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An adaptive finite element procedure for crack propagation analysis

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2007年第2期8卷 228-236页

作者： ALSHOAIBI Abdulnaser M. HADI M.S.A. ARIFFIN A.K. Department of Mechanical & Materials Engineering Universiti Kebangsaan Malaysia 43600 Bangi Selangor Darul Ehsan Malaysia

This paper presents the adaptive mesh finite element estimation method for analyzing 2D linear elastic fracture problems. The mesh is generated by the advancing front method and the norm stress error is taken as a posteriori error estimator for the h-type adaptive refinement. The stress intensity factors are estimated by a displacement extrapolation technique. The near crack tip displacements used are obtained from specific nodes of natural six-noded quarter-point elements which are generated around the crack tip defined by the user. The crack growth and its direction are determined by the calculated stress intensity factors. The maximum circumference theory is used for the latter. In evaluating the accuracy of the estimated stress intensity factors, four cases are tested consisting of compact tension specimen, three-point bending specimen, central cracked plate and double edge notched plate. These were carried out and compared to the results from other studies. The crack trajectories of these specimen tests are also illustrated.

关键词： linear elastic fracture mechanics Adaptive refinement Stress intensity factors Crack propagation

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Probabilistic analysis of linear elastic cracked structures

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2007年第11期8卷 1795-1799页

作者： AKRAMIN M.R.M. ALSHOAIBI Abdulnaser HADI M.S.A. ARIFFIN A.K. MOHAMED N.A.N. Department of Mechanical and Materials Engineering Universiti Kebangsaan Malaysia Bangi 43600 Selangor Darul Ehsan Malaysia

This paper presents a probabilistic methodology for linear fracture mechanics analysis of cracked structures. The main focus is on probabilistic aspect related to the nature of crack in material. The methodology involves finite element analysis; sta- tistical models for uncertainty in material properties, crack size, fracture toughness and loads; and standard reliability methods for evaluating probabilistic characteristics of linear elastic fracture parameter. The uncertainty in the crack size can have a significant effect on the probability of failure, particularly when the crack size has a large coefficient of variation. Numerical example is presented to show that probabilistic methodology based on Monte Carlo simulation provides accurate estimates of failure prob- ability for use in linear elastic fracture mechanics.

关键词： Probabilistic fracture mechanics linear elastic fracture mechanics Failure probability First-order reliability methods

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Microstructure and mechanical properties of lost foam cast 356 alloys

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China Foundry 2015年第3期12卷 214-221页

作者： Qi-gui Wang Materials Technology Global Powertrain Engineering General Motors Company

Microstructure and mechanical properties of lost foam cast aluminum alloys have been investigated in both primary A356(0.13% Fe) and secondary 356(0.47%). As expected, secondary 356 shows much higher content of Fe-rich intermetallic phases, and in particular the porosity in comparison with primary A356. The average area percent and size(length) of Fe-rich intermetallics change from about 0.5% and 6 μm in A356 to 2% and 25 μm in 356 alloy. The average area percent and maximum size of porosity also increase from about 0.4% and 420 μm to 1.4% and 600 μm, respectively. As a result, tensile ductility decreases about 60% and ultimate tensile strength declines about 8%. Lower fatigue strength was also experienced in the secondary 356 alloy. Low cycle fatigue(LCF) strength decreased from 187 MPa in A356 to 159 MPa in 356 and high cycle fatigue(HCF) strength also declined slightly from 68 MPa to 64 MPa.

关键词： lost foam casting aluminum alloys microstructure mechanical properties fatigue Weibull linear elastic fracture mechanics 356 alloy

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