Strain transfer between a CPC coated strain gauge and cortical bone during bending

Nicholas M. Cordaro, Jeffrey A. Weiss, John Szivek

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

The finite element method was used to simulate strain transfer from bone to a calcium phosphate ceramic (CPC) coated strain gauge. The model was constructed using gross morphometric and histological measurements obtained from previous experimental studies. Material properties were assigned based on experiments and information from the literature. Boundary conditions simulated experimental cantilever loading of rat femora. The model was validated using analytical solutions based on the theory of elasticity as well as direct comparison to experimental data obtained in a separate study. The interface between the bone and strain gauge sensing surface consisted of layers of polysulfone, polysulfone/CPC, and CPC/ bone. Parameter studies examined the effect of interface thickness and modulus, gauge geometry, partial gauge debonding, and waterproofing on the strain transfer from the bone to the gauge sensing element. Results demonstrated that interface thickness and modulus have a significant effect on strain transfer. Optimal strain transfer was achieved for an interface modulus of approximately 2 GPa. Strain transfer decreased consistently with increasing interface thickness. Debonding along the lateral edges of the gauge had little effect, while debonding proximal and distal to the sensing element decreased strain transfer. A water-proofing layer decreased strain transfer, and this effect was more pronounced as the modulus or thickness of the layer increased. Based on these simulations, specific recommendations were made to optimize strain transfer between bone and CPC coated gauges for experimental studies.

Original languageEnglish (US)
Pages (from-to)147-155
Number of pages9
JournalJournal of Biomedical Materials Research
Volume58
Issue number2
DOIs
StatePublished - 2001

Fingerprint

Calcium phosphate
Strain gages
Bone
Gages
Debonding
Polysulfones
Waterproofing
calcium phosphate
Rats
Elasticity
Materials properties
Boundary conditions
Finite element method
Geometry
Water

Keywords

  • Bone
  • Finite element analysis
  • Strain gauge
  • Strain measurement

ASJC Scopus subject areas

  • Biomedical Engineering
  • Biomaterials

Cite this

Strain transfer between a CPC coated strain gauge and cortical bone during bending. / Cordaro, Nicholas M.; Weiss, Jeffrey A.; Szivek, John.

In: Journal of Biomedical Materials Research, Vol. 58, No. 2, 2001, p. 147-155.

Research output: Contribution to journalArticle

@article{044308532ee24a9b9a4c7e8350d9cb3b,
title = "Strain transfer between a CPC coated strain gauge and cortical bone during bending",
abstract = "The finite element method was used to simulate strain transfer from bone to a calcium phosphate ceramic (CPC) coated strain gauge. The model was constructed using gross morphometric and histological measurements obtained from previous experimental studies. Material properties were assigned based on experiments and information from the literature. Boundary conditions simulated experimental cantilever loading of rat femora. The model was validated using analytical solutions based on the theory of elasticity as well as direct comparison to experimental data obtained in a separate study. The interface between the bone and strain gauge sensing surface consisted of layers of polysulfone, polysulfone/CPC, and CPC/ bone. Parameter studies examined the effect of interface thickness and modulus, gauge geometry, partial gauge debonding, and waterproofing on the strain transfer from the bone to the gauge sensing element. Results demonstrated that interface thickness and modulus have a significant effect on strain transfer. Optimal strain transfer was achieved for an interface modulus of approximately 2 GPa. Strain transfer decreased consistently with increasing interface thickness. Debonding along the lateral edges of the gauge had little effect, while debonding proximal and distal to the sensing element decreased strain transfer. A water-proofing layer decreased strain transfer, and this effect was more pronounced as the modulus or thickness of the layer increased. Based on these simulations, specific recommendations were made to optimize strain transfer between bone and CPC coated gauges for experimental studies.",
keywords = "Bone, Finite element analysis, Strain gauge, Strain measurement",
author = "Cordaro, {Nicholas M.} and Weiss, {Jeffrey A.} and John Szivek",
year = "2001",
doi = "10.1002/1097-4636(2001)58:2<147::AID-JBM1001>3.0.CO;2-M",
language = "English (US)",
volume = "58",
pages = "147--155",
journal = "Journal of Biomedical Materials Research - Part A",
issn = "0021-9304",
publisher = "John Wiley and Sons Inc.",
number = "2",

}

TY - JOUR

T1 - Strain transfer between a CPC coated strain gauge and cortical bone during bending

AU - Cordaro, Nicholas M.

