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Study on mechanism of circumferential cracks in cold-region tunnels

Global Geology 2010年第2期13卷 75-78页

作者： ZHOU Lincong ZHENG Yifeng LI Zhong College of Construction Engineering Jilin University Changchun 130026 China

There exists frost damage in cold-region tunnels. The circumferential cracks affect the function of tunnels. Using three-dimensional finite element method, the authors analyzed the mechanism of circumferential cracks in cold-region tunnels It is proved that the internal thermal stress in lining exceeds the tensile strength of concrete, which is the direct cause for circumferential cracks occurring. The laws of thermal stress in lining induced by parameters such as temperature drop, horizontal drag coefficient and length of lining are analyzed. The conclusions are valuable to the design and construction of cold-region tunnels considering the thermal stress.

关键词： tunnel cold region circumferential crack temperature stress

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DAMAGE TOLERANCE AND FATIGUE LIFE ESTIMATION FOR PIPE/ROD BAR STRUCTURE

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Transactions of Nanjing University of Aeronautics and Astronautics 2011年第2期28卷 169-175页

作者： Dura Hari Bahadur 吴铁鹰吴志功南京航空航天大学能源与动力学院

The damage tolerance for pipe/rod bar in the auxiliary power units （APUs） support system is studied. The main objective is to study whether planes can safely land when the fatigue crack appears on the bar. Firstly, the stress intensity factors （K~） of two bar structures are computed, and the iso-stress intensity factor （iso-Kl） model is presented. The model uses the finite element model （FEM） instead of the parameters of material to com- pute the crack propagation. Then, the general relations between Kt vs crack size are obtained for different mate- rials, inner to outer diameter ratios （D^n/Dout） and external crack propagation angles （0）. Finally, the FEM anal- ysis results are input to the ANSYS parametric design language（ANSYS-APDL） software. And the fatigue life of damaged bar is estimated under the condition of loading spectrum.

关键词： fatigue crack propagation circumferential crack stress intensity factor pipe/rod bar

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Sanders＇ Mid-long Cylindrical Shell Theory and its Application to Ocean Engineering Structures

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Journal of Marine Science and Application 2012年第1期11卷 98-105页

作者： Shutao He (1) heshutao6105@*** Yao Zhao (1) School of Naval Architecture and Ocean Engineering Huazhong University of Science and Technology

The cylindrical shell is one of the main structural parts in ocean engineering *** cylinders are mostly of medium length,which means that the radius of the cross section is significantly smaller than the length of the cylindrical *** the viewpoint of the shell theory,they belong to the mid-long cylindrical shell *** solve mechanical problems on this kind of structure,especially a cracked cylindrical shell,analysis based on shell theory is *** present the generally used solving system for the mid-long cylindrical shell is too complicated,difficult to solve,and inapplicable to *** paper introduced the Sanders' mid-long cylindrical shell theory which reduces the difficulty of the solution process,and will be suitable for solving problems with complicated boundary *** this basis,the engineering applications of this theory were discussed in conjunction with the problem of a mid-long cylindrical shell having a circumferential *** solution process is simple,and the closed form solution can usually be *** practical engineering applications,it gives satisfactory precision.

关键词： mid-long cylindrical shell cylindrical shell theory circumferential crack ocean engineeringstructure

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