Monitoring of crack growth and crack closure behavior by a simulated acoustic emission technique.
نویسندگان
چکیده
منابع مشابه
Analyses of Fatigue Crack Growth and Closure Near Threshold Conditions for Large-Crack Behavior
A plasticity-induced crack-closure model was used to study fatigue crack growth and closure in thin 2024-T3 aluminum alloy under constant-R and constant-Kmax threshold testing procedures. Two methods of calculating crack-opening stresses were compared. One method was based on contact-K analyses and the other on contact crack-openingdisplacement (COD) analyses. These methods gave nearly identica...
متن کاملAcoustic Emission from a Growing Crack
An analytical method is being developed to determine the signature of an acoustic emission waveform from a growing crack and the results of this analysis are compared to experimentally obtained values. Within the assumptions of linear elastic fracture mechanics, a two dimensional model is developed to examine a semi-infinite crack that, after propagating with a constant velocity, suddenly stops...
متن کاملDetection of crack growth in rail steel using acoustic emission
Increased traffic speeds and axle loads on modern railways enhance rail track degradation. To eliminate track failure due to rail defects, a condition monitoring system requires methods for the early detection of defects which grow in service. Acoustic emission (AE) monitoring is the only non-destructive technique which might be applied online to study the defect growth under traffic loading. H...
متن کاملOn Crack Closure and Crack Tip Shielding during Fatigue Crack Growth
Fatigue crack growth can be strongly influenced by crack closure, i. e., the contacting of the opposing faces of a fatigue crack above the minimum load in a loading cycle. This crack closure shields the crack tip from the full stress field, but different views are held regarding the extent of this shielding. The type of closure, whether it be plasticity-induced, or roughness-induced may also pl...
متن کاملCrack Creation Kinetics Characterization by Electro- Magnetic and Acoustic Emission
Generation of crack is accompanied by generation of electric charges and mechanical vibrations. Electric charges on the crack walls are sources of electric voltage on electrodes (EME signal) and mechanical vibrations generate AE signal. The electric charges located on the cracks walls constitute an electric dipole or quadrupole system. Experimentally we have observed two different type of EME s...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series A
سال: 1989
ISSN: 0387-5008,1884-8338
DOI: 10.1299/kikaia.55.2320