Authors: Gab Chul Jang, Kyong Ho Chang, Chin Hyung Lee
Abstract: During the welding process to make welded joints, residual stress is inevitably generated
and weld metal is used. Welding Residual stress is influenced on the behavior of welded joints under
monotonic and cyclic loading. And the weld metals used in welding process have different
mechanical characteristics than structural steels. Therefore, to accurately predict the hysteretic
behavior of welded joints, the effect of residual stress and weld metal must be investigated.
In this paper, the residual stress distribution in a welded tubular T-joint was investigated by
carrying out three-dimensional non-steady heat conduction analysis and three-dimensional thermal
elastic-plastic analysis. To consider a effect of base metal(SM490) and weld metal(E71T-1), a cyclic
plasticity model was formulated based on monotonic and cyclic loading tests. And the formulated
model was applied to three-dimensional elastic-plastic finite element analysis. The effect of residual
stress and weld metal on hysteretic behavior of a welded tubular T-joint was investigated by carrying
out numerical analyses considering residual stress and cyclic plasticity model of base metal and weld
metal respectively.
2077
Authors: Xiao Jian Wang, Hua Cheng, Zhi Shu Yao, Hai Bin Cai
Abstract: The article proposes boring shaft lining used super strength steel fiber concrete and double steel cylinder to solve the problem of the construction of shaft lining in deep alluvium of 700~800m, and studies the mechanical characteristics and failure of the shaft lining structure based on the model testing. The studies indicates that boring shaft lining structure used super strength steel fiber concrete and double steel cylinder may greatly improve the capacity of the shaft lining, the ductility of common high strength concrete shaft lining, obtains good plastic characteristics and upgrades the reliability of the shaft lining structure. In addition, strengthening coefficient of super strength steel fiber concrete based on theoretical analysis and experimental results, providing the design references for the engineering application of the new type shaft lining structure.
1101
Authors: Shang Bin Wang, Xin Zhou Zhang, Kai Wu, Yu Sun
Abstract: A new finite element analysis method of driver drum is introduced in this paper, conveyor belt is introduced in analysis model, and the effect that bearing imposed on drum is treated as spherical constraints. The drum is analyzed under the coalition of assembly load and ultimate torque load using the paper method as well as the traditional method, and the results between two methods are compared. The analysis results show that the danger points are on the hub inner and the weld seam between spoke and hub, the comparison shows that the analysis results by the paper described method are smaller than the traditional method results by 10%. The load imposing ways described in this paper are more consistent with the actual work process, and the analysis results are more accurate and reliable.
764
Abstract: In the paper, the interface crack of rubber - metal ring under the radial displacement load was studied by nonlinear finite element method, changes of the tear energy with crack dimension which extending from extrusion end and tensile end along the axial and circumferential direction to the interface was analyzed. The result is that there is a certain possibility of axial extension in the tensile end. The crack propagation is most likely to occur along the circumferential direction while is impossible along either axial or the circumferential direction in the extrusion end
180
Authors: Feng Li, Qi Lin Zhao, Jian Ping Wang
Abstract: Compression performance of pultruded GFRP (Glass Fiber Reinforced Plastics) can be improved by confined CFRP (Carbon Fiber Reinforced Plastics) sheet, but it was affected by some factors. Two groups GFRP short pipe specimens of different outer diameter (104mm and 76mm) were axial compressed. The failure modes of longitudinal splitting and compressive strength failure for the GFRP pipes and those confined by CFRP sheet respectively were comparatively analyzed. Analysis on the influence to the compressive performance of GFRP short pipes confined by CFRP sheet was made from mechanical and geometrical parameters of the CFRP and GFRP in numerical methods. The laws of improvement of compression performance of CFRP sheet confined GFRP short pipe were recognized.
863
