Postbuckling of Marine Stiffened Composite Plates with Initial Geometric Imperfections Using Progressive Failure Analysis

Abstract

This work explores the postbuckling behavior of a marine stiffened composite plate in the presence of initial imperfections. The imperfection shapes are derived from buckling mode shapes and their combinations. Thereafter, these imperfection shapes are applied to the model, and nonlinear large deflection finite element and progressive failure analyses are performed in ANSYS 18.2 software. The Hashin failure criterion is employed to model the progressive failure in the stiffened composite plate. The effect of the initial geometric imperfection on the stiffened composite plate is investigated by considering various imperfection patterns and magnitudes. Results show that when the magnitude of the imperfection is 20 mm, the ultimate strength of the stiffened composite plate decreases by 31%. Moreover, global imperfection shapes are found to be fundamental in determining the ultimate strength of stiffened composite plates and their postbuckling. Article Highlights• The effect of initial geometric imperfection mode shapes and magnitude on the ultimate strength of the stiffened composite panels are studied.• The 11 th first buckling mode shapes and a series of combinations of them are assumed as initial geometric imperfections.• The postbuckling and damage are modeled using the progressive damage method and nonlinear finite element method.

Kompozit Bir Teknenin Dip Levhasının Sonlu Elemanlar Yöntemi ile Analizi ve Yapısal Optimizasyonu

“…Levha boyuna yönde uzanan iki adet şapka tipi destek elemanı ile desteklenmektedir. Levha perspektif görüntüsü (a) ve ölçüleri (b, mm) Levhanın uzunluğu, destek elemanlarının genişliği ve destekler arası mesafe hali hazırda literatürde kullanılan üzerine birden fazla makale yazılan(Chen & Soares, 2007;Chen & Soares, 2008;Morshedsolouk & Karimirad, 2021) bir levhaya uygun olarak seçilmiştir. Levhanın kalınlığı ise kendi gemi boyutlarımıza uygun olacak şekilde revize edilmiştir.…”