Redirigiendo al acceso original de articulo en 18 segundos...
ARTÍCULO
TITULO

Laser Powder Bed Fusion of a Topology Optimized and Surface Textured Rudder Bulb with Lightweight and Drag-Reducing Design

Alessandro Scarpellini    
Valentina Finazzi    
Paolo Schito    
Arianna Bionda    
Andrea Ratti and Ali Gökhan Demir    

Resumen

This work demonstrates the advantages of using laser powder bed fusion for producing a rudder bulb of a moth class sailing racing boat via laser powder bed fusion (LPBF). The component was designed to reduce weight using an AlSi7Mg0.6 alloy and incorporated a biomimetic surface texture for drag reduction. For the topological optimization, the component was loaded structurally due to foil wing?s lift action as well as from the environment due to hydrodynamic resistance. The aim was to minimize core mass while preserving stiffness and the second to benefit from drag reduction capability in terms of passive surface behavior. The external surface texture is inspired by scales of the European sea bass. Both these features were embedded to the component and produced by LPBF in a single run, with the required resolution. Drag reduction was estimated in the order of 1% for free stream velocity of 2.5 m s-1. The production of the final part resulted in limited geometrical error with respect to scales 3D model, with the desired mechanical properties. A reduction in weight of approximately 58% with respect to original full solid model from 452 to 190 g was achieved thanks to core topology optimization. Sandblasting was adopted as finishing technique since it was able to improve surface quality while preserving fish scale geometries. The feasibility of producing the biomimetic surfaces and the weight reduction were validated with the produced full-sized component.

 Artículos similares

       
 
Michael Mayerhofer, Stefan Brenner, Ricardo Helm, Samira Gruber, Elena Lopez, Lukas Stepien, Gerald Gold and Günther Dollinger    
Compared to conventional manufacturing, additive manufacturing (AM) of radio frequency (RF) cavities has the potential to reduce manufacturing costs and complexity and to enable higher performance. This work evaluates whether normal conducting side-coupl... ver más
Revista: Instruments

 
Feng Li, Shisong Zheng and Fang Zhou    
In this study, AlFeCrMoNi1.8Nb1.5 (at.%) eutectic high-entropy alloy (EHEA) coating was successfully prepared on the surface of M2 high-speed steel (HSS) by wide-laser cladding. The effects of laser defocusing amount, laser power, scanning speed, and pre... ver más
Revista: Coatings

 
Rhys Jones, Daren Peng, Andrew Ang, Richard W. Aston, Nicole D. Schoenborn and Nam D. Phan    
This paper first presents the results of an experimental study into the damage tolerance of AA7075-T6, which is widely used in both fixed- and rotary-wing aircraft, space structures, and laser bed powder fusion (LBPF) Scalmalloy specimens built by Boeing... ver más
Revista: Aerospace

 
Redwan Ahmad, Mariia Zhuldybina, Xavier Ropagnol, Ngoc Duc Trinh, Chloé Bois, Juan Schneider and François Blanchard    
We designed and fabricated a terahertz (THz) frequency selective surface (FSS) based on two distinct additive manufacturing technologies, namely, printable electronics (PE) and three-dimensional (3D) printing. Silver nanoparticle ink was printed on a pol... ver más
Revista: Applied Sciences

 
Weiqiang Xiong, Yunjie Liu, Tianfu Zhang, Shixi Wu, Dawen Zeng, Xiang Guo and Aimin Pang    
Aluminium?lithium alloy (Al?Li alloy) powder has excellent ignition and combustion performance. The combustion product of Al?Li alloy powder combined with ammonium perchlorate is gaseous at the working temperature of solid rocket motors, which greatly re... ver más
Revista: Aerospace