Experimental and Numerical Investigations of Ultimate Strength of Imperfect Stiffened Plates of Different Slenderness

Abstract

The objective of this study is to analyse the behaviour of compressed stiffened plates of different slenderness using experimental and numerical methods. The presented results are part of a long-term project to investigate the ultimate strength of geometrically imperfect structures subjected to different degradation phenomena, including corrosion degradation and locked cracks. Several specimens were subjected to a uniaxial compressive force, and the most important quantities related to the structural behaviour were captured and analysed. A finite element model, accounting for material and geometrical nonlinearities and initial geometrical imperfections, was developed using the commercial software ANSYS. The residual welding-induced stresses were measured in the middle cross-section for two specimens. The initial imperfection was identified by employing a close-range photogrammetry approach. It was concluded that the numerical analyses, based on the finite element model, predict the ultimate strength of stiffened plates accurately, although some deviations were also observed. The detailed analysis with the indication of possible uncertainty is presented, and several conclusions are derived.

A comparison of geometric imperfection models for collapse analysis of ship-type stiffened plated grillages

“…The relations between the maximum distortion magnitude (𝑤𝑤 𝑜𝑜𝑜𝑜𝑜𝑜 𝑚𝑚𝑚𝑚𝑚𝑚 ) and the normalised ultimate compressive strength of stiffened plated grillage (𝜎𝜎 𝑚𝑚𝑢𝑢 𝜎𝜎 𝑌𝑌𝑌𝑌𝑌𝑌 ⁄ ) are shown from Figure (10) to Figure (13). Note that the presented results correspond to the asymmetric imperfection pattern, i.e.…”

Experimental and Numerical Investigation on Specimen Geometry Effect on the CTOD Value For VL-E36 Shipbuilding Steel

“…Tab. 4 Fig. 3 shows the stress -strain plot obtained from the test (nominal characteristic, blue line).…”

“…Another group of research is the study of phenomena, carried out on models. In this group of studies, we can find publications on the working mechanisms and failure of structures made of composites [3], behaviour of stiffened panels in ultimate load conditions [4] or the influence of corrosion factors on mechanical properties [5]. Moreover, the fracture toughness of structures is a frequent topic of research and this is the intent of this paper.…”

Ultimate Compressive Strength Assessment of Uncleaned and Cleaned Corroded Plates with Locked Crack

“…The ultimate strength of intact structures has been studied for many years, and some recent studies are presented in [3], [4]. The impact of corrosion on the load-carrying capacity of different ship structural elements was studied, both experimentally and numerically.…”