In present paper a new
rotating-structure was introduced to detect local
residual stress and in-plane deflection in thin
cold-rolled sheet of copper alloy.The rotating-structures were analyzed and optimized by finite element method(FEM) in order to achieve high measurement sensitivity and proper structure fabricated by wire electric discharge machining(EDM).An experimental validation of the
rotating-structure was carried out with a special device which simulated the
residual stress Strains and the corresponding deformations of the structure were measured by strain gages and tool-micrometer,respectively.The sensitivity of the structure from the test was 0.49(μm/10~-6)with 4% deflection which was very close to the FEM result.The measurement results using rotating-structure on C194 sheet(600mm×0.23mm) were compared with results from chemically etched method suggested by JBMA.The results form the two methods are well consistent with each other.It is concluded that the rotating-structure has relatively high accuracy in both stress and deflection detecting,and it can be easy performed in specimen-fabricating and measuring.