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Theoretical prediction for effective properties and progressive failure of textile composites:a generalized multi-scale approach

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Acta Mechanica Sinica 2021年第8期37卷 1222-1244,I0001页

作者： Haoyuan Dang Peng Liu Yinxiao Zhang Zhenqiang Zhao Liyong Tong Chao Zhang Yulong Li Department of Aeronautical Structure Engineering Northwestern Polytechnical UniversityXi’an 710072 China 2 Shaanxi Key Laboratory of Impact Dynamics and Its Engineering Applications Xi’an 710072 China 3 Joint International Research Laboratory of Impact Dynamics and Its Engineering Applications Xi’an 710072 China 4 School of Science Harbin Institute of TechnologyShenzhen 518055 China 5 School of Aerospace Mechanical and Mechatronic EngineeringThe University of SydneySydneyNSW 2006Australia

A generalized analytical model is developed to predict progressive failure behavior of several types of textile composites,including plain weave composites,twill weave composites,two-dimensional tri-axially braided composites and warpreinforced 2.5-dimensional braided composites.In this model,the unit cell(UC)of composite is firstly identified and reconstructed into a refined lamina structure with multiple equivalent lamina elements(ELEs)based on apt geometrical approximation and assumptions.Secondly,two-way coupled stress-strain responses within the UC(macro-scale)and ELE(meso-scale)are established through a universal series-parallel model(SPM).Finally,a progressive damage model,which consists of damage initiation criteria and a stiffness evolution strategy,is employed to predict damage behavior of the ELE.The analytical results including mechanical properties and progressive failure process are validated against the existing numerical and experimental ones in literature.The validated analytical model is then used to study the effects of global fiber volume fraction,braided angle,shear failure coefficient and selected failure criteria on stiffness,strength and failure process.The present results demonstrate the efficiency and generic capability of the present analytical model for predicting the mechanical responses of a range of textile composites.

关键词： Textile composites Analytical model series-parallel model Damage mechanics Strength

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A Method to Solve the Impact of Aggregating Benefit and Cost in MCDA

A Method to Solve the Impact of Aggregating Benefit and Cost...

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第24届中国控制与决策会议

作者： Wei CAI, Lei ZHU Institute of Communications Engineering, PLAUST Nanjing210007, China

Multi-criteria decision-making （MCDM） involve the ranking of a finite set of alternatives in terms of a finite number of decision criteria. Often times the ranking is credible. But, when we involve both benefit and cost in an MCDM problem, there may be in conflict with each other. Although this is a frequent characteristic of many real-life MCDM problems, this subject has not been paid adequate attention in the literature. In order to solve the problem of the Impact of Aggregating Benefit and Cost, a method on series-parallel model is proposed, which will get a more reasonable result to help us in decision-marking.

关键词： Analytic hierarchy process （AHP） benefit and cost series-parallel model multi-criteria decision analysis （MCDA）

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