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Keywords: indentation
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Journal Articles
Article Type: Research-Article
J Biomech Eng. February 2021, 143(2): 021003.
Paper No: BIO-20-1154
Published Online: October 8, 2020
... of the previous studies used an indenter in three point bending experiments while the effect of its rigidity was never considered. In this work, using the porcine long bones, the three point bending tests were conducted to explore the bone fracture behaviors under a rigid indenter. In addition to collecting...
Journal Articles
Article Type: Technical Briefs
J Biomech Eng. November 2013, 135(11): 114507.
Paper No: BIO-13-1082
Published Online: October 1, 2013
... to the indentation data from each region are reported, which describe the shear relaxation behavior for each anatomic region within each age group at both short (<10 ms) and long (∼20 s) time scales. These data will be useful for improving the biofidelity of finite element models of rat brain deformation at short...
Journal Articles
Article Type: Research Papers
J Biomech Eng. August 2012, 134(8): 081007.
Published Online: August 6, 2012
... system. Tissue thicknesses were measured using a needle punch test. Specimens underwent pretreatment load-relaxation testing using a spherical indenter. Bipolar RFE treatment was applied for 45 s and the indentation protocol was repeated. Structural properties were derived from the force-time data...
Journal Articles
Article Type: Research Papers
J Biomech Eng. November 2011, 133(11): 111001.
Published Online: November 17, 2011
.... The accuracy of the implementation is verified using 2D axisymmetric problems, including indentation with a flat-ended indenter, indentation with spherical-ended indenter, and contact of glenohumeral cartilage layers. The biphasic finite element contact formulation and its implementation are shown to be robust...
Journal Articles
Article Type: Research Papers
J Biomech Eng. August 2011, 133(8): 081004.
Published Online: September 6, 2011
... strains (20%). The constitutive material parameters were determined using a coupled finite element-optimization algorithm that utilized stress relaxation indentation tests at relatively high strains. The proposed model incorporates the strain-hardening, tension-compression, permeability, and finite...
Journal Articles
Article Type: Research Papers
J Biomech Eng. July 2011, 133(7): 071009.
Published Online: July 29, 2011
... to describe the shear relaxation modulus for each anatomic region tested. Prony series parameters fit to load data from indentations performed to ∼10% strain differed significantly by anatomic region. The gray and white matter of the cerebellum along with corpus callosum and brainstem were the softest regions...
Journal Articles
Article Type: Research Papers
J Biomech Eng. April 2011, 133(4): 041006.
Published Online: March 15, 2011
... of deformation. We demonstrate the use of this methodology by determining the minimal rheological arrangement, constitutive relationships, and model parameters for the structural response of various soft tissues, including ex vivo perfused porcine liver in indentation, ex vivo porcine brain cortical tissue...
Journal Articles
Article Type: Research Papers
J Biomech Eng. August 2010, 132(8): 081009.
Published Online: June 28, 2010
...Saeid Kasiri; Ger Reilly; David Taylor The fracture of bone due to indentation with a hard, sharp object is of significance in surgical procedures and certain trauma situations. In the study described below, the fracture of bovine bone under indentation was measured experimentally and predicted...
Journal Articles
Article Type: Technical Briefs
J Biomech Eng. August 2010, 132(8): 084501.
Published Online: June 28, 2010
...Amit Gefen A continuum model based on the contact mechanics theory was developed and used for evaluating virus indentation forces at the early stage of membrane invagination, as well as the work of the virus indentation forces and virus-cell contact pressures in a receptor-mediated endocytosis...
Journal Articles
Article Type: Research Papers
J Biomech Eng. August 2010, 132(8): 081008.
Published Online: June 18, 2010
... parameters are determined on the basis of literature experimental data. Indentation experiments along the axial (the longitudinal direction of long bones) and transverse directions have been simulated with the purpose to calculate the indentation moduli and the tissue hardness in both the indentation...
Journal Articles
Article Type: Research Papers
J Biomech Eng. July 2010, 132(7): 071010.
