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FEM Modeling of Crack Propagation in a Model Multiphase Alloy

Journal of Materials Science & Technology 2006年第1期22卷 59-65页

作者： Lihe QIAN Seishi NISHIDO Hiroyuki TODA Toshiro KOBA YASHI Department of Production Systems Engineering Toyohashi University of Technology Toyohashi 441-8580 Japan IT Promotion Department Aisin Takaoka Co. Ltd. 1 Tennoh Takaokashin-machi Toyota 473-8501 Japan

In this paper, several widely applied fracture criteria were first numerically examined and the crack-tip-region Jntegral criterion was confirmed to be more applicable to predict fracture angle in an elastic-plastic multiphase material. Then, the crack propagation in an idealized an elastic-plastic finite element method. The variation dendritic two-phase AI-7%Si alloy was modeled using of crack growth driving force with crack extension was also demonstrated. It is found that the crack path is significantly influenced by the presence of α-phase near the crack tip, and the crack growth driving force varies drastically from place to place. Lastly, the simulated fracture path in the two-phase model alloy was compared with the experimentally observed fracture path.

关键词： Al-Si alloys fracture criterion fracture path Numerical simulation Finite element method (FEM) Multiphase microstructure

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Effect of connection processes on mechanical properties of 7B04 aluminum alloy structures

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China Welding 2021年第2期30卷 50-57页

作者： Wang Yue Chai Peng Guo Xiaojuan Qi Bojin School of Mechanical Engineering and Automation Beihang UniversityBeijing 100083China Beijing FSW Technology Co.Ltd. AVIC Manufacturing Technology InstituteBeijing 100024China

The static and fatigue properties of 7B04 aluminum alloy structures connected by riveting and refill friction stir spot welding(refill FSSW)were compared and *** show that the static compression load of the typical structure connected by riveting and refill FSSW fluctuated in the range of 117-124 kN,and the shear load was in the range of 89-95 *** spacing had a small influence on the static load of the structures joined by refill ***,the fatigue life of riveted structures was lower than that joined by refill *** the welded structure,the heterogeneous microstructures of the welded joint led to the uneven microhardness,and the hook at the lap interface bent upwards at the same *** factors made the welded structures during the fatigue test failure along the path of sleeve moving.

关键词： refill friction stir spot welding 7B04 aluminum alloy microstructure fatigue life fracture path

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Mechanical response joint under of the TiAl/steel brazed torsional load

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China Welding 2014年第3期23卷 42-47页

作者：李玉龙赵诚冯吉才何鹏 Key Lab for Robot & Welding Automation of Jiangxi Province Mechanical & Electrical Engineering School Nanchang University Nanchang 330031. State Key Laboratory of Advanced Welding and Joining Harbin Institute of Technology Harbin 150001.

An attempt to investigate the mechanical response to the torsional load, torsional tests of TiA1/steel brazed joints were conducted at room temperature. The TiAl/steel joints used in the torsional loading tests were brazed under the optimum parameters of 1 173 K and 300 s. Torsional strength, fracture path and the behavior of the reaction phases were studied. The results show that the average torsional strength of the joints with the diameters of 13mm, 16 mm and 20 mm is 136 N · m, 270 N · m and 490 N · m, respectively; which is 81.9% , 85.5% and 86. 2% of the TiAl base metal, respectively. fracture path and crack propagation process analysis shows, when subjected to the torsional load, Ag-based solid solution is deformed and cracks germinate at the interface of Ag-based solid solutioa/AlCu2 Ti particles or Ag-based solid solution/AlCu2 Ti layers, grow up and propagate into the Al-Cu- Ti brittle reaction layers, then propagate into the TiAl base metal, subsequently result in failure.

关键词： TiAl brazing torsional test fracture path

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