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In CFRP bonded onto steel plate, thermal stress is induced in steel plate by temperature change, due to difference in coefficients of thermal expansion between steel and CFRP. In this study, reduction technique of the thermal stress in steel plate, which is additional bonding of aluminum alloy plates, is proposed. Namely, the coefficient of thermal expansion of composite plate consisted of CFRP and aluminum plates is designed as that of steel. In this research, to verify the effectiveness of developed method, heat tests of CFRP and aluminum plates bonded onto steel plate were carried out. As a result of the tests, infinitesimal thermal stresses in steel plate with CFRP and aluminum plates were measured while large thermal stresses were measured in conventional CFRP bonded onto steel plate. Additionally, to confirm the test results, numerical analysis was also carried out.

Development of Reduction Technique of Thermal Stress Induced in Steel Plate Bonded by CFRP Plates