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余热排出系统管道热疲劳裂纹萌生方向的理论和数值研究 被引量:1
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作者 雷柏茂 万力 +3 位作者 何觅 吴莘馨 周羽 宋宇 《原子能科学技术》 EI CAS CSCD 北大核心 2015年第4期713-718,共6页
在压水堆核电站余热排出系统冷热水混合区管道发现了由热疲劳导致的不同方向的浅裂纹群,疲劳裂纹的萌生方向可根据临界面方向进行预测。本文对临界面方向进行了理论推导,得出了双轴疲劳载荷作用下临界面方向的解析解。基于C++语言开发... 在压水堆核电站余热排出系统冷热水混合区管道发现了由热疲劳导致的不同方向的浅裂纹群,疲劳裂纹的萌生方向可根据临界面方向进行预测。本文对临界面方向进行了理论推导,得出了双轴疲劳载荷作用下临界面方向的解析解。基于C++语言开发了临界面方向的分析程序,同时采用C++开发的分析程序和有限元软件Code_Aster计算了临界面方向,并将计算结果与理论解析解进行了对比验证。临界面方向分析结果与余热排出系统管道中发现的热疲劳裂纹方向吻合。研究表明,余热排出系统管道焊接残余应力对热疲劳裂纹萌生方向具有决定性的作用。 展开更多
关键词 热疲劳裂纹 焊接残余应力 临界面方向 裂纹萌生方向
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A Method Combining Numerical Analysis and Limit Equilibrium Theory to Determine Potential Slip Surfaces in Soil Slopes 被引量:6
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作者 XIAO Shiguo YAN Liping CHENG Zhiqiang 《Journal of Mountain Science》 SCIE CSCD 2011年第5期718-727,共10页
This paper describes a precise method combining numerical analysis and limit equilibrium theory to determine potential slip surfaces in soil slopes. In this method, the direction of the critical slip surface at any po... This paper describes a precise method combining numerical analysis and limit equilibrium theory to determine potential slip surfaces in soil slopes. In this method, the direction of the critical slip surface at any point in a slope is determined using the Coulomb’s strength principle and the extremum principle based on the ratio of the shear strength to the shear stress at that point. The ratio, which is considered as an analysis index, can be computed once the stress field of the soil slope is obtained. The critical slip direction at any point in the slope must be the tangential direction of a potential slip surface passing through the point. Therefore, starting from a point on the top of the slope surface or on the horizontal segment outside the slope toe, the increment with a small distance into the slope is used to choose another point and the corresponding slip direction at the point is computed. Connecting all the points used in the computation forms a potential slip surface exiting at the starting point. Then the factor of safety for any potential slip surface can be computed using limit equilibrium method like Spencer method. After factors of safety for all the potential slip surfaces are obtained, the minimum one is the factor of safety for the slope and the corresponding potential slip surface is the critical slip surface of the slope. The proposed method does not need to pre-assume the shape of potential slip surfaces. Thus it is suitable for any shape of slip surfaces. Moreover the method is very simple to be applied. Examples are presented in this paper to illustrate the feasibility of the proposed method programmed in ANSYS software by macro commands. 展开更多
关键词 Soil slope Stress field Potential slip surface Slope stability Factor of safety Numerical analysis Limit equilibrium method ANSYS software
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