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...

Baja merupakan salah satu material yang banyak digunakan seiring kemajuan di bidang konstruksi. memiliki sifat-sifat mekanis dapat menjadi kelebihan dalam penggunaannya. Namun pada baja profil terdapat berbagai ukuran sehingga perlu penyesuaian dengan kebutuhan. Salah satunya modifikasi balok link sistem struktur tahan gempa EBF tambahan pengaku (stiffener). Tujuan penelitian ini yaitu menganal...

The rising prices of materials for ship construction is one the primary problems faced by global shipbuilding industries. A potential solution to reduce material cost through a structure optimization technique. In this study, plate and stiffener types, thickness, layout are optimized in order minimize materials. genetic algorithm (GA) popular technique determining design variables. However, GA ...

This paper considers the aeroelastic optimization of a subsonic transport wingbox under a variety of static and dynamic aeroelastic constraints. Three types of design variables are utilized: structural variables (skin thickness, stiffener details), the quasi-steady deflection scheduling of a series of control surfaces distributed along the trailing edge for maneuver load alleviation and trim at...

The conformational properties of Ac-∆(Me)Ala-NHMe (N-acetyl-N-methyl-α,β-dehydroalanine N’methylamide), as the simplest model of N-methyl-α,β-dehydroamino acids, was examined with theoretical methods and in comparison with Ac-∆Ala-NHMe and Ac-∆Ala-NMe2. The N-terminal amide of the ∆(Me)Ala residue easily adopts the configuration cis and the torsion angles φ, ψ are highly flexible. The ∆(Me)Ala ...

Abstract Additive manufacturing provides the possibility for innovative structural configurations promoting optimized material use economy and sustainability, new functions which are not available traditional products. This paper explores to wire‐and‐arc directed energy deposition process fabrication of WAAM stiffener thin plated structures. The proposed solution is demonstrated in several geom...

Study of the interaction of shear horizontal guided mode with defects in the bend region of an isotropic top hat stiffener is presented. Compared with the SH0 wave in a plate, the shear mode in the bend is dispersive and its wavefield characteristics are affected by the curvature of the bend. The scattering studies showed that the sensitivity of the wave to outer surface cracks in the bend incr...