PARAMETRIC UNCERTAINTY ANALYSIS CONSIDERING METROLOGICAL ASPECTS IN THE STRUCTURAL SIMULATION IN VISCOELASTIC MATERIALS

Abstract

THIS PAPER PROPOSES TO DISCUSS THE NECESSITY OF INCLUDING METROLOGICAL ASPECTS IN THE PARAMETRIC UNCERTAINTY ANALYSIS IN THE STRUCTURAL SIMULATION PROCESS IN VISCOELASTIC MATERIALS. THE RESEARCH FOCUS IS THE IDENTIFICATION, QUANTIFICATION AND PROPAGATION OF THE MEASUREMENT UNCERTAINTY (INVOLVED IN THE PROBLEM MODELING), THROUGH THE COMPUTATIONAL MODEL OF STRUCTURAL SIMULATION. THERE ARE MANY EXPERIMENTAL PROCEDURES SUPPORTING THE CHARACTERIZATION OF THE INPUT PARAMETERS IN A STRUCTURAL MODEL SUCH AS THE DEFINITION OF THE STRUCTURAL GEOMETRY, LEVELS OF APPLIED LOADS, MATERIAL PROPERTIES AND AMBIENT CONDITIONS. CONSEQUENTLY, THE USAGE OF METROLOGICAL ASPECTS BECOMES NECESSARY IN ORDER TO GUARANTEE THE EQUIVALENCE OF RESULTS AMONG DIFFERENT LABORATORIES AND ALSO THE EVALUATION OF THE MEASUREMENT OR SIMULATION RESULT WITH ITS SPECIFICATIONS. THE PROPOSED METHODOLOGY FOR ANALYZING THE UNCERTAINTIES PRESENT IN THE SIMULATION OF STRUCTURAL PROBLEMS IN VISCOELASTIC MATERIALS IS COMPOSED BY TWO MODULES. THE FIRST MODULE CONSISTS ON IDENTIFYING AND QUANTIFYING THE SOURCES OF UNCERTAINTY PRESENT IN THE PROCESS OF CHARACTERIZING A VISCOELASTIC MATERIAL THROUGH THE CREEP TEST. IN THE SECOND MODULE THE INFLUENCE OF MATERIAL PROPERTIES AND OTHER UNCERTAINTIES IN THE SIMULATED BEHAVIOR OF THE STRUCTURAL COMPONENT IS INVESTIGATED. THE MONTE CARLO SIMULATION METHOD IS USED FOR THIS PURPOSE. THE MONTE CARLO METHOD OF SIMULATION HAS CERTAIN LIMITATIONS IN ITS APPLICATION TO VISCOELASTIC PROBLEMS, DUE TO THE NEED OF REPEATED SIMULATIONS, THE TIME OF COMPUTATIONAL ANALYSIS RAISES. THIS PAPER PRESENTS ALTERNATIVES FOR USING SMC IN VISCOELASTIC PROBLEMS THROUGH MODELS SUPPLIED BY THE CORRESPONDENCE PRINCIPLE AND THE RESPONSE SURFACE METHOD.