J.G. Yang
,
H.Y. Fang
,
C.L. Fan
,
Z. Luo
,
X.Z. Hou
,
null
金属学报(英文版)
There is a cyclical aperture at a certain part of the fiberglass reinforced plastic compound pipeline with a stainless steel pipe as a liner, which becomes the weakness of the conduit. The field of stress and strain of the aperture was investigated using the nonliner finite element code Marc. The results of the finite element analysis showed that there were concentrations of stress and strain in the layer of stainless steel at the part of the pipeline where the aperture existed. The method to solve these problems was also discussed.
关键词:
compound pipeline
,
null
,
null
X.S. Liu
,
H.Y. Fang
,
W.L. Xu
,
Z.B. Dong
,
D.Y. Yu
金属学报(英文版)
It is a promising and new technology to apply welding with trailing peening to control
welding stress and distortion of titanium alloy. Numerical simulation of conventional
welding and welding with trailing peening of the titanium alloy sheet is carried out,
using nonlinear ¯nite element theory and the engineering analysis software MARC.
The result shows that welding with trailing peening technology reduces longitudinal
residual stress in welding joint e®ectively, and it is more e®ective to reduce residual
stress to peen the weld than to peen the weld toe. It is a e®ective result that other
technology and method used in welding can never achieved.
关键词:
numerical simulation
,
null
,
null
,
null
X.S. Liu
,
H.Y. Fang
,
W.L. Xu
,
X.T. Tian
金属学报(英文版)
The unstable dimensional distortion of LD31 aluminum alloy weldments at room temperature and after thermal cycles was studied by use of light interference and CMM(three-coordinate measuring machines). At the same time, distortion mecha- nism was analyzed from the viewpoint of mechanics and microstructure. Experimen- tal results show that there exists obvious difference of unstable dimensional distortion between LD31 welded specimens under two conditions mentioned above. Under room temperature, dimensional variation of welded specimens will decrease gradually and nally tends to be stable during 200h after welding. The relative elongation of welded specimen is 3.0 10
关键词:
LD31 aluminum alloy
,
null
,
null
