Over-deterministic method: The influence of rounding numbers on the accuracy of the values of Williams’ expansion terms

Ruzicka, Vladimir; Malíková, Lucie; Seitl, Stanislav

doi:10.3221/igf-esis.42.14

Cited by 4 publications

(1 citation statement)

References 19 publications

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“…In the framework of LEFM, SIF could be evaluated by means of numerical overdetermined algorithm together with the obtained experimental data. 14,20,21 When compared with other procedures, the overdeterministic approach possesses the advantage of using an unlimited number of data points. As a result, errors can be minimized and the accuracy of calculations amplified.…”

Section: Introductionmentioning

confidence: 99%

Compact tension fracture specimen: Experimental and computational implementations on stress intensity factor

Farahani

Tavares

Belinha

et al. 2018

The Journal of Strain Analysis for Engineering Design

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This work concentrates on the characterization of the stress intensity factor range for a compact tension specimen tested under a uniaxial tensile fatigue loading condition. The experimental solution is obtained using a threedimensional full-field optical technique, digital image correlation. The deformation field is measured and documented for distinct crack lengths. As a relevant fracture parameter, stress intensity factor is thus experimentally measured combined with a computational overdeterministic algorithm for different crack lengths. Moreover, to verify the performance of the proposed fracture model, the cracked compact tension specimen is elasto-statically resolved using advanced discretization techniques, such as the finite element method, the meshless radial point interpolation method and the meshless natural neighbour radial point interpolation method. The finite element method model is thereby analysed with ABAQUS Ó to enable computation of mode I stress intensity factor results based on strain energy release rate criterion for different crack measurements in addition to strain contours. Likewise, the resolution pattern is repeated for meshless methods, and analogous numerical solutions are thus obtained. Overall, the experimental and numerical stress intensity factor results are compared with an available solution (ASTM E647) exhibiting a reasonable agreement. The novelty of this investigation is the amalgamation of an experimental digital image correlation procedure with a computational overdeterministic algorithm and, most importantly, the meshless formulation performance in the linear elastic fracture mechanics.

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Section: Introductionmentioning

confidence: 99%