Seite - 94 - in 3D Printing of Metals

Metals 2016,6, 280 Figure9.Anexampleofpartsdisassembly. 3.2.1. FlangeFramewithTorque Theflange often bears the torsionalmoment from its bolt holes. According to the following conditions, theoptimaldesignof the frameworkof thestructurewascarriedout. (1) Objective function:minimumstructuremass (2) Condition: flangebears torsion load (3) Boundaryconditions: theboltholesarefixedandthe inner surfaceof theflange isapplied to the torque (4) Designspace: brownregion ingraph (5) Minimumthickness: 0.006m (6) Designconstraints:meetingthestrengthrequirementswithminimummass Accordingto the topologyoptimizationconditionsabove, theoriginalpartmodelwasdefinedas showninFigure10a. The frameworkobtainedbytopologyoptimizationcanbeseen inFigure10b. Thisnewstructurewas taken intoANSYSWorkbenchtoanalyze its strength. Thestressdistribution onthestructurebecameuniformafteroptimization,asshowninFigure10c. Figure10. Theoriginalflangemodel (a), flange frameworkobtainedby topologyoptimization (b), stressdistributionofflangeframe(c). The comparison of the stress distribution density before and after optimization is shown in Figure11.AscanbeseenfromFigure11, the twostructureshavethesamemaximumstressandthe average stressof theoptimizedstructurebecame larger. Thus, theutilization ratioof the structure was improved. 94