Untersuchung des subkritischen Rißwachstums mit Methoden der Bruchmechanik / Investigation of subcritical crack growth with the tool of fracture mechanics / Examen de l’agrandissement subcritique de criques à l’aide de méthodes de la mécanique des ruptures

1971 ◽  
Vol 13 (6) ◽  
pp. 181-186
Author(s):  
Axel Fuchs
Keyword(s):  
Fracture Mechanics ◽  
Crack Growth ◽  
Subcritical Crack Growth

Stress Corrosion Cracking of En 31 Ball Race Steel Using Fracture Mechanics Methods of Analysis

1971 ◽  
Vol 13 (2) ◽  
pp. 61-64 ◽  
Author(s):  
B. G. Cox ◽  
E. G. Ellison
Keyword(s):  
High Pressure ◽  
Stress Intensity ◽  
Fracture Mechanics ◽  
Ethylene Glycol ◽  
Crack Growth ◽  
Subcritical Crack Growth ◽  
Diesel Oil ◽  
Intensity Threshold ◽  
Measurement And Analysis ◽  
En 31

Subcritical crack growth was studied in an En 31 ball race steel subjected to various fluids, some of which are suitable for possible use in high pressure applications. Using fracture mechanics techniques of measurement and analysis, it was found that Esso Univis P38, Shell Tellus 15, and a 25 per cent glycerine–ethylene glycol mixture caused subcritical crack growth with a corrosion stress intensity threshold approximately half that obtained in air. Diesel oil had no effect. Evidence of blunting of the crack system and some effects of history were found.

scholarly journals Analysis of subcritical crack growth in dental ceramics using fracture mechanics and fractography

2008 ◽  
Vol 24 (5) ◽  
pp. 700-707 ◽  
Author(s):  
Burak Taskonak ◽  
Jason A. Griggs ◽  
John J. Mecholsky ◽  
Jia-Hau Yan
Keyword(s):  
Fracture Mechanics ◽  
Crack Growth ◽  
Subcritical Crack Growth ◽  
Dental Ceramics

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

Fracture mechanics in design and service: ‘living with defects’ - Application of fracture mechanics to rubber articles, including tyres

1981 ◽  
Vol 299 (1446) ◽  
pp. 189-202 ◽  
Keyword(s):  
Fracture Mechanics ◽  
Crack Growth ◽  
Strain Energy ◽  
Tensile Failure ◽  
Practical Application ◽  
Complicated Fracture ◽  
Fracture Work

The use of a fracture mechanics approach, based on the rate of release of strain energy, to account for various features of the failure of vulcanized rubbers is outlined. The properties considered include those to which fracture mechanics is often applied — tear, tensile failure, crack growth and fatigue — and others to which its application is less usual — abrasion, ozone attack and cutting by sharp objects. The relation of macroscopically observed properties to the basic molecular strength of the material is also discussed. An example of a quantitative practical application of the rubber fracture work, to groove cracking in tyres, is then considered. Finally, the rather more complicated fracture that can occur in rubber—cord laminates is discussed and it is shown that the energetics approach can be applied to some features, at least, of this.

Effective Modeling of Fatigue Crack Growth in Pipelines

2012 ◽  
Author(s):  
Steven J. Polasik ◽  
Carl E. Jaske
Keyword(s):  
Fatigue Crack ◽  
Stress Intensity ◽  
Fatigue Crack Growth ◽  
Fracture Mechanics ◽  
Crack Growth ◽  
Growth Models ◽  
Critical Parameters ◽  
Operating Pressure ◽  
Mechanics Model ◽  
Key Variables

Pipeline operators must rely on fatigue crack growth models to evaluate the effects of operating pressure acting on flaws within the longitudinal seam to set re-assessment intervals. In most cases, many of the critical parameters in these models are unknown and must be assumed. As such, estimated remaining lives can be overly conservative, potentially leading to unrealistic and short reassessment intervals. This paper describes the fatigue crack growth methodology utilized by Det Norske Veritas (USA), Inc. (DNV), which is based on established fracture mechanics principles. DNV uses the fracture mechanics model in CorLAS™ to calculate stress intensity factors using the elastic portion of the J-integral for either an elliptically or rectangularly shaped surface crack profile. Various correction factors are used to account for key variables, such as strain hardening rate and bulging. The validity of the stress intensity factor calculations utilized and the effect of modifying some key parameters are discussed and demonstrated against available data from the published literature.

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