Open Access
ABSTRACT
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
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
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
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
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
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
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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