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LOCAL CHEMISTRY AND THE cohesive strength OF GRAIN BOUNDARIES IN Ni_3Al

Acta Metallurgica Sinica(English Letters) 1995年第Z1期8卷 309-318页

作者： Shanthi Subramanian David Muller John Silcox and Stephen L.Sass (Department of Materials Science and Engineering and Department of Applied and Engineering Physics, Cornell University, Ithaca. NY 14853) Cornell Univ Ithaca United States

Local chemistry plays an important role in determining the cohesive strength of grain boundaries in Ni3Al. Doping with B increases the room temperature ductility and changes the fracture mode from intergranular to transgranular, while doping with Zr increases the ductility but leaves the fracture mode predominantly *** Energy Loss Spectroscopy (EELS) and Energy Dispersive X-ray Spectroscopy (EDS) were used to probe the changes in local bonding (and hence the cohesive strength) produced by changes in local chemistry at large angle boundaries in *** addition , small angle tilt boundaries were studied to correlate structure with Nienrichment at the interface. B segregation to Ni-rich grain boundaries was shown to make the bonding similar to that of the bulk, thereby increasing their fracture resistance. Ni-enrichment does not occur in the presence of Zr segregation to grain boundaries. Ni-enrichment to antiphase boundaries (APB) in small angle tilt boundaries lowers the APB energy by reducing the number of high energy Al-Al interactions across the interface. Ni-enrichment to large angle boundaries is expected to produce a similar effect on energy.

关键词： grain boundary chemistry Ni3Al local bonding cohesive strength

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Delamination analysis of woven fabrication laminates using cohesive zone model

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Journal of Central South University 2016年第1期23卷 27-38页

作者： Mohsen Moslemi Mohammadreza Khoshravan azar Department of Mechanical Engineering University of Tabriz

A new test method was proposed to evaluate the cohesive strength of composite laminates. cohesive strength and the critical strain energy for Mode-II interlamiar fracture of E-glass/epoxy woven fabrication were determined from the single lap joint(SLJ) and end notch flexure(ENF) test, respectively. In order to verify their adequacy, a cohesive zone model simulation based on interface finite elements was performed. A closed form solution for determination of the penalty stiffness parameter was proposed. Modified form of Park-Paulino-Roesler traction-separation law was provided and conducted altogether with trapezoidal and bilinear mixed-mode damage models to simulate damage using Abaqus cohesive elements. It was observed that accurate damage prediction and numerical convergence were obtained using the proposed penalty stiffness. Comparison between three damage models reveals that good simulation of fracture process zone and delamination prediction were obtained using the modified PPR model as damage model. cohesive zone length as a material property was determined. To ensure the sufficient dissipation of energy, it was recommended that at least 4 elements should span cohesive zone length.

关键词： cohesive zone model delamination cohesive strength finite element prediction

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Mechanism from particle compaction to fluidization of liquid–solid two-phase flow

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Chinese Physics B 2020年第1期29卷 373-377页

作者： Yue Zhang Jinchun Song Lianxi Ma Liancun Zheng Minghe Liu School of Mechanical Engineering and Automation Northeastern UniversityShenyang 110819China Department of Physics Blinn CollegeBryanTX 77805USA School of Mathematics and Physics of University of Science and Technology Beijing Beijing 100083China School of Mechanical Engineering Shenyang Jianzhu UniversityShenyang 110168China

A new model of particle yield stress including cohesive strength is proposed,which considers the friction and cohesive strength between particles.A calculation method for the fluidization process of liquid–solid two-phase flow in compact packing state is given,and the simulation and experimental studies of fluidization process are carried out by taking the sand–water two-phase flow in the jet dredging system as an example,and the calculation method is verified.

关键词： liquid–solid flow two-phase flow cohesive strength yield stress

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