Abstract
A strain gage hybrid method is described for determining individual stresses on the boundary and in the neighborhood of cutouts in orthotropic composites. Results agree with independent measurements and finite element analysis. Few measured strain data are needed, and the measured strains originate away from the hole. Ability to determine the stresses on the edge of a cutout from nonboundary measurements recognizes the difficulties in obtaining reliable measurements very near an edge while circumventing the challenge of attempting to bond gages to the transverse curved surface of a small hole or notch. The method also alleviates the problem of not knowing a priori where the most serious stress will occur on the geometric boundary and, hence, where to locate strain gages.
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Baek, T.H., Rowlands, R.E. Hybrid stress analysis of perforated composites using strain gages. Experimental Mechanics 41, 195–203 (2001). https://doi.org/10.1007/BF02323197
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DOI: https://doi.org/10.1007/BF02323197