A Method For Conducting Automated Fatigue Crack Initiation Tests On Fracture Mechanics Specimens
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A Method For Conducting Automated Fatigue Crack Initiation Tests On Fracture Mechanics Specimens
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Author : PS. Pao
language : en
Publisher:
Release Date : 2002
A Method For Conducting Automated Fatigue Crack Initiation Tests On Fracture Mechanics Specimens written by PS. Pao and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with Constant amplitude categories.
Fatigue crack initiation in notched members is controlled by local strains at the notch root. A number of approaches have been developed for calculating local notch-tip stresses and strains from nominal stress and notch geometry considerations. One such approach uses the parameter ?K/?1/2, where ?K is the fracture mechanics stress intensity range and ? is the notch root radius. The parameter ?K/?1/2 has been shown to correlate with local notch-tip strain and provide a means of normalizing cycles-to-initiation, Ni, data for various notch-tip geometries. Fatigue crack growth rate specimens described in ASTM Test Method for Plane-Strain Fracture Toughness of Metallic Materials (E 399), ASTM Test Method for Measurement of Fatigue Crack Growth Rates (E 647) and elsewhere can be used for fatigue crack initiation testing if they have blunt notches. Data in the form of parameter ?K/?1/2 versus Ni has the same units as the traditional S-N curves. The advantage of having data in the form parameter parameter ?K/?1/2 versus Ni is that information is available on ?K and ? . As in all fracture mechanics testing, data obtained on one specimen geometry can be applied to a wide variety of structural geometries. This approach can be used in conjunction with commercially available software for fatigue crack growth rate testing, servohydraulic testing equipment, and modified fracture mechanics specimens to automate fatigue crack initiation testing. The combination of all of these elements represents a new test method. Results are presented for aluminum alloy 7075, where the effects of corrosion pits were studied and for titanium alloy Ti-6A1-4V, where the effects of heat treatment on initiation were studied.
Automated Test Methods For Fracture And Fatigue Crack Growth
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Author : W. H. Cullen
language : en
Publisher: ASTM International
Release Date : 1985
Automated Test Methods For Fracture And Fatigue Crack Growth written by W. H. Cullen and has been published by ASTM International this book supported file pdf, txt, epub, kindle and other format this book has been release on 1985 with Technology & Engineering categories.
Applications Of Automation Technology In Fatigue And Fracture Testing And Analysis
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Author : Arthur A. Braun
language : en
Publisher: ASTM International
Release Date : 2002
Applications Of Automation Technology In Fatigue And Fracture Testing And Analysis written by Arthur A. Braun and has been published by ASTM International this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with Fatigue testing and analysis categories.
Automation In Fatigue And Fracture
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Author : C. Amzallag
language : en
Publisher: ASTM International
Release Date : 1994
Automation In Fatigue And Fracture written by C. Amzallag and has been published by ASTM International this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with Fracture mechanics categories.
Proceedings Of The National Symposium On Fracture Mechanics
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Author :
language : en
Publisher:
Release Date : 1976
Proceedings Of The National Symposium On Fracture Mechanics written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1976 with Fracture mechanics categories.
Effect Of Load Variables On Fatigue Crack Initiation And Propagation
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Author : D. F. Bryan
language : en
Publisher: ASTM International
Release Date : 1980
Effect Of Load Variables On Fatigue Crack Initiation And Propagation written by D. F. Bryan and has been published by ASTM International this book supported file pdf, txt, epub, kindle and other format this book has been release on 1980 with Technology & Engineering categories.
Applications Of Automation Technology To Fatigue And Fracture Testing And Analysis
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Author : Arthur A. Braun
language : en
Publisher: ASTM International
Release Date : 1997
Applications Of Automation Technology To Fatigue And Fracture Testing And Analysis written by Arthur A. Braun and has been published by ASTM International this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997 with Fracture mechanics categories.
From a November 1995 symposium in Norfolk, Virginia 11 papers report on how computers are playing an ever greater role in testing for fatigue and fracture as applications have become more sophisticated and hardware smaller and more powerful over the past few years. Covering data acquisition, simulat
Developments In Fracture Mechanics Test Methods Standardization
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Author : W. F Brown
language : en
Publisher: ASTM International
Release Date : 1977
Developments In Fracture Mechanics Test Methods Standardization written by W. F Brown and has been published by ASTM International this book supported file pdf, txt, epub, kindle and other format this book has been release on 1977 with categories.
Observations On A Fracture Mechanics Approach To Fatigue Crack Initiation In Ti 6al 4v
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Author : LA. Cooley
language : en
Publisher:
Release Date : 1985
Observations On A Fracture Mechanics Approach To Fatigue Crack Initiation In Ti 6al 4v written by LA. Cooley and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1985 with Crack initiation categories.
Resistance to the initiation of fatigue cracks in Ti-6Al-4V has been determined from blunt-notched (keyhole) and sharp-notched (V) compact specimens of the WOL type. The primary alloy studied was in the mill-annealed condition with an ultimate tensile strength of 1034 MPa (150 ksi). In the case of the blunt-notched specimen, the notch root radius was ? = 1.59 mm (0.0625 in.); for the sharp-notched specimen, ? = 0.25 mm (0.010 in.). The influence of surface roughness, 0.4 ?m versus 1.8 ?m (16 ?in. versus 72 ?in.), on fatigue crack initiation resistance has also been examined. Notch root surfaces were specially prepared to remove all machining marks in the thickness direction. Specimens were cycled under constant load amplitude conditions in air with a stress ratio of R = 0.10. Cycles-to-initiation data normalize very well for the two specimen types when analyzed in terms of the ratio of stress intensity factor range to the square root of the notch root radius, ?K??. The fatigue crack initiation resistance also appears to be independent of surface roughness in the notch root region. Moreover, fatigue crack initiation resistance from these notched compact-type specimens is found to correlate well with fatigue strength determined from smooth, rotating beam specimens of this very same material. Finally, fatigue crack initiation resistance has been measured with the blunt notch compact specimen for a number of beta-annealed Ti-6Al-4V alloys with a broad range of oxygen contents (0.06 to 0.20 wt%). Though oxygen content can have a pronounced influence on fracture toughness, the present data do not indicate a significant influence of oxygen content on fatigue crack initiation resistance.
Case Histories Involving Fatigue And Fracture Mechanics
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Author : C. M. Hudson
language : en
Publisher: ASTM International
Release Date : 1986
Case Histories Involving Fatigue And Fracture Mechanics written by C. M. Hudson and has been published by ASTM International this book supported file pdf, txt, epub, kindle and other format this book has been release on 1986 with Fractura de sólidos categories.