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《Engineering Mechanics》 2017-12
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QIN Hong-yuan;HUANG Dan;LIU Yi-ming;ZHANG Qing;Department of Engineering Mechanics, Hohai University;  
To improve the calculation accuracy of peridynamics and eliminate the limitations of the commonly-used Prototype Microelastic Brittle(PMB) peridynamic model, an extended micropolar peridynamic constitutive model has been developed, which can describe the internal length effect of non-local long-range forces and the mechanical properties of brittle materials such as rock and concrete. The corresponding peridynamic numerical system suitable for simulating multiple crack propagation in brittle materials has been proposed as well. The quantitative calculation accuracy of the proposed model has been verified, and the kernel function with the highest accuracy has been confirmed through the deformation analysis of a cantilever beam. The model and numerical methods are employed to simulate multiple crack growth in brittle plates subjected to uniaxial tension and compression, and the numerical results agree well with previous studies. The influence of initial angles, initial lengths of cracks on the failure mode and failure load of three-point bending beams has been investigated.
【Fund】: 国家自然科学基金项目(51679077 11132003);; 中央高校基本科研业务费项目(2015B18314);; “NSFC-广东联合基金(第二期)超级计算科学应用研究专项”项目;; 国家超级计算广州中心项目
【CateGory Index】: O346.1
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