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micromechanical analysis of In-Plane Constraint Effect on Local Fracture Behavior of Cracks in the Weakest Locations of Dissimilar Metal Welded Joint

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Acta Metallurgica Sinica(English Letters) 2017年第9期30卷 840-850页

作者： Jie Yang School of Energy and Power Engineering University ofShanghai for Science and TechnologyShanghai 200093China

In this work, a set of GTN （Gurson-Tvergaard-Needleman） parameters of the Alloy52M dissimilar metal welded joint （DMWJ） have been calibrated, and a micromechanical analysis of in-plane constraint effects on the local fracture behavior of two cracks, which located in the weakest regions of the DMWJ, has been investigated by the local approach based on the GTN damage model. The results show that the partition of the material and the variation of the q2 parameter make the J-resistance curves obtained by numerical simulations close to the experimental values. The numerical J-resistance curves and crack growth paths are consistent with the experiment results, which show that the GTN damage model can incorporate the in-plane constraint effect. Furthermore, after the stress, strain and damage fields at the crack tip during the crack propagation process have been calculated, and the change of the J-resistance curves, crack growth paths and fracture mechanism with in-plane constraint have been analyzed.

关键词： micromechanical analysis In-plane constraint Fracture behavior Dissimilar metal weldedjoint GTN (Gurson-Tvergaard-Needleman) damage model

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micromechanical analysis on tensile properties prediction of discontinuous randomized zalacca fibre/high-density polyethylene composites under critical fibre length

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Theoretical & Applied Mechanics Letters 2020年第1期10卷 57-65页

作者： Dody Ariawan Eko Surojo Joko Triyono Ibrahim Fadli Purbayanto Agil Fitri Pamungkas Aditya Rio Prabowo Department of Mechanical Engineering Universitas Sebelas MaretSurakarta 57126Indonesia

In this research,the tensile properties'performance of compression moulded discontinuous randomized zalacca fibre/high-density polyethylene under critical fibre length was analysed by means of experimental method and micromechanical *** investigations were used to verify the tensile properties models toward the effect of fibre length and volume fraction on the *** experimental results showed that the tensile properties of composites had significantly increased due to the enhancement of fibre *** the contrary,a decline in the tensile properties was observed with the increase of volume fraction.A comparison was made between the available experimental results and the performances of Tsai-Pagano,Christensen and Cox-Krechel models in their prediction of composites elastic *** results showed that the consideration of fibre's elastic anisotropy in the Cox-Krenchel model had yielded a good prediction of the composites modulus,nevertheless the models could not accurately predict the composites modulus for fibre length study.

关键词： Zalacca fibre micromechanical analysis High-density polyethylene Critical fibre length Tensile properties

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ANISOTROPIC　EFFECTS　OF　QUASI－ISOTROPIC　COMPOSITES（II）──APPLICATIONS　AND　MICRO－MECHANICAL　analysis

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Applied Mathematics and Mechanics(English Edition) 1996年第10期17卷 933-938页

作者：方辉宇郑泉水 Department of Engineering Mechanics Qinghua University Beijing P. R. China

Up to now the analysis on aisnotropic effects of quasi-isotropic composites to material structures has not been found in literatures. In the present paper the strength model for triaxial woven materials proposed in Part (I)[1]is applied to study the problems of an infintiely large plate of triaxial woven material containing either an either an elliptic hole or a crack. TO the elliptic hole problem the remote coritical loading as a function of the geometric parameters of woven materials is analysed and to the crack problem, the cracking orientation is examined. Finally the elasticity and strength models for a triaxial woven material proposed in Part (I)are verfied in terms of micromechanical analysis.

关键词： quasi-isotropy elliptic hole crack anisotropic effects micromechanical analysis

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