Aluminum extruded panels are increasingly used in marine structures as lightweight solutions. Less welding is needed for such extrusions than traditional built-up of stiffener to plate sheets. However, the buckling mode and ultimate strength aluminum difficult predict with existing formulas due different sensitivity. This paper presents a numerical study on panels, effects taken into account. T...

In order to study the hysteretic behavior and restoring force model of cold-formed thin-walled steel (CFTWS) lipped channel beam-column, a finite element analysis (FEA) considering material geometric nonlinearity influence initial imperfection under cyclic loading was established by ABAQUS software. Based on verified FEA model, CFTWS beam-column members with different influencing factors analyz...

The ecophysiology of the Norway spruce (Picea abies (L.) Karst.) trees that were used by three-toed woodpeckers (TTW) (Picoides tridactylus) for their sap-feeding activities investigated. pilot study was conducted in southern Finland (61°15′ N, 25°00′ E). During April–June 2015, three different tree categories selected monitoring: frequently TTWs phloem several previous years; only recently sap...

The stability and design of steel equal-leg angle section members subjected to uniaxial bending are studied herein. An experimental investigation, comprising material testing, initial geometric imperfection measurements physical tests on hot-rolled beams is first presented. test results, in combination with existing data collected from the literature, then used for validation numerical (shell f...

To solve the problems of low precision weak feature extraction, heavy reliance on labor and efficiency extraction in X-ray weld detection image ultra-high voltage (UHV) equipment key parts, an automatic algorithm is proposed. Firstly, original denoised while retaining characteristic information defects by proposed monostable stochastic resonance method. Then, binarization achieved combining Lap...

Buckling of slender structures under compressive loading is a failure of infinitesimal stability due to a confluence of two factors: the energy density non-convexity and the smallness of Korn’s constant. The problem has been well understood only for bodies with simple geometries when the slenderness parameter is well defined. In this paper we present the first rigorous analysis of buckling for ...