Subcritical crack growth in porcelains, glass-ceramics, and glass-infiltrated alumina composite for dental restorations

2008 ◽  
Vol 20 (5) ◽  
Author(s):  
Carla Castiglia Gonzaga ◽  
Humberto Naoyuki Yoshimura ◽  
Paulo Francisco Cesar ◽  
Walter Gomes Miranda
Keyword(s):  
Crack Growth ◽  
Subcritical Crack Growth ◽  
Glass Ceramics ◽  
Dental Restorations ◽  
Alumina Composite

Subcritical Crack Growth Velocities (v-K Curves) of Dental Bioceramics

2012 ◽  
Vol 727-728 ◽  
pp. 1211-1216 ◽  
Author(s):  
Humberto Naoyuki Yoshimura ◽  
Carla Cristina Gonzaga ◽  
Paulo Francisco Cesar ◽  
Walter Gomes Miranda
Keyword(s):  
Crack Growth ◽  
Growth Velocity ◽  
Ceramic Composite ◽  
Subcritical Crack Growth ◽  
Artificial Saliva ◽  
Glass Ceramics ◽  
Velocity Versus ◽  
Factor V ◽  
Alumina Composite ◽  
Crack Growth Velocity

In this study the subcritical crack growth (SCG) behaviors of five dental bioceramics were evaluated in order to plot the crack growth velocity versus stress intensity factor (v-K) curves. Disc-shaped samples of two sintered porcelains, two glass-ceramics, and a glass-infiltrated ceramic composite were prepared and tested in artificial saliva using a biaxial flexure jig. The SCG parameters were evaluated by the dynamic fatigue test using five constant stress-rates and in an inert condition. Among the tested materials, the lithium disilicate glass-ceramic showed the highest susceptibility to strength degradation by SCG, whereas the glass infiltrated alumina composite showed the lowest susceptibility. The v-K curves showed that the SCG susceptibility significantly affects the crack growth velocity of the different bioceramics.

scholarly journals Evaluation of Subcritical Crack Growth in Glass Ceramics. Examination by Double Torsion Technique.

1997 ◽  
Vol 63 (607) ◽  
pp. 493-498 ◽  
Author(s):  
Kiyohiko IKEDA ◽  
Takaaki INOTANI ◽  
Koichi KAIZU ◽  
Hisashi IGAKI ◽  
Hiroyosi KIHARA
Keyword(s):  
Crack Growth ◽  
Subcritical Crack Growth ◽  
Glass Ceramics ◽  
Double Torsion

The roles of microstructure and surface energy on subcritical crack growth in glass-ceramics

2020 ◽  
Author(s):  
Pamela Ricco ◽  
Nathália de Carvalho Ramos ◽  
Tiago Moreira Bastos Campos ◽  
Viviane Oliveira Soares ◽  
Mariana de Oliveira Carlos Villas Boas ◽  
...  
Keyword(s):  
Surface Energy ◽  
Crack Growth ◽  
Subcritical Crack Growth ◽  
Glass Ceramics

scholarly journals Effect of environment and polyaxial stress states on subcritical crack growth in glass ceramics.

1990 ◽  
Vol 56 (525) ◽  
pp. 1116-1122
Author(s):  
Kiyohiko IKEDA ◽  
Hisashi IGAKI ◽  
Yoshinobu TANIGAWA ◽  
Koichiro TAGASHIRA
Keyword(s):  
Crack Growth ◽  
Subcritical Crack Growth ◽  
Glass Ceramics ◽  
Stress States

Examination of Fracture Interfaces in Silicon Nitride

1975 ◽  
Vol 33 ◽  
pp. 60-61
Author(s):  
Nancy J. Tighe
Keyword(s):  
Silicon Nitride ◽  
Grain Boundary ◽  
Crack Growth ◽  
Subcritical Crack Growth ◽  
Slow Crack Growth ◽  
Ceramic Materials ◽  
Grain Boundary Sliding ◽  
Boundary Phase ◽  
Turbine Engines ◽  
Boundary Sliding

Silicon nitride is one of the ceramic materials being considered for the components in gas turbine engines which will be exposed to temperatures of 1000 to 1400°C. Test specimens from hot-pressed billets exhibit flexural strengths of approximately 50 MN/m2 at 1000°C. However, the strength degrades rapidly to less than 20 MN/m2 at 1400°C. The strength degradition is attributed to subcritical crack growth phenomena evidenced by a stress rate dependence of the flexural strength and the stress intensity factor. This phenomena is termed slow crack growth and is associated with the onset of plastic deformation at the crack tip. Lange attributed the subcritical crack growth tb a glassy silicate grain boundary phase which decreased in viscosity with increased temperature and permitted a form of grain boundary sliding to occur.

Subcritical Crack Growth and Long-Term Strength in Rock and High-Strength and Ultra Low-Permeability Concrete

2009 ◽  
Vol 58 (6) ◽  
pp. 525-532 ◽  
Author(s):  
Yoshitaka NARA ◽  
Masafumi TAKADA ◽  
Daisuke MORI ◽  
Hitoshi OWADA ◽  
Tetsuro YONEDA ◽  
...  
Keyword(s):  
Crack Growth ◽  
Subcritical Crack Growth ◽  
High Strength ◽  
Low Permeability ◽  
Term Strength
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