Abstract
The experimental results from the blocks loading fatigue tests are compared with the predictions using the proposed model and Miner's rule. Estimated and experimental results are found to exhibit good agreement. The evaluation technique of the K I stress intensity factors (SIF) by a numerical investigation using line strain method is developed. The main purpose of this research is to estimate 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. Computed values using finite element analysis of stress intensity factors are compared with the experimental and theoretical results. A good agreement is observed between the present approach and experimental data. It is shown that, in the case of a through-plate crack, the stress intensity factor can be measured with a good accuracy using the proposed method.
Highlights
The measurement of the stress intensity factor with strain gages was first suggested by Irwin [1] in 1957
Different strain gage approaches were introduced by Shukla et al [5] and Dally and Sanford [6] to measure the variation of stress intensity factor of a propagating crack
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
Summary
The measurement of the stress intensity factor with strain gages was first suggested by Irwin [1] in 1957. A valid strain gage technique for measuring stress intensity factor KI was first presented by Dally and Sanford [2]. In this method, a valid region was specified for locating the gages to get rid of the elastic-plastic crack-tip state caused by local yielding in the innermost region close to the crack tip. Different strain gage approaches were introduced by Shukla et al [5] and Dally and Sanford [6] to measure the variation of stress intensity factor of a propagating crack
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