CYCLIC AND MONOTONIC BEHAVIOR OF EPOXY SHAPE MEMORY POLYMER FOAM
Shape memory polymer (SMP) foams have low density,high compressibility,and shape memory properties that give them a wide range of potential applications.However,their thermo-mechanical and structural behavior is not well understood.We investigated epoxy SMP foam with a relative density near 20％ with anobserved glass transition temperature of 90℃.The foam was deformed under bothtension and compression at temperatures ranging from 25℃to 125℃.Tensilestrain to failure as a function of temperatures was used to determine that theoptimum deformation temperature is 80℃.Large strain cyclic testing confirmedthat deformation at 80℃ maximized macroscopic strain recovery.Compressiontests were performed to examine the compressibility of the material as a function oftemperature and shape recovery tests showed a recovery dependence on packagingtemperature.Micro-computed tomography scans of the foam at various compressedstates were used to understand foam deformation mechanisms.The microCT studiesrevealed the bending,buckling,and collapse of cells with increasing compression,consistent with results from published numerical simulations.MicroCT scans havealso been coupled with cyclic testing to determine the structural effect of impartedpermanent macroscopic strain.
Ken Gall David L.McDowell Matthew A.Di Prima Martha Lesniewski Terry Sanderson Douglas Campbell
School of Materials Science and Engineering,Georgia Institute of Technology Woodruff School of Mecha School of Materials Science and Engineering,Georgia institute of Technology Raytheon Missile Systems Composite Technology Development
国际会议
第二届国际非均质材料力学会议(The Second International Conference on Heterogeneous Material Mechanics)
安徽黄山
英文
819
2008-06-03（万方平台首次上网日期，不代表论文的发表时间）