Optimized manufacturable porous materials
 Authors

 Erik Andreassen
 Casper Schousboe Andreasen
 Jakob Søndergaard Jensen
 Ole Sigmund
 Publication Date
 Keywords

 Topology Optimization Has Been Used To Design TwoDimensional Material Structures With Specific Elas
 But Optimized Designs Of ThreeDimensional 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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