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Wang H.-M.,Hunan Special Equipment Inspection and Testing Center | She X.-Y.,Hunan Special Equipment Inspection and Testing Center | Yang S.-Q.,Hunan Special Equipment Inspection and Testing Center | Chen S.-J.,Hunan Special Equipment Inspection and Testing Center
Petrochemical Equipment | Year: 2012

On the basis of a series of experiments to sampling points from the failure site of air pipeline, such as macro test, PT, thickness, hardness, ferrite, RT, spectroscopy and microstructure analysis, in addition to this, to compare the existing pipe system to that with support about stress and deformation, and finite element analysis on the failure eccentric reducer, this paper found out that the reasons on failure of air pipeline. Feasible measures are taken to stop similar accident. Source


Shen Y.,Xiangtan University | Liu J.,Xiangtan University | Shi Y.,Xiangtan University | Dai B.,Xiangtan University | And 2 more authors.
Applied Mechanics and Materials | Year: 2012

In order to know the concrete distribution of welding residual stresses in Megawatt wind turbine's basis, Msc.Marc codes by finite element method were applied to simulate temperature and stress field of the base's welded joints which were appeared on the screen by 3D real-time dynamic numerical, the distribution of welding temperature field and the residual stress is obtained and then the test results of welding residual stress are checked by Blind-hole method. The welding residual stress in the condition of anneal and non-anneal was comparatively analysed. The results show that the transverse and longitudinal residual stresses in the area near the weld are comparatively larger, and the variation trend of the transverse and longitudinal residual stresses in the area far away from the weld are nearly the same. It means that the FEM determination results coinciding with test results are available for reference to the design of the Wind-driven generator welding structure. Source


Ma W.,Xiangtan University | Ma W.,Hunan Special Equipment Inspection and Testing Center | Chen S.,Hunan Special Equipment Inspection and Testing Center | Liu H.,Hunan Special Equipment Inspection and Testing Center | And 3 more authors.
Hanjie Xuebao/Transactions of the China Welding Institution | Year: 2011

The significant error of the measuring result may arise when measuring welding residual stress by means of the blind hole method. Because the stress around the hole exceed the yield limit, the plastic deformation induces plastic strain. Therefore, based on the principle of the calibration experiment, the strain release coefficients A and B of the steel Q345R are determined. According to the energy parameter S, the strain release coefficient A and B can be revised by the variation formulas; by this method, the result of measuring high residual stress can be more accurate. Based on the strength theory, the strain release coefficients A and B of steel Q345R, which were numerically calculated by the finite element method (FEM), coincide well with the calibration experiment results. So the FEM determination of the strain release coefficients A and B is viable. Source

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