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cyclic stress induced phase transformation in super-bainitic microstructure

Chinese Physics B 2017年第3期26卷 545-549页

作者：修文翠韩英刘澄吴化刘云旭 Key Laboratory of Advanced Structural Materials Ministry of Education Changchun University of Technology School of Mechanical Engineering Jilin Agricultural Science and Technology University College of Mechanical Engineering Yangzhou University

The effects of cyclic stress loading on the microstructual evolution and tensile properties of a medium-carbon super- bainitic steel were investigated. Experimental results show that the cyclic stress can induce the carbon gathering in austenite and phase transformation from film-like retained austenite to twin martensite, which will obviously enhance the tensile strength and the product of tensile strength and ductility. The higher the bainitic transformation temperature, the lower the transformation rate of the retained austenite. The amount and thickness of the film-like retained austenite play an important role during the cyclic stress induced phase transformation.

关键词： super-bainite cyclic stress retained austenite phase transformation

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FRACTIONAL ORDER MODELLING OF THE CUMULATIVE DEFORMATION OF GRANULAR SOILS UNDER cyclic LOADING

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Acta Mechanica Solida Sinica 2015年第6期28卷 647-658页

作者： Yifei Sun Yang Xiao Khairul Fikry Hanif Institute for Mathematics and Its Applications University of Wollongong State Key Laboratory of Coal Mine Disaster Dynamics and Control Chongqing University Key Laboratory of New Technology for Construction of Cities in Mountain Area Chongqing University College of Civil Engineering Chongqing University Faculty of Engineering Computing and MathematicsUniversity of Western Australia

To model the cumulative deformation of granular soils under cyclic loading, a mathematical model was proposed. The power law connection between the shear strain and loading cycle was represented by using fractional derivative approach. The volumetric strain was characterized by a modified cyclic flow rule which considered the effect of particle breakage. All model parameters were obtained by the cyclic and static triaxial tests. Predictions of the test results were provided to validate the proposed model. Comparison with an existing cumulative model was also made to show the advantage of the proposed model.

关键词： cumulative deformation cyclic stress cyclic flow rule fractional derivative granular soil

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Settlement and Stability Analysis on Soft Clay Under cyclic Loading

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China Ocean Engineering 1992年第4期7卷 483-490页

作者： Yan Shuwang , Yang Jinliang Yan Chi Professor, Tianjin University, 300072 TianjinAssoc. Professor, Tianjin University, 300072 Tianjin Lecturer, Tianjin University, 300072 Tianjin

The results of undrained cyclic triaxial tests on three types of clays are collected and a relationship among the accumulated strain, the initial stress state, cyclic stress in the soil, as well as the number of cycles is established based on the experimental data. With this relationship, a procedure is proposed for subsidence and stability analysis on soft clay under the action of cyclic loads.

关键词： soft clay cyclic loading triaxial test accumulated strain cyclic stress

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Optimal slot dimension for skirt support structure of coke drums

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Frontiers of Mechanical Engineering 2018年第4期13卷 554-562页

作者： Edward WANG Zihui XIA Department of Mechanical Engineering University of Alberta Edmonton T6G1H9 Canada

The skirt-to-shell junction weld on coke drums is susceptible to fatigue failure due to severe thermal cyclic stresses. One method to decrease junction stress is to add slots near the top of the skirt, thereby reducing the local stiffness close to the weld. The most common skirt slot design is thin relative to its circumferential spacing. A new slot design, which is significantly wider, is proposed. In this study, thermal-mechanical elastoplastic 3-D finite element models of coke drums are created to analyze the effect of different skirt designs on the stress/strain field near the shell-to-skirt junction weld, as well as any other critical stress locations in the overall skirt design. The results confirm that the inclusion of the conventional slot design effectively reduces stress in the junction weld. However, it has also been found that the critical stress location migrates from the shell-to-skirt junction weld to the slot ends. A method is used to estimate the fatigue life near the critical areas of each skirt slot design. It is found that wider skirt slots provide a significant improvement on fatigue life in the weld and slot area.

关键词： coke drum stress analysis cyclic stress fatigue life skirt slots

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