TESTING OF ELEMENTS AND JOINTS AT MECHANICAL CONSTRUCTIONS

Abstract

Testing of elements and joints at mechanical constructions under static load are presented in this paper. The mechanical properties of elements and joints at mechanical constructions are significant factors that influent to its answer to load. Those properties are determined in this paper by experimental testing on models with same geometries as related zones of commonly used elements and joints at mechanical constructions. Models are made of general purpose structural low carbon steel with different geometries in order to analyze the influence of stress concentration. Also, different joining methodologies, welded ones and ones that require holes at zones of joints, are considered in the paper by testing of related models. Evaluation of obtained results implicate that construction answer to load is highly related to stress concentration that is provoked by geometry, so as joining methodology. The results can be used to evaluate construction mathematical model in order to analyze its efficiency. Furthermore, it is implicated that, as mechanical properties of elements and joints highly influent to mechanical constructions answer to load, numeric simulations of those constructions, also must consider those mechanical properties as key factors. Design solutions of mechanical constructions are based on stress-strain state and mechanical properties of its elements and joints under projected exploitative condition. But, real stress-strain state at elements and joints in exploitation, so as its mechanical properties, resulted from very complex, timely dependent, set of factors besides of design solution, such as construction fitness for use, so testing of those elements and joints come in the focus.