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Peridynamic Meso-scale Modeling for Degradation in Transverse Mechanical Properties of Composites with micro-void Defects

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Acta Mechanica Solida Sinica 2022年第5期35卷 813-823页

作者： Jiayue Wang Yin Yu Zhongcheng Mu Yile Hu Aerospace Structure Research Center School of Aeronautics and AstronauticsShanghai Jiao Tong UniversityShanghai200240China School of Aeronautics and Astronautics Shanghai Jiao Tong UniversityShanghai200240China

The effect of micro-void on transverse stiffness and strength for fiber-reinforced composites subjected to load perpendicular to fiber is studied using the state-based peridynamic(PD)*** heterogeneous microstructure with micro-voids are discretized with irregular and non-uniform grids on *** PD representative volume element with randomly distributed and sized micro-voids has been established with periodic boundary conditions.A parametric study was performed to evaluate the effects of void fraction and void size on transverse *** was found that the transverse modulus decreases with the void fraction in the range of 0.5–2%.A smaller void has a greater impact on the transverse modulus than a larger void under the same void *** crack growth path for the multi-fiber model subjected to transverse tension was *** PD predictions show that cracks initiate at the interface between fiber and matrix,then deflect to the micro-voids *** PD predictions match well with the analytical and experimental observations available in the literature.

关键词： State-based peridynamics micro-void Non-uniform discretization Periodic boundary condition Transverse mechanical property

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Interlayer engineering for titanium clad steel by hot roll bonding

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Journal of Iron and Steel Research International 2018年第7期25卷 739-745页

作者： Xi-yang Chai Tao Pan Feng Chai Xiao-bing Luo Hang Su Zhi-gang Yang Cai-fu Yang Department of Structural Steels Central Iron and Steel Research Institute Beijing 100081 China School of Materials Science and Engineering Tsinghua University Beijing 100084 China

Hot roll bonding was carried out between commercially pure titanium TA2 and high-strength low-alloy steel Q390 using pure Nb or Mo interlayer at 950 ~C with a total reduction ratio of 86.7%. Interfacial microstructure and bonding properties of titanium clad steel plates were investigated by electron microscopy and mechanical tests. The results showed β-Ti, TiC and Fe2Ti reaction phases were generated at Ti/steel interface for the clad plates with no interlayer. Inserting Nb or Mo interlayer can effectively suppress the formation of brittle phases, while the weak bonding joint transferred to Nb/steel or Mo/steel interface. And some micro-voids were found at the interface of Nb/steel and Mo/steel. The improved shear strength of clad plates with Nb interlayer might be attributed to the elimination of brittle phases at bonding interface. The small size and little quantities of the micro-voids at Nb/steel interface had a relatively weak effect on shear strength. However, the large number and big size of micro-voids were responsible for the degradation of shear strength for the clad plates with Mo interlayer.

关键词： Titanium clad steel Interlayer - Interfacial microstructure Brittle phase micro-void

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void damage evolution of LF6 aluminum alloy welded joints under external load and thermal cycling conditions

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Transactions of Nonferrous Metals Society of China 2010年第10期20卷 1968-1973页

作者：米国发赵大为董翠粉牛济泰金成 School of Materials Science and Engineering Henan Polytechnic University School of Materials Science and Engineering Harbin Institute of Technology School of Materials Science and Engineering Dalian Jiaotong University

Based on the simulated aerospace thermal cycling tests,the effect of thermal cycle on the void damage evolution mechanism of LF6 aluminum alloy welded joint was *** results show that micro-voids form around the second phase particles under the thermal cycling *** thermal stress coupled with external stress leads to dislocations pile-up around the particles,and when the dislocation density reaches a certain degree,the stress concentration will exceed the bonding strength at the interface between particles and matrix,resulting in the formation of *** numerical simulation is successfully implemented with the finite element to describe the void damage evolution of the welded joint under thermal cycling conditions.

关键词： aluminum alloy welded joint thermal stress numerical simulation micro-void

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Improvement of Hole-Expansion Property for Medium Carbon Steels by Ultra Fast Cooling After Hot Strip Rolling

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Journal of Iron and Steel Research International 2013年第6期20卷 25-32页

作者： WANG Bin LIU Zhen-yu ZHOU Xiao-guang WANG Guo-dong State Key Laboratory of Rolling and Automation Northeastern University

The improvement of hole-expansion properties for medium carbon steels by ultra fast cooling （UFC） after hot strip rolling was *** was found that finely dispersed spherical cementite could be formed after ultra fast cooling , coiling and annealing *** strength of the steel after annealing was measured to be about *** hole-expansion test , cracks were observed in the edge region around the punched hole because necking or cracking took place when tangential elongation exceeded the forming *** were mainly formed by the coalescence of *** and homogeneous microstructure comprised of ferrite and spheroidized cementite could increase elongation values of the tested sheets by suppressing the combination of the adjacent micro-voids , resulting in the improved hole-expansion property.

关键词： hole-expansion property medium carbon steel ultra fast cooling ( UFC ) spheroidized cementite micro-void

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