Abstract
This paper demonstrates ability to evaluate the stress intensity factor in a double-edge cracked finite [013/905/013] graphite-epoxy orthotropic tensile composite from J-integral and a single digital image correlation recorded displacement field. Relevant stress/strain/displacement information is obtained by processing the measured displacement data with stress functions, conformal mapping and analytical continuation method. A normalized stress intensity factor of 2.05 is determined experimentally for the present geometry, loading and material. Plane-stress is assumed. The technique is not restricted to a laboratory environment and concepts are applicable to other structural shapes, loads and crack configurations. Unlike purely numerical or theoretical approaches, the present method does not require knowing the external loading. This is significant as loads are often unknown in practice. Results are verified independently.
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