Cálculo de tensiones en uniones soldadas de perfil asimétrico sometidas a flexión transversal
Jackson, Inga Maria
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AbstractShigley, one of the most prestigious authors of Design of Elements of Machines, who from the year 1964 until the date has published several textbooks [112-115], on having tackled the Topic of the Welded Unions, expresses: "One of the difficulties that it confronts the engineer in the design, on having worked with welded unions, is that one has not dedicated to this matter the same rigorous study as to other processes, materials and mechanical elements. It is not known why; but perhaps be because the geometric characteristics do not lend to an easy mathematical treatment. Certainly this means that there has interfered an additional element of suspense, which must be compensated by means of the use of safety factors of major magnitude in the design”. Of this Shigley exposition and since result of a deep analysis of the bibliography related to the calculation of the tensions in the welded unions can steady itself that the expressions of calculation of the tensions in the welded unions are capable to the improving. In Hernán's works [54-58] this type of Union is qualified like the Dogsbody of the Elements of Machines and he stands out as up to this moment, no author had tackled, for example, the calculation of the local tensions that appear in the apex of the gullet in the ends of the drawstring for the case of the unions to solape with seams of longitudinal filet, these points in which the proper authors admit that the tensions, given the phenomena of not uniform distribution of the tensions along the length of the drawstring and of the tension concentration in the thickness of the gullet, can become up to nine times or more average tensions; nevertheless there is used for 100 years a method based on the calculation of the average tensions on the section of the gullet, method is adapted for calculations of resistance of the drawstrings in conditions of static charges, but absolutely insufficiently to evaluate the resistance in conditions of cyclical charges.