LIGHTWEIGHT STIFFENING RIBS IN STRUCTURAL PLATES

Paper #:
  • 2017-01-0268

Published:
  • 2017-03-28
Abstract:
Friction Stir Processing (FSP) has been used to refine grain structure in sheet metals, and is based on friction stir welding (FSW) principles developed and patented by TWI Ltd, Cambridge, UK in 1991. In Friction Stir Processing (FSP) a tool generates heat from friction and pressure causing a material to become plastic without melting. The tool then mixes the base material in a circular motion as it traverses laterally through the material . It is possible to add 2D or 3D Nano particles to locally alter the material’s stiffness (young’s modulus). For example in, friction stirred TiB2 particles in cast iron resulted in over 2x hardness and wear resistance (by ASTM G35). Since FSP is not a forming process, the pattern of the ribs can be any 2D pattern (linear, circular, spiral, etc.). The main focus of the Nano-reinforced FSP is to achieve increased localized stiffness with minimal increase in density of the local material to achieve light weighting. The addition of Nano-particles in addition to grain refinement of the localized microstructure results in improved mechanical properties such as higher yield strength and elastic modulus. The objective of this analysis was to create stiffening “ribs” in structural components by locally stiffening the material. These stiffening ribs could dampen, redirect, or otherwise alter the transmission of energy waves created from automotive, ballistic, or blast shocks to improve noise, vibration, and harshness (NVH) and structural integrity (reduced joint stress) response. Since the ribs are not created from geometry changes or any addition of the base material, they are light weight. Modelling and simulation analysis was used to evaluate different Friction Stir Processed (FSP) rib patterns in AL 5182 and AL 7075 base metal to assess performances for blast and ballistics loads. Equivalent weighted RHA plate was also modeled and analyzed for comparative purpose
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