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Xu S.,China University of Petroleum - East China | Xu S.,Engineering and Technology Research Center for Special Equipment Safety of Shandong Province | Wang W.,Engineering and Technology Research Center for Special Equipment Safety of Shandong Province | Wang W.,Shandong University
Journal of Pressure Vessel Technology, Transactions of the ASME | Year: 2012

In this paper, the formulae for elastoplastic stress distribution in layered cylindrical vessel layers with gaps have been provided. These formulae are based on the modified Pimshtein formulae for the elastic stress of layers. Plane strain with ideal elastoplastic model of materials is adopted. A practice example is presented to show how the formulae can be used for elastoplastic stress calculation. The hoop, radial, axial, and Von Mises equivalent stresses are obtained. The calculation result showed that the stress state of layered cylindrical vessel is more complex than that of monobloc cylindrical shell due to the interlayer gaps. The stress distribution is discontinuous. Calculation results obtained theoretically were compared to those obtained by finite element method (FEM). It shows that the results from the proposed formulae are in good agreement with finite element results. © 2012 American Society of Mechanical Engineers. Source


Xu S.,China University of Petroleum - East China | Xu S.,Engineering and Technology Research Center for Special Equipment Safety of Shandong Province | Wang W.,Engineering and Technology Research Center for Special Equipment Safety of Shandong Province | Wang W.,Shandong University | And 2 more authors.
Journal of Pressure Vessel Technology, Transactions of the ASME | Year: 2012

In this paper, a modified weld structure of the layered urea reactor has been provided. In the modified structure, new circumferential weld can improve the stress status of the urea reactor. It has the both advantage of separated and integrated layered pressure vessel. This modified design is based on the stress status analysis and the requirement of leak detection. In order to evaluate the modified structure, stresses of original and modified urea reactor shell with interlayer gaps were calculated via Finite element software ANSYS 12.0. The calculation result shows that the maximum stress of the modified structure is reduced obviously in the same condition, and the leak of liner also can be detected effectively. © 2012 American Society of Mechanical Engineers. Source


Zhang M.,Shandong University | Zhang M.,University of Jinan | Zhang M.,Engineering and Technology Research Center for Special Equipment Safety of Shandong Province | Wang W.,Shandong University | And 7 more authors.
International Journal of Fatigue | Year: 2016

The fatigue properties of FV520B-I welding seams with different surface roughnesses up to 109 cycles were tested, and the fatigue behavior and mechanism in a very high cycle regime were studied. The test results showed that FV520B-I smooth welding seams had obvious characteristics of very high cycle fatigue, and cracks mainly initiated from the subsurface when the fatigue life was higher than 107 cycles. As the surface roughness increased to Ra ≈ 0.6, the S-N curve moved downward and cracks usually initiated from the surface. The surface roughness had no effects on the initiation mechanism of subsurface cracks in the welding seam. The initiation modes of cracks in FV520B-I welding seams were more than those of cracks in FV520B-I. The GBF formation mechanism of "dispersive decohesion of spherical carbide" was supported, and the possible crack growth in the GBF was analyzed according to the "effective short fatigue crack criterion". The relationships of a very high cycle fatigue life and sizes of characteristic areas of fractures were further analyzed. The fatigue life increased with a decrease of inclusion diameter and an increase of the ratio of the GBF diameter to the inclusion (pore) diameter. © 2016 Elsevier Ltd. All rights reserved. Source


Sui R.,Shandong University | Sui R.,Engineering and Technology Research Center for Special Equipment Safety of Shandong Province | Sui R.,Shandong Agriculture and Engineering College | Wang W.,Shandong University | And 5 more authors.
Engineering Failure Analysis | Year: 2014

Leakage at the tube-to-tubesheet joints occurred in a waste heat boiler. The mode and the root cause of the failure were investigated by chemical composition analysis of the tube material, metallographic structure and crack observation, and corrosion product analysis of the damaged tubes, as well as the operation condition examination of the waste heat boiler. Results revealed that failure of the tubes occurred due to the stress corrosion cracking (SCC), which was caused by tensile stress and chloride-buildup in the narrow and long gap between the tube and tubesheet hole. The gap formation was further analyzed by comparison of the minimum expansion pressure from the common formula provided by the manufacturer, with that from finite element method computations. It is found that the minimum expansion pressure used in manufacture is small and cannot eliminate the initial gap. Meanwhile, the enrichment of chloride in the gap was briefly discussed. © 2014 Elsevier Ltd. Source


Zhang T.R.,Shandong University | Zhang T.R.,Engineering and Technology Research Center for Special Equipment Safety of Shandong Province | Wang W.Q.,Shandong University | Wang W.Q.,Engineering and Technology Research Center for Special Equipment Safety of Shandong Province | And 2 more authors.
Procedia Engineering | Year: 2015

A hot pure water storage container made by an equipment manufacturing company in Jinan, Shandong for a chemical company in Dezhou, Shandong spilled during its operation. By analyzing the chemical composition and metallographic structure of the sending sample and observing the crack morphology, we find it being the typical stress corrosion cracking of stainless steel in medium with chloride ion, which caused the leaking of this hot pure water storage container. Based on this, further analysis shows the concentration of chloride ion in hot water and the improper selection of hot pure water storage container's material, as well as the residual stress after cold working are the main causes of the stress corrosion cracking in this hot pure water storage container. The work presented in this paper may provide an approach to prevent similar accidents. © 2015 The Authors. Source

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