Engineering Commons^™

Tensile Test Design To Measure Interlayer Adhesion In Investment Casting Shells For Spalling Mitigation, Shelby Boyd, Alex Miller, Jameson Senger

Materials Engineering

We designed a tensile test fixture for a 112 lbf capacity Instron load frame that imparts a normal force on the face of a button epoxied to an investment casting shell sample, delaminating the shell area attached to the button. Using a green standard shell (Group 1), a partially fired standard shell (Group 2), and a green shell with a different third coat (Group 3), we verified that the fixture can measure differences in strength between sample groups. We attached steel buttons to leveled samples with 0.05 mL of Hysol-Loctite 9340 epoxy, let it cure for 48 hours, and tested …