A Comparison of the Effects of Specimen Thickness and Subcritical Crack Growth on Several Nonlinear Fracture Toughness Parameters

1976 ◽  
Author(s):  
D. L. Jones ◽  
P. K. Poulose ◽  
H. Liebowitz
Keyword(s):  
Fracture Toughness ◽  
Crack Growth ◽  
Subcritical Crack Growth ◽  
Specimen Thickness ◽  
Nonlinear Fracture

Fracture Toughness and Subcritical Crack Growth in an Alumina/Silicon Carbide ‘Nanocomposite’

1996 ◽  
pp. 179-186 ◽  
Author(s):  
Mark Hoffman ◽  
Jürgen Rödel ◽  
Martin Sternitzke ◽  
Richard Brook
Keyword(s):  
Fracture Toughness ◽  
Silicon Carbide ◽  
Crack Growth ◽  
Subcritical Crack Growth

scholarly journals Related Rule Study of Subcritical Crack Growth and Threshold Values in Transversely Isotropic Slates

Geofluids ◽  
2020 ◽  
Vol 2020 ◽  
pp. 1-15
Author(s):  
Gang Ma ◽  
Jiangteng Li ◽  
Huiwen Wang
Keyword(s):  
Fracture Toughness ◽  
Crack Growth ◽  
Subcritical Crack Growth ◽  
Transversely Isotropic ◽  
Relaxation Method ◽  
Threshold Values ◽  
Load Relaxation ◽  
Bedding Angle ◽  
Constant Displacement ◽  
Double Torsion

Elastic parameters and the subcritical crack growth of different bedding angle slate specimens were studied using uniaxial compression testing and the double torsion constant displacement load relaxation method using SANS and MTS Insight machines. To study the relations of the mode-I stress intensity factor K I versus the subcritical crack growth velocity V , the fracture toughness K I C , the stagnation speed, and the threshold values, the double torsion constant displacement load relaxation method was carried out. The related rules between the bedding angles (β) and the uniaxial compressive strength, fracture toughness, and threshold values were investigated. Experimental results show that the uniaxial compression, the fracture toughness, and the threshold value curves move to the bottom then increase with the increase of the β angle. In addition, its fracture toughness is minimal when the β angle of the slates is 45°, and crack initiation and crack propagation are generated under load, which can lead to the failure of the slate. lg K I - lg V relations of transversely isotropic slates measured by this method are in accordance with linear rules, which is in good agreement with the Charles theory. The range of K 0 / K I C for these different bedding angle slates is from 0.511 to 0.789. The test results would provide the basis for studying seepage and time-dependency of rock engineering stability.

Adsorption and Kinetic Effects on Crack Growth in MnZn Ferrites

2000 ◽  
Vol 15 (6) ◽  
pp. 1377-1388 ◽  
Author(s):  
M. A. H. Donners ◽  
L. J. M. G. Dortmans ◽  
G. de With
Keyword(s):  
Fracture Toughness ◽  
Crack Growth ◽  
Subcritical Crack Growth ◽  
Loading Rate ◽  
Crack Growth Behavior ◽  
Mnzn Ferrite ◽  
Strength Behavior ◽  
Kinetic Effects ◽  
Mnzn Ferrites ◽  
Double Torsion

The variation of the fracture toughness of MnZn ferrite ceramics with varying loading rate and humidity was determined with the aid of the single edge notched beam (SENB) test. A strong decrease with increasing humidity and decreasing loading rate was observed. A model for subcritical crack growth incorporating kinetic and adsorption effects was formulated to analyze the data. The value of the adsorptioncontrolled fracture toughness was determined independently by double torsion experiments and agreed favorably with the values as determined from the SENB data using the model. The strength of the material was determined, and analysis showed a strength behavior similar to the fracture toughness behavior, as predicted by the model. The analysis presented can be used to assess the subcritical crack growth behavior using a limited number of SENB specimens.

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