DIMENSIONING OF AN AUTOMOTIVE STRUCTURAL COMPONENT BY SORM DG METHOD
Emmanoel Guasti Ferreira1; Marcílio Sousa da Rocha Freitas1; José Antonio da Rocha Pinto2; Geraldo Rossoni Sisquini3
1 PROPEC - Universidade Federal de Ouro Preto (UFOP); 2 DMAT - Universidade Federal do Espírito Santo (UFES); 3 DEM - Universidade Federal do Espírito Santo (UFES)
doi:10.20906/CPS/CILAMCE2017-1121
Resumo
It is presented the reliability analysis of an automotive structural component (two-supported metal beam), which often occurs in vehicular applications, such as stringers and transverse reinforcements, whose failure will present risk to users of the motor vehicle. The fact that in a real situation the variables involved in this analysis be random in nature, it was considered a target reliability index equal to 4,200 (pf ), which, in accordance with the Joint Committee on Structural Safety (JCSS) - 2001, represents a moderate failure consequence, as well as relative cost of normal security measure. A comparison of cross-sectional dimensions (b x h) it was established, where b is the thickness and h = 2b is the height of this component, whose results provided by the method that considers the variables involved as deterministic were b = 66.94 mm and h = 133.88 mm, and the results of the methods that consider these variables as random, that is, the FORM (First Order Reliability Method) and SORM DG (Second Order Reliability Method by Differential Geometry) semi-analytical methods, whose calculated values were b = 64.01 mm and h = 128.02 mm, which were coincident with the values established by the Simple Monte Carlo Simulation, used only as a measurement tool.
Palavras-chave: SORM DG; limit state surface; reliability index; main curvatures; differential geometry