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Vol.15, No.1, 2015, pp.15–18 |
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SHEAR STRENGTH TESTING OF HARDFACED SAMPLES USING SPECIAL TOOL ON AN UNIVERSAL TESTING MACHINE Vukić Lazić1, Aleksandar Sedmak2, Ivan Samardžić3, Srbislav Aleksandrović1, Dušan Arsić1, Dragan Milosavljević1, Milan Đorđević1 1)University of Kragujevac, Faculty of Engineering, vlazic@kg.ac.rs 2)University of Belgrade, Faculty of Mechanical Engng. 3)University of Osijek, Faculty of Mechanical Engineering |
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Abstract Complex working conditions of forging dies are the most frequent causes of their damage, requiring suitable hard facing repair procedures. The method of determining the bond strength between the hardfaced layer and the base material is explained in details, and the relation between hardfaced layer output results and the applied technology is established. Shear testing of materials has proven to be one of the most difficult areas of mechanical property testing. Shear modulus measurements are mainly accurate, but it is very difficult to measure shear strength. Edges, material coupling, non-pure shear loading, non-linear behaviour, imperfect stress distribution and coupling with normal stresses make shear strength determination difficult. None of the available test methods are without inaccuracies. Therefore, in structural applications, shear strength data should be used very carefully, on a case-by-case basis, appreciating the consequences of potential inaccuracies of the used values. Keywords: forging dies, hard facing, thermal fatigue, shear stress, hardness, microstructure |
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full article (402 kB)
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