Abstract
The fracture toughness of dental nanocomposites fabricated by various methods of mixing, silanization, and loadings of nanoparticles had been characterized using fatigue-precracked compact-tension specimens. The fracture mechanisms near the crack tip were characterized using atomic force microscopy (AFM), transmission electron microscopy (TEM), and scanning electron microscopy (SEM). The near-tip fracture processes in the nanocomposties were identified to involve several sequences of fracture events, including: (1) particle bridging, (2) debonding at the poles of particle/matrix interface, and (3) crack deflection around the particles. Analytical and finite-element methods were utilized to model the observed sequences of fracture events to identify the source of fracture toughness in the dental nanocomposites. Theoretical results indicated that silanization and nanoparticle loadings improved the fracture toughness of dental nanocomposites by a factor of 2-3 through a combination of enhanced interface toughness by silanization, crack deflection, as well as crack bridging. A further increase in the fracture toughness of the nanocomposites can be achieved by increasing the fracture toughness of the matrix, nanofilled particles, or the interface.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 1857-1871 |
| Number of pages | 15 |
| Journal | Engineering Fracture Mechanics |
| Volume | 74 |
| Issue number | 12 |
| DOIs | |
| State | Published - Aug 2007 |
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Keywords
- Dental nanocomposites
- Fracture toughness
- Interface engineering
- Toughening mechanisms
ASJC Scopus subject areas
- Mechanical Engineering
- Mechanics of Materials
Cite this
Improving fracture toughness of dental nanocomposites by interface engineering and micromechanics. / Chan, K. S.; Lee, Y. D.; Nicolella, D. P.; Furman, B. R.; Wellinghoff, S.; Rawls, Henry R.
In: Engineering Fracture Mechanics, Vol. 74, No. 12, 08.2007, p. 1857-1871.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Improving fracture toughness of dental nanocomposites by interface engineering and micromechanics
AU - Chan, K. S.
AU - Lee, Y. D.
AU - Nicolella, D. P.
AU - Furman, B. R.
AU - Wellinghoff, S.
AU - Rawls, Henry R
PY - 2007/8
Y1 - 2007/8
N2 - The fracture toughness of dental nanocomposites fabricated by various methods of mixing, silanization, and loadings of nanoparticles had been characterized using fatigue-precracked compact-tension specimens. The fracture mechanisms near the crack tip were characterized using atomic force microscopy (AFM), transmission electron microscopy (TEM), and scanning electron microscopy (SEM). The near-tip fracture processes in the nanocomposties were identified to involve several sequences of fracture events, including: (1) particle bridging, (2) debonding at the poles of particle/matrix interface, and (3) crack deflection around the particles. Analytical and finite-element methods were utilized to model the observed sequences of fracture events to identify the source of fracture toughness in the dental nanocomposites. Theoretical results indicated that silanization and nanoparticle loadings improved the fracture toughness of dental nanocomposites by a factor of 2-3 through a combination of enhanced interface toughness by silanization, crack deflection, as well as crack bridging. A further increase in the fracture toughness of the nanocomposites can be achieved by increasing the fracture toughness of the matrix, nanofilled particles, or the interface.
AB - The fracture toughness of dental nanocomposites fabricated by various methods of mixing, silanization, and loadings of nanoparticles had been characterized using fatigue-precracked compact-tension specimens. The fracture mechanisms near the crack tip were characterized using atomic force microscopy (AFM), transmission electron microscopy (TEM), and scanning electron microscopy (SEM). The near-tip fracture processes in the nanocomposties were identified to involve several sequences of fracture events, including: (1) particle bridging, (2) debonding at the poles of particle/matrix interface, and (3) crack deflection around the particles. Analytical and finite-element methods were utilized to model the observed sequences of fracture events to identify the source of fracture toughness in the dental nanocomposites. Theoretical results indicated that silanization and nanoparticle loadings improved the fracture toughness of dental nanocomposites by a factor of 2-3 through a combination of enhanced interface toughness by silanization, crack deflection, as well as crack bridging. A further increase in the fracture toughness of the nanocomposites can be achieved by increasing the fracture toughness of the matrix, nanofilled particles, or the interface.
KW - Dental nanocomposites
KW - Fracture toughness
KW - Interface engineering
KW - Toughening mechanisms
UR - http://www.scopus.com/inward/record.url?scp=34047242217&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=34047242217&partnerID=8YFLogxK
U2 - 10.1016/j.engfracmech.2006.07.013
DO - 10.1016/j.engfracmech.2006.07.013
M3 - Article
AN - SCOPUS:34047242217
VL - 74
SP - 1857
EP - 1871
JO - Engineering Fracture Mechanics
JF - Engineering Fracture Mechanics
SN - 0013-7944
IS - 12
ER -