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In all branches of engineering, from the earliest times to the present and into the future, there exist only two fundamental approaches to solve problems that arise in the discovery of knowledge and its application to society's needs: a. Theoretical modeling. b. Experimental measurement In engineering, this is true regardless of the discipline (mechanical engineering, electrical engineering , chemical engineering, etc.) or the engineering function (design, manufacturing, etc.). While some problems are adequately treated by using only theory, or only experimentation, most require judiciously chosen mix of these techniques. This is the situation that is presented in this paper, where besides to realize the theoretical analysis of the problem are used experimental measurements to obtain information that allow us to determine the cause of failure in the threaded fasteners of an assembled joint. [ABSTRACT FROM AUTHOR]