Home / Journals / ICCES / Vol.1, No.2, 2007
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  • Open Access

    ABSTRACT

    Impact Damage Detection in Composite Sandwich Structures by Low Frequency Lamb Waves

    C. Soutis1, K. Diamanti1
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.1, No.2, pp. 49-54, 2007, DOI:10.3970/icces.2007.001.049
    Abstract A cost and time effective inspection strategy for in-service health monitoring of composites is demonstrated using the fundamental anti-symmetric A0 Lamb mode at frequencies of 15-20 kHz. In principle, this method involves analysis of the transmitted and/or reflected wave after interacting with the test-piece boundaries or discontinuities (defects). In the present work, the applicability of the technique to composite sandwich structures is explored. More >

  • Open Access

    ABSTRACT

    Extension of Fictitious Crack Model to Self-Affine Cracks

    B.K. Raghu Prasad1, Renuka Devi M.V.2
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.1, No.2, pp. 55-60, 2007, DOI:10.3970/icces.2007.001.055
    Abstract The concepts associated with concrete crack formation and propagation is discussed in the light of fractal and probability theories. These concepts are employed to model the tortuous crack path in a highly heterogeneous medium of concrete. Fictitious Crack Model (FCM)[1] is extended to analyze plain concrete beams with such tortuous cracks. The parametric study has been carried out in order to obtain the influence of various fracture parameters on the beam response. More >

  • Open Access

    ABSTRACT

    Calculation of Energy Release Rate in Mode I Delamination of Angle Ply Laminated Composites

    K. Gordnian1, H. Hadavinia1, G. Simpson1, A. Aboutorabi1
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.1, No.2, pp. 61-68, 2007, DOI:10.3970/icces.2007.001.061
    Abstract The compliance equation is used to calculate the energy release rate for angle ply laminated double cantilever composite beam specimen. Instead of the traditional approach of a beam on an elastic foundation, a second order shear thickness deformation beam theory (SSTDBT) has been considered. More >

  • Open Access

    ABSTRACT

    Global/Local Fracture Mechanics Analyses of advanced Aerospace Structures

    Milazzo A.1, aimo A.1, Orl,o C.1
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.1, No.2, pp. 69-74, 2007, DOI:10.3970/icces.2007.001.069
    Abstract In this paper a Hierarchical approach for the analysis of advanced aerospace structures is presented. The proposed Global/Local model uses two kind of numerical methods for the different steps of analysis. In particular the first step of the Hierarchical procedure is performed by the Finite Element code Patran/NastranTM, while the local analysis is performed by using a Boundary Element code based on the multidomain anisotropic technique. The accuracy and the effectiveness of the model have been demonstrated analysing classical stress concentration problems. Then the procedure has been used to analyze more complex structure among which a riveted patch repair, applied… More >

  • Open Access

    ABSTRACT

    Evaluation of T-Stress for an Interface Crack Lying Between Dissimilar Anisotropic Solids Using BEM

    P.D. Shah1, C.L. Tan1, X. Wang1
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.1, No.2, pp. 75-80, 2007, DOI:10.3970/icces.2007.001.075
    Abstract The path-independent mutual- or M-integral for the computation of the T-stress for interface cracks lying between dissimilar anisotropic, linear elastic solids is developed in this paper. For the numerical stress analysis, the Boundary Element Method (BEM) is employed and special crack-tip elements with the proper oscillatory traction singularity are used. The successful implementation of the scheme for evaluating the T-stress of an interface crack between anisotropic bi-materials with BEM is demonstrated by numerical examples. More >

  • Open Access

    ABSTRACT

    The Theory of Critical Distances and the estimation of notch fatigue limits: L, a0 and open notches

    L. Susmel1,2, D. Taylor2, R. Tovo1
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.1, No.2, pp. 81-86, 2007, DOI:10.3970/icces.2007.001.081
    Abstract This paper investigates some practical aspects related to the use of the Theory of Critical Distances (TCD) when employed to estimate notch fatigue limits. The accuracy of different formalisations of the theory was checked by using experimental data taken from the literature. This exercise allowed us to confirm that the simplest formalisation of the TCD, in which both critical distance and critical stress are material constants [1], is also the most accurate one, giving predictions falling within an error interval of about ±20%. The TCD is also accurate when applied to notches having large opening angles. More >

  • Open Access

    ABSTRACT

    Probabilistic Modeling of Material Variability in Fatigue Crack Growth

    G. Renaud1, M. Liao1
    The International Conference on Computational & Experimental Engineering and Sciences, Vol.1, No.2, pp. 87-92, 2007, DOI:10.3970/icces.2007.001.087
    Abstract This paper presents a probabilistic crack growth model developed for the Holistic Structural Integrity Process (HOLSIP) framework. Statistical data, obtained from testing and fractographic analyses of 2024-T3 test coupons, were used to derive the fatigue crack growth material variability. Results showed the relative impact of material variability in the short and long crack regimes. Monte Carlo simulations showed good agreement between analytical life distributions and test results. More >

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