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

scholarly journals Effect of Environment and Multiaxial Stress States on Subcritical Crack Growth of Machinable Ceramics.

1993 ◽  
Vol 59 (558) ◽  
pp. 319-324
Author(s):  
Kiyohiko Ikeda ◽  
Toshiya Suzuki ◽  
Minoru Tamiaki ◽  
Yoshinobu Tanigawa ◽  
Hisashi Igaki
Keyword(s):  
Crack Growth ◽  
Subcritical Crack Growth ◽  
Multiaxial Stress ◽  
Stress States

Lifetime Prediction for Ceramic Gas Turbine Components

1993 ◽  
Vol 115 (1) ◽  
pp. 70-75 ◽  
Author(s):  
G. Stu¨rmer ◽  
A. Schulz ◽  
S. Wittig
Keyword(s):  
Gas Turbine ◽  
Crack Growth ◽  
Subcritical Crack Growth ◽  
Operation Time ◽  
Computer Code ◽  
Experimental Investigations ◽  
Ceramic Components ◽  
Stress States ◽  
Dependent Failure ◽  
Failure Probabilities

At the Institute for Thermal Turbomachinery, University of Karlsruhe (ITS), theoretical and experimental investigations of ceramic gas turbine components are performed. For the reliability analysis by finite element calculations the computer code CERITS has been developed. This code is used to determine the fast fracture reliability of ceramic components subjected to polyaxial stress states with reference to volumetric flaws and was presented at the 1990 IGTI Gas Turbine Conference. CERITS-L now includes subcritical crack growth. With the new code CERITS-L, failure probabilities of ceramic components can be calculated under given load situations versus time. In comparing these time-dependent failure probabilities with a given permissible failure probability, the maximum operation time of a component can be determined. The considerable influence of the subcritical crack growth upon the lifetime of ceramic components is demonstrated at the flame tube segments of the ITS ceramic combustor.

Life Time Prediction for Ceramic Gas Turbine Components

1991 ◽  
Author(s):  
G. Stürmer ◽  
A. Schulz ◽  
S. Wittig
Keyword(s):  
Gas Turbine ◽  
Crack Growth ◽  
Subcritical Crack Growth ◽  
Operation Time ◽  
Life Time ◽  
Computer Code ◽  
Experimental Investigations ◽  
Ceramic Components ◽  
Stress States ◽  
Failure Probabilities

At the Institute for Thermal Turbomachinery, University of Karlsruhe (ITS), theoretical and experimental investigations on ceramic gas turbine components are performed. For the reliability analysis by finite element calculations the computer code CERITS has been developed. This code is used to determine the fast fracture reliability of ceramic components subjected to polyaxial stress states with reference to volumetric flaws and was presented at the 1990 IGTI Gas Turbine Conference. CERITS-L now includes subcritical crack growth. With the new code CERITS-L, failure probabilities of ceramic components can be calculated under given load situations versus time. In comparing these time dependent failure probabilities with a given permissible failure probability, the maximum operation time of a component can be determined. The considerable influence of the subcritical crack growth upon the life time of ceramic components is demonstrated at the flame tube segments of the ITS ceramic combustor.

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

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.

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
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