Combined experimental and theoretical method of determining the state of stress and strain near holes
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The article suggests a new combined experimental and theoretical method of determining the state of stress and strain next to a cylindrical hole in a plate subjected to uniaxial plane loading in the elastic strain range. The essence of the method consists in the following. By the interferogram of the local component of the normal displacement component of the surface of the plate in the zone of the hole the radius of the cylindrical surface with zero change of the mentioned displacement component, coaxial with the hole, is measured. This radius is used in the theoretical calculation as criterion for establishing the final dimensions of the deformed annular region around the hole, and consequently all the real parameters of the state of stress and strain of the plate in the zone of the hole. The effect of the loading asymmetry in the testing machine on the kind of interferogram under consideration is also taken into account. It is shown that there is good correspondence between the theoretical patterns of levlel bands of equal displacements of the surface of the plate along the normal and the experimental interferograms. The stress concentration factors for a real specimen are determined.
KeywordsElastic Strain Concentration Factor Theoretical Method Strain Range Final Dimension
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