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- 저자 : Maosheng Shu (검색결과 2 건)
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Optimum Blank Design of Thick-Plate Metal Forming without Blank Holder
Jian Lan,Mianli Zhang,Huajie Mao,Maosheng Shu,Lin Hua 한국소성가공학회 2010 기타자료 Vol.2010 No.6
Many blank design methods are used in sheet metal forming industry, but most of them originated from applications of thin sheet metal forming with blank holder. There are few researches on blank design methods of thick-plate metal forming without blank holder, which process has two characteristics: workpiece thinning locally and severely, workpiece inside surface not contacting with top punch because of local bulk deforming. An optimum blank design method is proposed in this paper for the thick-plate metal forming without blank holder. This method consists of two stages: the initial blank design stage and the blank optimization stage. The first stage is to obtain initial blank shape using Inverse Finite Element Approach (IFEA) from the middle-thick layer of 3D model of target part. In the second stage, firstly, simulate and obtain deformed workpiece by forward finite element analysis; then calculate the shape error between deformed workpiece and target part, and the indicator △ of optimization procedure; finally, correct the blank shape by the feedback of shape error until the indicator △ is smaller than tolerance. In order to verify the proposed method, a reverse arm bracket is investigated.
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Tensile performances of single-lap countersunk composite joints with metallic bushing
Xiaoquan Cheng,Xiaoyuan Du,Kun Chen,Maosheng Shu,Xiaodong Liu,Gang Chen 국제구조공학회 2021 Steel and Composite Structures, An International J Vol.40 No.3
Tensile tests were carried out on the single-lap countersunk composite joints with metallic bushing, and the load-displacement curves, strains and damage morphologies around the bolt hole were measured. A 3D progressive damage finite element model (FEM) was established in ABAQUS/Standard and verified by experimental results. Based on the validated model, tensile performances of the joints were investigated, including damage mechanism analysis of the laminate and the effect discussion of bushing thickness, tightening torque, interference fit size and etc. The results show that metallic bushing can improve ultimate bearing load of the joints. The stress distribution and initial damages caused by assembly around the laminate hole are little affected by bushing thickness. Appropriate tightening torque and interference fit size can improve tensile performances of the joint.
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