band texture of all samples examined showed notable through-thickness texture gradients. The evolution of the cold rolling texture in the ferritic stainless steel and the low carbon steel in a solution-treated state was nearly independent of the lubrication during rolling. However, in the deep drawing steel and the as-received low carbon steel, the lubrication played an important role in the formation of the through-thickness texture gradients. Whereas the samples rolled with lubrication showed uniform textures throughout the sheet thickness, in the samples rolled without lubrication pronounced shear textures were observed on the sheet surface. The evolution of these through-thickness texture gradients is discussed in terms of inhomogeneous strain states computed by an FEM model.
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