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stretch rate and deformation for pre-stretching aluminum alloy sheet

Journal of Central South University 2012年第4期19卷 875-881页

作者：朱才朝罗家元 State Key Laboratory of Mechanical Transmission Chongqing University China Automotive Engineering Research Institute Co. Ltd.

Numerical simulation combined with experimental test was carried out to analyze the pre-stretching process of the 7075 aluminum alloy sheet,from which the stress variation curves and residual stress of aluminum alloy sheet in different stretch rates were *** results show that the residual stress in length direction is released after unloading the stretch force,while the residual stress in width direction is released during the stretching *** study of residual stress elimination is beneficial for optimizing stretch rate on the basis of residual stress distribution *** comparing the variation principle of residual stress in length direction,the size range of three deformation areas and elimination percentage of residual stress were *** residual stresses of clamping area and transition area are not eliminated effectively,so sawing quantity should be the sum of both the *** elimination rate of residual stress in even deformation area could reach 90% after choosing a proper stretch rate,which is verified by both simulation and experiment.

关键词： residual stress stretch rate defonnation area sawing quantity

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Asymptotic analysis of outwardly propagating spherical flames

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Acta Mechanica Sinica 2012年第2期28卷 359-366页

作者： Yun-Chao Wu Zheng Chen State Key Laboratory for Turbulence and Complex SystemsDepartment of Mechanics and Aerospace Engineering Department of Aeronautics and AstronauticsCollege of EngineeringPeking University100871 BeijingChina

Asymptotic analysis is conducted for outwardly propagating spherical flames with large activation energy. The spherical flame structure consists of the preheat zone, reaction zone, and equilibrium zone. Analytical solutions are separately obtained in these three zones and then asymp- totically matched. In the asymptotic analysis, we derive a correlation describing the spherical flame temperature and propagation speed changing with the flame radius. This cor- relation is compared with previous results derived in the limit of infinite value of activation energy. Based on this correla- tion, the properties of spherical flame propagation are inves- tigated and the effects of Lewis number on spherical flame propagation speed and extinction stretch rate are assessed. Moreover, the accuracy and performance of different mod- els used in the spherical flame method are examined. It is found that in order to get accurate laminar flame speed and Markstein length, non-linear models should be used.

关键词： Propagating spherical flames Asymptotic anal- ysis Lewis number stretch rate

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