AU - Weiss, Jeffrey A.

AU - Szivek, John

PY - 2001

Y1 - 2001

N2 - The finite element method was used to simulate strain transfer from bone to a calcium phosphate ceramic (CPC) coated strain gauge. The model was constructed using gross morphometric and histological measurements obtained from previous experimental studies. Material properties were assigned based on experiments and information from the literature. Boundary conditions simulated experimental cantilever loading of rat femora. The model was validated using analytical solutions based on the theory of elasticity as well as direct comparison to experimental data obtained in a separate study. The interface between the bone and strain gauge sensing surface consisted of layers of polysulfone, polysulfone/CPC, and CPC/ bone. Parameter studies examined the effect of interface thickness and modulus, gauge geometry, partial gauge debonding, and waterproofing on the strain transfer from the bone to the gauge sensing element. Results demonstrated that interface thickness and modulus have a significant effect on strain transfer. Optimal strain transfer was achieved for an interface modulus of approximately 2 GPa. Strain transfer decreased consistently with increasing interface thickness. Debonding along the lateral edges of the gauge had little effect, while debonding proximal and distal to the sensing element decreased strain transfer. A water-proofing layer decreased strain transfer, and this effect was more pronounced as the modulus or thickness of the layer increased. Based on these simulations, specific recommendations were made to optimize strain transfer between bone and CPC coated gauges for experimental studies.

AB - The finite element method was used to simulate strain transfer from bone to a calcium phosphate ceramic (CPC) coated strain gauge. The model was constructed using gross morphometric and histological measurements obtained from previous experimental studies. Material properties were assigned based on experiments and information from the literature. Boundary conditions simulated experimental cantilever loading of rat femora. The model was validated using analytical solutions based on the theory of elasticity as well as direct comparison to experimental data obtained in a separate study. The interface between the bone and strain gauge sensing surface consisted of layers of polysulfone, polysulfone/CPC, and CPC/ bone. Parameter studies examined the effect of interface thickness and modulus, gauge geometry, partial gauge debonding, and waterproofing on the strain transfer from the bone to the gauge sensing element. Results demonstrated that interface thickness and modulus have a significant effect on strain transfer. Optimal strain transfer was achieved for an interface modulus of approximately 2 GPa. Strain transfer decreased consistently with increasing interface thickness. Debonding along the lateral edges of the gauge had little effect, while debonding proximal and distal to the sensing element decreased strain transfer. A water-proofing layer decreased strain transfer, and this effect was more pronounced as the modulus or thickness of the layer increased. Based on these simulations, specific recommendations were made to optimize strain transfer between bone and CPC coated gauges for experimental studies.

KW - Bone

KW - Finite element analysis

KW - Strain gauge

KW - Strain measurement

UR - http://www.scopus.com/inward/record.url?scp=0035086338&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0035086338&partnerID=8YFLogxK

U2 - 10.1002/1097-4636(2001)58:2<147::AID-JBM1001>3.0.CO;2-M

DO - 10.1002/1097-4636(2001)58:2<147::AID-JBM1001>3.0.CO;2-M

M3 - Article

C2 - 11241333

AN - SCOPUS:0035086338

VL - 58

SP - 147

EP - 155

JO - Journal of Biomedical Materials Research - Part A

JF - Journal of Biomedical Materials Research - Part A

SN - 0021-9304

IS - 2

ER -