Life Time Prediction Based on the Combined Use of Finite Element and Modal Analysis Data,
KATHOLIEKE UNIV LEUVEN (BELGIUM) DEPT WERKTUIGKUNDE
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The knowledge of the stress or strain history at the critical point is essential for the estimation of life time of dynamically loaded structures. Besides the definition of the correct loading pattern, an identification of the mechanical structure is necessary. This identification may be carried out analytically or experimentally. If this structure is available for testing the experimental identification is quite attractive because fewer hypothesis have to be accepted especially with respect to the damping characteristics. This procedure enables one to evaluate the influence on life time of various modifications in structural design, material properties Young modulus, density and fatigue properties, frequency content and distribution of the dynamical load and damping properties of the structure. The technique developed here can readily be applied and can be used to optimise life time of various types of mechanical structures.