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The effect of large deformation and material nonlinearity on gel indentation 被引量:2
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作者 zheng duan yonghao an jiaping zhang hanqing jiang 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2012年第4期1058-1067,共10页
A gel, an aggregate of polymers with solvents, has dual attributes of solid and liquid as solvent migrates in and out of the polymer network. Indentation has recently been used to characterize the mechanical propertie... A gel, an aggregate of polymers with solvents, has dual attributes of solid and liquid as solvent migrates in and out of the polymer network. Indentation has recently been used to characterize the mechanical properties of gels. This paper evaluates the effects of large deformation and material nonlinearity on gel indentation through theoretical modeling and finite element analysis. It is found that large deformation significantly affects the interpretation of the experimen- tal observations and the classical relation between indenta- tion force and depth has limitations for large deformation. The material nonlinearity does not play a very important role on indentation experiment so that the poroelasticity is a good approximation. Based on these observations, this paper proposes an alternative approach to measure the mechanical properties of gels, namely, uniaxial compression experiment. 展开更多
关键词 Gel indentation Large deformation Finite element simulation
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