Published Online: May 26, 2010
...Rouzbeh Amini; Victor H. Barocas Corneoscleral indentation changes the iris contour and alters the angle between the iris and cornea. Although this effect has long been observed, the mechanism by which it occurs remains poorly understood. Previous theoretical research has shown that corneoscleral...
Journal Articles
Article Type: Research Papers
J Biomech Eng. April 2010, 132(4): 041007.
Published Online: March 18, 2010
.... The goal of this study was to perform a matching point-to-point validation of indirect cartilage thickness calculations using a magnetic resonance (MR) image data set with direct cartilage thickness measurements using biomechanical indentation testing at the same anatomical locations. Seven bovine distal...
Journal Articles
Article Type: Research Papers
J Biomech Eng. January 2010, 132(1): 011010.
Published Online: December 18, 2009
... and hippocampus in P10, P17, and adult rats. Apparent elastic modulus increased nonlinearly with indentation strain, and a nonlinear Ogden hyperelastic model was used to fit the force-deflection data. Subregional heterogeneous distributions of mechanical properties changed significantly with age. Apparent elastic...
Journal Articles
Article Type: Research Papers
J Biomech Eng. January 2010, 132(1): 011005.
Published Online: December 9, 2009
... from a radial cut on transverse brain slices were about 40–110 deg (depending on region and stage) and served as an indicator of circumferential residual stress. In addition, using a custom-made microindentation device and finite-element models, we determined regional indentation stiffness and material...
Journal Articles
Article Type: Technical Briefs
J Biomech Eng. September 2009, 131(9): 094507.
Published Online: August 28, 2009
...S. Tripathy; E. J. Berger Relaxation indentation experiments using atomic force microscopy (AFM) are used to obtain viscoelastic material properties of soft samples. The quasilinear viscoelastic (QLV) model formulated by Fung ( 1972, “Stress Strain History Relations of Soft Tissues in Simple...
Journal Articles
Article Type: Technical Briefs
J Biomech Eng. September 2009, 131(9): 094502.
Published Online: August 5, 2009
.... Complex foot deformations were induced by single mode loading, e.g., compression, and combined loading, e.g., compression and shear. Small and large indenters were used for heel and metatarsal head loading, an elevated platform was utilized to isolate the rear foot and forefoot, and a full platform...
Journal Articles
Article Type: Research Papers
J Biomech Eng. September 2009, 131(9): 091006.
Published Online: August 5, 2009
... interpretation. To calibrate the model and facilitate further analysis, five human cartilage specimens underwent a number of tests. A series of magnetic resonance imaging (MRI) sequences is taken, next the cartilage surface is imaged, then mechanical indentation tests are completed at 2–7 different locations per...
Journal Articles
Article Type: Research Papers
J Biomech Eng. August 2009, 131(8): 081010.
Published Online: July 6, 2009
...Ahmed Elsheikh; Daad Alhasso; Aachal Kotecha; David Garway-Heath The ocular response analyzer (ORA) is a new indentation tonometer that subjects the cornea to an increasing then decreasing air pulse, and uses the corresponding two applanation pressures P 1 and P 2 to estimate the intraocular...
Journal Articles
Article Type: Research Papers
J Biomech Eng. June 2009, 131(6): 061005.
Published Online: April 27, 2009
... of this work was to further characterize the biomechanical characteristics from stress relaxation and dynamic cyclical indentation testing of normal and damaged articular cartilage and to correlate the biotribological characteristic findings with the biomechanical data. Quasilinear viscoelastic (QLV) theory...
Journal Articles
Article Type: Research Papers
J Biomech Eng. February 2009, 131(2): 021001.
Published Online: December 9, 2008
... osteons using nanoindentation in two orthogonal directions. Since the indentation modulus depends on all elastic constants and, for anisotropic materials, also on the indentation direction, a theoretical model quantifying the indentation modulus from the stiffness tensor of a given material...