DETERMINATION OF STRESS INTENSITY FACTOR USING DIGITAL IMAGE CORRELATION METHOD

Burcu Taşdemir
856 1.115

Abstract


Fracture and failure characterization of materials have been a crucial issue regarding reliable structural design. Stress intensity factor (SIF) is one of the most commonly used material parameters for this purpose. This study utilized single edge-notch bend (SENB) test to determine mode-I SIF of polycarbonate (MAKROLON) material. Force, displacement and images of the near crack tip region were simultaneously recorded during the tests. In addition, digital image correlation (DIC) technique was successfully employed to obtain full field measurement of displace-ments and strains in the vicinity of the crack tip. The mode-I stress intensity factor was then calculated from the crack surface displacements obtained experimentally from DIC measurements and the results were verified by empirical formulas that use boundary loads. The DIC method can be useful for determining SIFs for complicated geometries where no handbook values exist in the literature.

Keywords


Fracture mechanics, Experimental mechanics, Digital image correlation, Stress intensity factor

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References


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