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Optimized manufacturable porous materials

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  • Topology Optimization Has Been Used To Design Two-Dimensional Material Structures With Specific Elas
  • But Optimized Designs Of Three-Dimensional Material Structures Are More Scarsely Seen
  • Partly Because It Requires More Computational Power
  • And Partly Because It Is A Major Challenge To Include Manufacturing Constraints In The Optimization
  • <Br/>This Work Focuses On Incorporating The Manufacturability Into The Optimization Procedure
  • Allowing The Resulting Material Structure To Be Manufactured Directly Using Rapid Manufacturing Tech
  • Such As Selective Laser Melting/Sintering (Slm/S)
  • The Available Manufacturing Methods Are Best Suited For Porous Materials (One Constituent And<Br/>Vo
  • But The Optimization Procedure Can Easily Include More Constituents
  • <Br/>The Elasticity Tensor Is Found From One Unit Cell Using The Homogenization Method Together With
  • The Distribution Of The Material In The Unit Cell Is Optimized According To A Given Objective(E
  • G
  • Maximum Bulk Modulus Or Minimum Poisson’S Ratio) And Some Given Constraints (E
  • G
  • Isotropy) Using Topology Optimization
  • The Manufacturability Is Achieved Using Various Filtering Techniques Together With A Stochastic Appr
  • Where The Mean Performance Of Several Slightly Different Designs Is Optimized
  • In Most Cases This Assures A Minimum Length<Br/>Scale For The Intermediate Design
  • And Thereby Manufacturability Is Achieved
  • <Br/>Furthermore
  • The Study Will Look At How "Negative" Aspects Of The Manufacturing Method Can Be Exploited To Achiev
  • An Example Of This Is How The Slm/S Causes Softer Regions In The Structure Due To Insufficient Heati
  • If The Goal Is To Design A Material
  • Which To Some Degree Is Compliant
  • Such As Negative Poisson’S Ratio Material
  • Softer Regions Are Desirable
  • Another Example Is Closedcell Materials
  • E
  • G
  • Maximum Bulk Modulus Material
  • Where The Cells Will Be Filled By Metal Powder If Manufactured Using Slm/S
  • This Is Considered As A Drawback
  • Because<Br/>It Makes The Structure Heavier
  • However
  • It Also Drastically Increases The Damping Ratio Of The Structure
  • Which Is Beneficial In Many Applications

Abstract

Optimized manufacturable porous materials - DTU Orbit (26/04/14) Optimized manufacturable porous materials - DTU Orbit (26/04/14) Andreassen, Erik et al. Optimized manufacturable porous materials. 2012.

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