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Al/Hf ratio-dependent mechanisms of microstructure and mechanical property of nearly fully dense Al—Hf reactive material

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Defence Technology（防务技术） 2024年第1期31卷 230-241页

作者： Junbao Li Weibing Li Xiaoming Wang ZNDY of Ministerial Key Laboratory Nanjing University of Science and TechnologyNanjing 210094China

This study proposed three types of Al—Hf reactive materials with particle size ratios(a),which were almost completely dense(porosity of<5.40%)owing to their preparation using hot-pressing *** characteristics and phas... 详细信息

This study proposed three types of Al—Hf reactive materials with particle size ratios(a),which were almost completely dense(porosity offailure strainεfincreasing approximately linearly with increasing strain rate.ε.It is found that the plastic deformation of the material increased with increasing strain *** a increased from 0.1 to 1,the flow stress gradually *** failure of the material was dominated by ductile fracture with a large Al phase plastic deformation band for lower a,while brittle fracture with crushed Hf particles occurred at higher ***,a constitutive model based on BP neural network was proposed to describe the stress-strain relationships of the materials,with an average relative error of 2.22%.

关键词： Reactive material Particle size Split Hopkinson pressure bar test Stressestrain relationship impact failure BP neural network

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Modelling of Contact Damage in Brittle Materials Based on Peridynamics

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Computer Modeling in Engineering & Sciences 2021年第11期129卷 519-539页

作者： Jingjing Zhao Guangda Lu Qing Zhang Wenchao Du Nanjing Institute of Railway Technology Nanjing210031China Tongji University Shanghai200092China Department of Engineering Mechanics Hohai UniversityNanjing211100China Nanjing High Speed Gear Manufacturing Co. Ltd.Nanjing211100China

As a typical brittle material,glass is widely used in construction,transportation,shipbuilding,aviation,aerospace and other *** unsafe factors of glass mainly come from its ***,establishing a set of prediction models for the cracks growth of glass under dynamic load is *** paper presents a contact damage model for glass based on the ordinary state-based peridynamic theory by introducing a contact force *** Hertz contact(nonembedded contact)problem is simulated,and the elastic contact force is determined by adjusting the penalty *** proposed model verifies the feasibility of penalty-based method to simulate the contact problem of *** failure process of glass specimen under impact is simulated,where two loading methods,the drop ball test and the split Hopkinson pressure bar are *** results agree well with the experimental observations,thereby verifying the effectiveness of the proposed model.

关键词： The ordinary state-based peridynamic glass numerical simulation contact damage impact failure

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