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Cold roll bonding process is one methods for production of multi-layered sheets with same and dissimilar materials that, in the past decade has been attention of many researchers. In this research, for the first time and according to ASTM-E561 and using compact tension specimens investigated plane stress fracture toughness for thin for two layers of aluminum sheets produced by Cold Roll Bonding Process. The fracture toughness is an important parameter in the design that their analysis can predict crack growth and life for material has crack. In addition to the fracture toughness, mechanical properties and tensile fracture surfaces were evaluated by using of uni-axial tensile test, micro hardness and scanning electron microscopy, respectively. Results of these test demonstrated that value of tensile strength, micro hardness and plane stress fracture toughness for two layers of aluminum sheets produced by Cold Roll Bonding process is far more than annealed sample that compared to the initial sheet respectively 150%, 80% and 51% improved. But value of elongation decreased. Also results of SEM demonstrated that dimples shallower and smaller than the initial sample that this factor confirmed increasing strength and reducing ductility. Of course the main role of this variation, applying high strain and cold working plays.

Keywords: Fracture toughness, CARB, 1050 aluminum sheet, Mechanical Properties, SEM

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