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【期刊论文】Analysis of FCC sheet metal formig with rate-independent polycrystalline plasticity FEM
彭颖红, ZHANG Shao-rui(张少睿), LI Da-yong(李大永), LUO Ying-bing(罗应兵), PENG Yign-hong(彭颖红)
Trans. Noferrous Met. Soc. China, Apr. 2004, Vol, 14 No.4,-0001,():
-1年11月30日
A rate-inderpendent polyerystallme plasticity constitutive model considering sclf and latent hardening was develped. Next, a new orientation probabillity assignment method was proposed and the crystal orientations were assigned to FE integration points, which reprcenet crystals and can rotate individually. Then eup drwing of FCC aluninum sheet was studied usig erystalline plasticity finite fimite element analysis. The results show that the validity of proposed model is proved throuth compatison bet ween numerical results and experimental. For the roled aluminum sheetm which contains strong {001}<110> texture, caring is formed at 45
FCC sheet metal, rate-independet, texture, po, ycrystalline plasticity FEM, orientaion probablility assignment
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彭颖红, LI Da-yong(李大永), ZHANG Shao-rui(张少睿), PENG Ying-hong(彭颖红), HU Ping(胡平)
Trans. Noferrous Met. Soc. China, Apr. 2003, Vol, 13 No.2,-0001,():
-1年11月30日
The anisotropy of stamped sheet metal exerts evident effects on the formability. Barlat aix-component yield function was introduced into theelastoplastic finite element formulation based on the principle of virtual velocity and the discrete Kirehhoff triangular element model. The flanging earing in cylindrical capdrawing process of circular sheet metal was aumerically simulatad. Th influence of anisotropy on the forming process was studied.
anisotropy, Barlat six-compoaent yield function, elastoplastic finite element, earing
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【期刊论文】FEM and FVM compound numerical simulation of aluminum extreusion processes
彭颖红, ZHOU Fei(周飞), SU Dan(苏丹), PENG Ying-hong(彭颖红), RUAN Xue-yu(阮雪榆)
Trans. Noferrous Met. Soc. China, Apr. 2003, Vol, 13 No.2,-0001,():
-1年11月30日
The finite element method (FEM) and the finite volume method (FVM) nurmeircal sinrmalation methods have been widely used in forging industries to imrovethe quality of products and reduce the costs. Because of very concentrative largedeformation during the aluminum extrusion processes, it is very difficult to simulate the whole forming process only by using either FEM or FVM. In order to solve this problem, an FEM and FVM compoun simulation method was proposed. The theoretical equation of the compound sinmulation method were given and the key techniques were studied Then, the cofiguration of the compound simulation system was estabished. The tube extrusion process was simulated successfully so as to prove the validity of this approach for aluminum extusion processes.
FEM, FVM, cmpound simulation, aumium extrusion
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彭颖红, ZHANG Shaorui(张少睿), PENG Yinghong(彭颖红), LI Dayong(李大永), YANG Hongbo(杨洪波)
,-0001,():
-1年11月30日
Springback of sheet metal induced by elastic recovery is one of major defects in sheet metal forming processed. Springback is influenced by many factors including properties of the sheet material and processing conditions. In this paper, springback simulation is conducted and comparisons between results based on different processing variables are illustrated. Furthermore, the discovery of knowledge of the effects of geometry and process parameters on springback from FEM results becomes increasingly important, as the number of numerical simulation has grown exponentially. Data mining is an effective tool to realize knowledge discovery in simulation results. In the present paper, a data-mining algorithm, rough sets theory (RST), is applied to analyze the effects of process parameters on springback in U-bending.
FEM,, springback,, data mining,, rough sets theory,, principal component analysis
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【期刊论文】Key technologies of "zero die trial" design system for aluminum profile extrusion①
彭颖红, LUO Chao(罗超), LI Da-yong(李大永), PENG Ying-hong(彭颖红), ZUO Tie-yong(左铁镛)
Trans. Nonferrous Met. Soc. China, Aug. 2004, Vol. 14 No.4,-0001,():
-1年11月30日
Aluminum alloy profile parts are widely used in the fields of aviation, equipment, automobile and ornamental industries. The construction method for "zero die trial" intelligent design system of aluminum extrusion die was studied based on KBE idea. An object-oriented knowledge language AEKL(Aluminum Extrusion Knowledge Language) was developed to construct intelligent knowledge model with three methods, frame, parameters and rules. On the aspect of knowledge reasoning, case-based reasoning was employed in addition to traditional rule-based reasoning method. API provided by CAD N17platform was used in geometry disposal. Finally, the corresponding protoyping system was established and an design example was shown.
aluminum profile extrusion, zero die trial, knowledge based engineering, simulation
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