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Probabilistic control volume method for Evaluating the Effects of Notch Size and Loading Type on Fatigue Life

Acta Mechanica Solida Sinica 2020年第2期33卷 141-149页

作者： Chunming Li Zheng Hu Chengqi Sun Qingyuan Song Wanhao Zhang China North Vehicle Research Institute Beijing 100072China State Key Laboratory of Nonlinear Mechanics Institute of MechanicsChinese Academy of SciencesBeijing 100190China School of Engineering Sciences University of Chinese Academy of SciencesBeijing 100049China

The probabilistic control volume method has great prospects in correlating the effects of specimen size,notch and loading type on fatigue life or fatigue *** this work,the effects of notch size and loading type on fatigue life are investigated by using the probabilistic control volume *** bending and axial loading fatigue te«t«are at first performed on the hourglass specimen,circumferential V-notch specimen and V-notch plate specimen of 30CrMnSiA *** results indicate that the notch reduces the fatigue strength of specimens in terms of nominal stress amplitude while in terms of local stress amplitude,the notch specimen could endure higher fatigue ***,the probabilistic control volume method is used to evaluate the effects of notch size and loading type on fatigue *** is shown that the probabilistic control volume method correlates well the effects of notch size and loading type on fatigue life,even for the local stress of the notch root exceeding the yield stress of the material.

关键词： 30CrMnSiA steel Notch size Loading type Fatigue life control volume method

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A simple analytical method for deflation prediction of inflatable structures

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Journal of Central South University 2015年第6期22卷 2277-2286页

作者：李庆松卿强龚景海 Department of Civil Engineering Shanghai Jiao Tong University

The static performance of inflatable structures has been well studied and the dynamic deployment simulation has received much attention. However, very few studies focus on its deflation behavior. Although there are several dynamic finite element algorithms that can be applied to the deflation simulation, their computation costs are expensive, especially for large scale structures. In this work, a simple method based on classic thermodynamics and the analytical relationship between air and membrane was proposed to efficiently analyze the air state variables under the condition of ventilation. Combined with failure analysis of static bearing capacity, a fast incremental analytical method was presented to predict both elastic and post wrinkling deflation process of inflatable structures. Comparisons between simplified analysis, dynamic finite element simulation, and a full-scale experimental test are presented and the suitability of this simple method for solving the air state and predicting the deflation behavior of inflatable structures is proved.

关键词： inflatable structure deflation wrinkling simulation control volume method

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Simulation of cottonseed cake melt flow in metering zone of a single screw extruder

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Frontiers of Chemical Science and Engineering 2010年第3期4卷 263-269页

作者： Hong HE Jianguo ZHOU Beijing University of Chemical and Technology Beijing 100029China

Research on the extrusion of natural polymers(food,feed,etc.)is relatively new due to the complex physicochemical transformations of raw materials,although plastics melt conveying and transport have been well *** structure and composition,rheological behavior as well as extrusion processing of natural polymer are much more *** this study,a quasi-three-dimensional(3D)fluid flow model for non-Newtonian,non-isothermal and undeveloped temperature was developed,the model prediction being in reasonably good agreement with the *** show that the influence of moisture content,among other process variables,is the most significant,followed by screw *** interaction exists between these two variables and the screw speed effect becomes marginal at high moisture *** addition,viscosity change in the channel was studied.

关键词： Cottonseed cake single screw extruder simulation control volume method metering zone

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General Governing Equations and Numerical Solution method in Electromagnetics and Fluid Mechanism

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Journal of Iron and Steel Research International 2012年第S1期19卷 167-170页

作者： LEI Hong GENG Dian-qiao CHEN Zhi-hui HE Ji-cheng Key Laboratory of Electromagnetic Processing of Materials Ministry of EducationNortheastern University

Based on an analogy among the governing equations among the electrostatic field,static magnetic field and fluid flow,all these equations can be expressed by a general differential equation,and the control volume method,which has been widely used in computational fluid dynamics,was developed to solve all these *** results showed that control volume method is a successful numerical in the computational fluid dynamics and the electromagnetics,and the upwind(or downwind)scheme have the clear mathematical meaning and can be applied to calculate the charges' movement in the electrostatic field.

关键词： electromagnetic field fluid flow upwind scheme downwind scheme control volume method

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