Improving the validation of finite element models with quantitative full-field strain comparisons

Gröning, Flora; Bright, Jen A.; Fagan, Michael J.; O’Higgins, Paul

doi:10.1016/j.jbiomech.2012.02.009

Cited by 27 publications

(17 citation statements)

References 24 publications

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“…The inclusion of the PDL in FE models as a layer of compliant material between the teeth and alveoli effectively creates large holes in the mandibular corpus (Gr€ oning et al, 2011a;Gr€ oning and Fagan, in press) and beam mechanics predicts that a mandible with such an open cross section is less resistant to bending and torsion than a mandible with a closed cross section (Young and Budynas, 2002). In vitro loading experiments with human mandibles have shown that the mandible indeed behaves as an open section under bending, but as a closed section under torsion (Daegling et al, 2008).…”

Section: Periodontal Ligamentmentioning

confidence: 99%

Modeling the Human Mandible Under Masticatory Loads: Which Input Variables are Important?

Gröning

Fagan

O’Higgins

2012

The Anatomical Record

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Finite element analyses (FEA) that have simulated masticatory loadings of the human mandible differ significantly with regard to their basic input variables such as material properties, constraints, and applied forces. With sensitivity analyses it is possible to assess how the choice of different input values and the degree of model simplification affect FEA results. However, published FEA studies are rarely accompanied by sensitivity analyses so that the robusticity of their results is impossible to assess. Here, we conduct a sensitivity analysis with an FE model of a human mandible to quantify the relative importance of several modeling decisions: (1) the material properties assigned to the cancellous bone tissue; (2) the inclusion or not of the periodontal ligament; (3) the constraints at the joints and bite point; and (4) the orientation of applied muscle forces. We study the effects of varying these properties by analysing the strain magnitudes and directions across the model surface. In addition, we perform a geometric morphometric analysis of the deformation resulting from the loading of each model. The results show that the effects of altering the different model properties can be significant and that most effects are potentially large enough to cause problems for the biological interpretation of FEA results. We therefore recommend that researchers conduct more sensitivity analyses than at present to assess the robusticity of their FEA results and their biological conclusions. Anat Rec,

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Section: Periodontal Ligamentmentioning

confidence: 99%

Modeling the Human Mandible Under Masticatory Loads: Which Input Variables are Important?

Gröning

Fagan

O’Higgins

2012

The Anatomical Record

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“…As CT attenuations only provide a scalar value at each point, many studies assume isotropic elasticity (164)(165)(166)(167)(168)(169), although anisotropic material properties have also been implemented using information within the voxel (170). The elastic moduli for early isotropic models have been homogeneous (171)(172)(173), but more recent studies have used inhomogeneous materials (8,164,165,170,174-178) as they have been found to be more accurate than the models using homogeneous material properties (9,179,180).…”

Section: The Finite Element Methodsmentioning

confidence: 99%

Experimental validation of finite element predicted bone strain in the human metatarsal

Fung

Loundagin

Edwards

2017

Journal of Biomechanics

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The objective of this study was to verify and validate a finite element modeling routine for the human metatarsal, which is a common location for stress fractures. Experimental strain measurements on 33 human cadaveric metatarsals subject to cantilever bending were compared with strain predictions from finite element (FE) models generated from computed tomography images. For the material property assignment of the FE models, a published density-elasticity relationship was compared with density-elasticity equations developed using optimization techniques. The correlations between the measured and predicted and predicted strains were very high (r 2 ≥0.94) for all of the density-elasticity equations. However, the utilization of an optimized density-elasticity equation improved the accuracy of the finite element models, reducing the maximum error between measured and predicted strains by 10% to 20%. The finite element modeling routine could be used for investigating potential interventions to minimize metatarsal strains and the occurrence of metatarsal stress fractures.iii

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“…Autores como (Kacmarcik et al, 2010), así como (Gröning et al, 2012) realizaron la validación de sus análisis numéricos mediante la utilización de galgas extensométricas triaxiales.…”

Section: Fig 4 Conexión De Galgas En Configuración Roseta Deltaunclassified

Análisis Comparativo Estructural Mediante Galgas Uniaxiales y Triaxiales para un Perfil de Ala NACA 4412

Ramírez¹,

Castañeda²,

Nuño³

2014

Inf. tecnol.

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* Autor a quien debe ser dirigida la correspondenciaRecibido Dic. 13, 2013; Aceptado Feb. 20, 2014; Versión final recibida Abr. 17, 2014 Resumen Se realizó un estudio sobre un ala con perfil NACA 4412 construido en aluminio 6061, para obtener mediciones de esfuerzos del perfil aerodinámico, que se procesaron por medio de un sistema de adquisición de datos PXI. Se realizó un análisis comparativo entre lo teórico, el análisis por el método de elementos finitos usando el programa ANSYS y medido con el sistema de adquisición de datos PXI, para validar la metodología utilizada en la medición. Mediante galgas uniaxiales se logró la configuración de galgas triaxiales, integrando este arreglo al sistema de adquisición de datos, para monitorear la información medida. Según los resultados teóricos, los de ANSYS y los experimentales, se observa un aceptable grado de exactitud entre los valores. Estos resultados validan la adquisición de datos por medio de una configuración de galgas en forma de roseta en delta para el análisis de esfuerzos del perfil aerodinámico. Palabras claves: método del elemento finito, galgas extensométricas, esfuerzos, perfil aerodinámico, deformación unitaria. Comparative Structural Analysis by Uniaxial and Triaxial Strain Gauges on a Wing Profile NACA 4412 AbstractA study was performed on the structural behavior of a wing profile NACA 4412 fabricated with aluminum 6061, to obtain stress measurements of an airfoil, which are processed by a data acquisition system PXI. A comparative analysis between theoretical estimates, analysis by the finite elements method using the software ANSYS and values measured with the data acquisition system PXI, for validating the methodology used in the measurement. Through a set of uniaxial gauges, a triaxial configuration was achieved, integrating this arrangement to the data acquisition system in order to monitor the information measured. According to the theoretical results, those of the ANSYS analysis and the experimental values, an acceptable degree of accuracy was achieved. These results validate the data acquisition through a setting gauge in the form of delta rosette for the stress analysis of an airfoil.

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Improving the validation of finite element models with quantitative full-field strain comparisons

Cited by 27 publications

References 24 publications

Modeling the Human Mandible Under Masticatory Loads: Which Input Variables are Important?

Modeling the Human Mandible Under Masticatory Loads: Which Input Variables are Important?

Experimental validation of finite element predicted bone strain in the human metatarsal

Análisis Comparativo Estructural Mediante Galgas Uniaxiales y Triaxiales para un Perfil de Ala NACA 4412

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