Reliability assessment of stress concentration performance state for a perforated composite plate under traction

Abstract

Abstract. Considering a perforated sandwich plate made from two elastic homogenous and isotropic layers, and having a square hole, reliability assessment of stress concentration limit state for which the stress should not exceed a given threshold is performed in this work. Assuming that the plate dimensions and the applied loading are deterministic, focus is done on the square hole centre position and edge length considered to be random variables. The means and the standard deviations of these variables are assumed to be known, but no information is so far available about their densities of probabilities. To assess reliability of the performance state, reliability analysis known methods are applied to a response surface representation of the stress concentration factor of the perforated plate which is obtained through quadratic polynomial regression of finite element results. A parametric study is performed regarding the influence of the distributions of probabilities chosen to model the hole dimensions uncertainties. It is shown that the probability of failure depends largely on the selected densities of probabilities.

Monte Carlo Simülasyon Yöntemi ile Dairesel Delikli Ankastre Kirişin Gerilim-Yoğunluk Katsayısına Bağlı Güvenilirlik Analizi

“…SCF, genellikle statik yüklemelerde sadece gevrek malzemelerde (kırılma uzaması  f <0.05); dinamik yüklemelerde ise hem sünek ( f ≥0.05) hem de gevrek malzemelerde dikkate alınmaktadır [1]. Fatura ve çentikler belirgin şekilde mekanik bileşenlerin yorulma ömrünü azaltmaktadır [2]. Bu yüzden SCF genellikle yorulma analizi çalışan araştırmacıların ilgi odağı haline gelmiştir.…”