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The Residual stresses and Strains in the Composite Material Barrel

The Residual Stresses and Strains in the Composite Material ...

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2007国际机械工程与力学会议

作者： Jianhua WANG Linfang QIAN Renshu YUAN School of Mechanical Engineering Nanjing University of Science and Technology

This paper aims at establishing a model to calculate the residual stresses and strains in the composite material barrel and analyzing the effect of some factors such as the volume fractions of the composites, the change of the temperature during the curing process, the fiber tension and the winding angles during the winding process. The lay-by-lay modelling technique which is better than other theories applied in the composite material structures is used in the model. Raissner-correction theory which is based on the Kirchhoff-Love suppose is used to calculate the thermal residual stresses and strains, and at the same time the winding angles and the volume fractions of the composite material structures are also considered. According to the theory of cylinder shell, the model gives a set of formulations to compute the residual stresses and strains caused by the winding tension and the tension-decrease change during the manufacturing process. A computer program is developed to simulate the residual stresses and strains in the composite material barrel, and the flow charts are also given. According to the values of the residual stresses and strains, we can select reasonable operating conditions and working parameters during the manufacturing process to improve the strength of the composite material barrel.

关键词： Composite material Gun tube Residual stresses Winding tension thermo-stress

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Three-dimensional thermo-mechanical finite element simulation for casting ladle structure under thermal loadings

Three-dimensional thermo-mechanical finite element simulatio...

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第五届国际材料与热加工物理模拟及数值模拟学术会议

作者： Shouju LI 1 a Yingxi LIU1 b and He YU 1 c 1 State Key Laboratory of Structural Analysis for Industry Equipment Dalian University of Technology Dalian 116024 Liaoning China

The finite element model of coupling the thermal field with structural analysis is proposed in order to analyze the thermo-stress of casting ladle structure. The thermal fields of casting ladle with refractory lining structure are computed according to the thermal properties of materials and boundary conditions. Numerical simulation shows that that computed outer temperatures of casting ladle agree with measured ones. The thermo-stress of casting ladle structure is simulated by taking thermal loadings as the loading conditions of the steel shell structure. Material behaviors were described by the Drucker-Prager plasticity model and Von Mises yield criterion. Calculation results of thermo-stress fields shows the outer shell structure is safety under the action of thermal loadings.

关键词： casting ladle thermo-mechanical loadings thermo-stress finite element method temperature fields thermal properties.

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