Adaptive energy-absorbing materials using field-responsive fluid-impregnated cellular solids

被引:53
作者
Deshmukh, Suraj S.
McKinley, Gareth H.
机构
[1] MIT, Hatsopoulos Microfluids Lab, Dept Mech Engn, Cambridge, MA 02139 USA
[2] MIT, Inst Soldier Nanotechnol, Cambridge, MA 02139 USA
关键词
D O I
10.1088/0964-1726/16/1/013
中图分类号
TH7 [仪器、仪表];
学科分类号
0804 ; 080401 ; 081102 ;
摘要
Adaptive materials with rapidly controllable and switchable energy-absorption and stiffness properties have a number of potential applications. We have developed, characterized and modeled a class of adaptive energy-absorbing systems consisting of nonlinear poroelastic composites wherein a field-responsive fluid, such as a magnetorheological fluid or a shear-thickening fluid, has been used to modulate the mechanical properties of a cellular solid. The mechanical properties and energy-absorbing capabilities of the composite are studied for variations in design parameters including imposed field strength, volume fraction of the field-responsive fluid within the composite and impact strain rates. The total energy absorbed by these materials can be modulated by a factor of 1- to 50-fold for small volume fractions of the fluid (similar to 15%) using moderate magnetic fields varying from 0 to 0.2 T. A scaling model is also proposed for the fluid-solid composite mechanical behavior that collapses experimental data onto a single master curve. The model allows optimization of the composite properties in tune with the application requirements. Potential application areas are discussed with emphasis on applicability in impact-absorbing headrests and cushioned assemblies for energy management.
引用
收藏
页码:106 / 113
页数:8
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