The effects of static opening mode loading on orthotropic-orthotropic bimaterial interface cracks and isotropic-orthotropic bimaterial interface cracks has been investigated using the experimental technique of transmission photoelasticity. For successful implementation of this experimental technique transparent glass fiber reinforced polyester composite materials were developed, enabling the direct observation and recording of photoelastic fringes in the orthotropic part of the bi-material. Opening mode stress intensity factors have been calculated using the stress field equations for interfacial cracks in the proposed bimaterials in conjunction with an orthotropic stressoptic law.

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