Home / Journals / ICCES / Vol.1, No.3, 2007
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  • Open Access

    ABSTRACT

    Numerical Analysis of Composite Panels in the Post-Buckling Field taking into account Progressive Failure

    C. Bisagni1
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.1, No.3, pp. 93-98, 2007, DOI:10.3970/icces.2007.001.093
    Abstract The research here presented shows the numerical results for progressive failure of stiffened composite panels into the post-buckling field. In particular, a strength reduction procedure is implemented in the commercial finite element code ABAQUS where the stiffness properties of the material are removed in the failed areas. The results show a good correlation with experimental data obtained from a post-buckling test of a stiffened panel with a notch, that can be found in literature. More >

  • Open Access

    ABSTRACT

    Numerical Simulation of Ductile Fracture Process including Shear-Lip Fracture

    M. Kikuchi1, S. Sannoumaru2
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.1, No.3, pp. 99-104, 2007, DOI:10.3970/icces.2007.001.099
    Abstract Thickness effect is studied experimentally. At free surface of the specimen, shear lip fracture pattern appears, though dimple fracture pattern is observed inside of the specimen. The area of shear-lip fracture changes due to the change of the specimen thickness. In this study, experimental study is conducted by changing specimen thicknesses. Fracture surfaces are precisely observed using SEM, and dimple patterns on them are observed. At the free surface, very narrow no-void area is observed. By using FRASTA technique, dimple fracture process is simulated. It is found that shear-lip fracture appears after dimple fracture process. FEM simulation is carried out… More >

  • Open Access

    ABSTRACT

    Recent Discovery for the Governing Condition of Dynamic Crack Bifurcation Phenomena

    T. Nishioka1
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.1, No.3, pp. 105-112, 2007, DOI:10.3970/icces.2007.001.105
    Abstract This paper summarizes recent discovery for the Governing Condition of Dynamic Crack Bifurcation Phenomena, which were found by the author's laboratory. More >

  • Open Access

    ABSTRACT

    Ultra High-speed Observation of Dynamic Fracture using C. G.S. Methods under Mix-mode Impact Load

    T. Nishioka1, M.Kogame2, T. Fujimoto1, G. Okamoto1
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.1, No.3, pp. 113-118, 2007, DOI:10.3970/icces.2007.001.113
    Abstract In this study, we observed C.G.S. fringe pattern of dynamic fracture under impact load by an ultra high-speed CCD video camera, and stress intensity factors KI, KII are evaluated from the experimental measurements. From the evaluation of stress intensity factors, local mode I condition is observed during crack propagation. On the other hand, concentrated load is obtained by the experimental devices in this study. We suggest the least square method to estimate loading value based on the C.G.S. fringe pattern analyses. More >

  • Open Access

    ABSTRACT

    Moving Finite Element Simulation of Various Fracture Path Prediction in Materials Containing Holes and Inclusions

    Nishioka T.1, sugami M.1, Fujimoto T.1
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.1, No.3, pp. 119-126, 2007, DOI:10.3970/icces.2007.001.119
    Abstract In this paper, the simulations of fatigue crack propagation and dynamic fracture path prediction are carried out for specimens containing circular holes or inclusions, using the moving finite element method based on Delaunay automatic triangulation. And, we compared the numerical results with the experimental results. More >

  • Open Access

    ABSTRACT

    High-precision Path Prediction Simulation of Non-straight and High-speed Propagating Crack

    Nishioka T.1, Fujita N.1, Fujimoto T.1, Kogame M.1
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.1, No.3, pp. 127-132, 2007, DOI:10.3970/icces.2007.001.127
    Abstract In this study, numerical simulations of mixed-mode fracture paths in dynamic fracture phenomenon are carried out by using moving finite element method based on Delaunay automatic mesh generation. In addition, the experiments under same condition was carried out, and the both results were compared. The calculated paths by the simulation agree well with the fracture paths of the experiments. More >

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