Characterisation of nonlinear material parameters of foams based on indentation tests

Li, B.; Gu, Yaodong; English, Russell; Rothwell, Glynn; Ren, Xuejun

doi:10.1016/j.matdes.2008.09.040

Cited by 18 publications

(10 citation statements)

References 14 publications

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“…An indentation test of the subject heel with an 8‐mm‐diameter indenter was carried out to obtain the compression data for the composite structure of skin and the fat pad. The skin layer parameters obtained were determined from parametric studies (12, 13) to fit the force–displacement curve as ‘calibrated’ against in vivo data on the same subject (Fig. 2).…”

Section: Methodsmentioning

confidence: 99%

Heel skin stiffness effect on the hind foot biomechanics during heel strike

Ren

et al. 2010

Skin Research and Technology

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The nonlinear parameter of the heel skin has been successfully predicted from in vivo indentation tests based on a subject-specific FE model. Skin properties' sensitivity tests clearly showed that the stiffness of the heel skin could have a direct effect on the biomechanics of the hind foot. The results suggest that individuals with a pathologically stiffened heel skin could exert an increase in the heel pressure, which may potentially lead to skin breakdown or ulcer.

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Section: Methodsmentioning

confidence: 99%

Heel skin stiffness effect on the hind foot biomechanics during heel strike

Ren

et al. 2010

Skin Research and Technology

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“…The process itself was also investigated to improve its performance. Li et al [11] investigated the mechanical behavior of foam under complex loading conditions in service over different spectrums of strain. The authors use a continuous indentation test and inverse finite element modeling to determine the nonlinear material parameters in a systematic way by means of local measurements with indentation tests.…”

Section: Introductionmentioning

confidence: 99%

Technological characterization of PE/EVA blends for foam injection molding

Spina

2015

Materials & Design

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“…An alternative, and more flexible, method of extracting time-dependent material parameters from nanoindentation data is to use an inverse finite-element analysis method (IFEM) that deploys a combination of forward model and experimental observation to determine the materials properties through the application of iterative optimization methods [ 23 , 24 ]. Principally, IFEM is similar to the analytical method proposed by Oyen [ 17 ] in which hereditary integral analysis was used for the computation of the VE equations and fitted with indentation test reference data.…”

Section: Introductionmentioning

confidence: 99%

An inverse method for determining the spatially resolved properties of viscoelastic–viscoplastic three-dimensional printed materials

Chen¹,

Ashcroft²,

Wildman³

et al. 2015

Proc. R. Soc. A.

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A method using experimental nanoindentation and inverse finite-element analysis (FEA) has been developed that enables the spatial variation of material constitutive properties to be accurately determined. The method was used to measure property variation in a three-dimensional printed (3DP) polymeric material. The accuracy of the method is dependent on the applicability of the constitutive model used in the inverse FEA, hence four potential material models: viscoelastic, viscoelastic–viscoplastic, nonlinear viscoelastic and nonlinear viscoelastic–viscoplastic were evaluated, with the latter enabling the best fit to experimental data. Significant changes in material properties were seen in the depth direction of the 3DP sample, which could be linked to the degree of cross-linking within the material, a feature inherent in a UV-cured layer-by-layer construction method. It is proposed that the method is a powerful tool in the analysis of manufacturing processes with potential spatial property variation that will also enable the accurate prediction of final manufactured part performance.

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Characterisation of nonlinear material parameters of foams based on indentation tests

Cited by 18 publications

References 14 publications

Heel skin stiffness effect on the hind foot biomechanics during heel strike

Heel skin stiffness effect on the hind foot biomechanics during heel strike

Technological characterization of PE/EVA blends for foam injection molding

An inverse method for determining the spatially resolved properties of viscoelastic–viscoplastic three-dimensional printed materials

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