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《Acta Armamentarii》 2008-04
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An Acoustic Emission-Based Uniaxial Tensile Test Method for Evaluation of Fracture Toughness of a Coating on Its Substrate

YANG Ban-quan1,2,ZHANG Kun1,CHEN Guang-nan1,LUO Geng-xing1,XIAO Jing-hua1(1.Institute of mechanics,Chinese Academy of Sciences,Beijing 100190,China;2.Department of Engineering Mechanics,Armored Force Engineering Institute,Beijing 100072,China)  
Fracture toughness and interfacial adhesive strength of coating on its substrate are the crucial parameters characterizing the performance and reliability of coating-substrate system.In this paper,a tensile experiment with acoustic emission signals inverse analysis and in situ observation of the cracking of the coating and interface was proposed to evaluate the fracture toughness and interfacial shear strength of the hard and brittle electroplated chromium coating on ductile steel substrate.The acoustic emission detector was attached to the specimen to check the signals of the cracking of chromium coating or interface and whether the crack density became saturated or not.The experimental results show that the strong signals belonged to the periodic cracking of the chromium coating.A mechanical model can be used to determine the fracture toughness.When the crack density of chromium coating became saturated,the steel substrate exhibited plastic deformation;however,the interface cracking could not be observed.This indicates the yield shear flow stress of the substrate can be exerted along the interface through the ductile substrate undergoing plastic deformation,and the yield shear flow stress level of the ductile steel substrate can only serve as a lower bound estimate of the ultimate shear strength of the interface.
【Fund】: 国家自然科学基金资助项目(50531060)
【CateGory Index】: TB52
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