Abstract
An evaluation technique of the KI stress intensity factors (SIF) by a numerical investigation using line strain method is presented in this paper. The main purpose of this research is to re-analyze experimental results of fracture loads from polymethyl-metacrylate (PMMA) specimens (fully finite plates). Stress intensity factor equation calculation is derived from the Williams stress asymptotic expansion. Possible error caused by strain gradients across the gage length is minimized by integrating the equation in the KI calculation. Theoretical and computed values using finite element analysis of stress intensity factors are compared with experimental results. A good agreement is observed between the present approach and experimental values. It is shown that, in the case of a through-plate crack, the stress intensity factor can be calculated with adequate accuracy using the proposed method.
Highlights
All standard paper components have been specified for three reasons: The measurement of the stress intensity factor with strain gages was first suggested by Irwin in 1957 [1]
We investigate the feasibility of the numerical determination of accurate opening mode of stress intensity factors using the Dally–Sanford method [2] for the cracked polymethyl-methacrylate (PMMA) specimens
Thereafter, stress intensity factors (SIF) values were determined by finite elements analysis (Abaqus)
Summary
All standard paper components have been specified for three reasons: The measurement of the stress intensity factor with strain gages was first suggested by Irwin in 1957 [1]. Due to the local yielding effect in the crack vicinity, little progress has been made in implementing Irwin's suggestion. A valid strain gage technique for calculating the stress intensity factor KI was first presented in [2,3,4]. In this method, a valid region was specified for locating the gages to get rid of the elasticplastic crack-tip state caused by local yielding in the innermost region close to the crack tip. An extended over-deterministic approach was later proposed to significantly improve the accuracy [5]
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