scholarly journals Sensitivity of an Ultrasonic Technique for Axial Stress Determination

1988 ◽  
pp. 1405-1412 ◽  
Author(s):  
B. Cunningham ◽  
A. C. Holt ◽  
G. C. Johnson
Keyword(s):  
Axial Stress ◽  
Ultrasonic Technique ◽  
Stress Determination

scholarly journals An Ultrasonic Technique for Axial Bolt-Stress Determination

1987 ◽  
pp. 1549-1557 ◽  
Author(s):  
Albert C. Holt ◽  
Bruce Cunningham ◽  
George C. Johnson ◽  
David Auslander
Keyword(s):  
Ultrasonic Technique ◽  
Stress Determination ◽  
Bolt Stress

Evaluation of Bolt Axial Stress Based on Nonlinear Ultrasonic Technique

2020 ◽  
Author(s):  
Qinxue Pan ◽  
Meile Chang ◽  
Shuangyang Li ◽  
Xiaoyu Xu ◽  
Ruipeng Pan ◽  
...  
Keyword(s):  
Axial Stress ◽  
Ultrasonic Technique ◽  
Nonlinear Ultrasonic

Stress Relaxation in Aluminum Welding Using Ultrasonic Method

2007 ◽  
Author(s):  
Marcilio H. Andrino ◽  
Auteliano A. dos Santos ◽  
Don E. Bray ◽  
Roseana E. Trevisan
Keyword(s):  
Heat Treatment ◽  
Stress Relaxation ◽  
Stress Field ◽  
Axial Stress ◽  
Ultrasonic Method ◽  
Rolling Direction ◽  
Stress Relief ◽  
Ultrasonic Technique ◽  
Stress Region ◽  
Refracted Waves

Stress relaxation of welded joints can increase the safety of structures. Although it is not absolutely clear why it happens, several researches have proved the phenomenon. This work presents the application of the ultrasonic technique to evaluate the stress relaxation in welds of 5052 aluminum. A special geometry was developed, so each welded plate had uni-axial stresses in the measurement region. Twenty-two plates were tested, eleven in the rolling direction and the remaining in the perpendicular direction. The plates were stress relief using a heat treatment to set an initial stress free reference state. After that, they were welded to create the stress field in the area of investigation. A final step was to cut each of the samples after different periods of time from the welding. The stress was measured in the uni-axial stress region. A calendar of the process was established to record precisely the time for each step. Longitudinal critically refracted waves were used to measure the stresses. The results showed a clear effect of relaxation. The magnitude was not as pronounced as in steel, but kept the same relation with the ultimate strength of material.

Physical and Elastic Properties of Mixed Alkali Borate Glasses Using Ultrasonic Technique

2011 ◽  
Vol 3 (9) ◽  
pp. 429-431
Author(s):  
P.Vasantharani P.Vasantharani ◽  
◽  
N. Sangeetha N. Sangeetha
Keyword(s):  
Elastic Properties ◽  
Borate Glasses ◽  
Ultrasonic Technique ◽  
Mixed Alkali ◽  
Alkali Borate Glasses

A Practical Ultrasonic Inspection Method for Detecting and Characterising Defects Found Within Composite Repairs

2018 ◽  
Author(s):  
J Downing ◽  
A Hook
Keyword(s):  
Wall Thickness ◽  
Steel Substrate ◽  
Ultrasonic Method ◽  
Ultrasonic Inspection ◽  
Heat Exposure ◽  
Matrix Cracking ◽  
Ultrasonic Technique ◽  
Inspection Method ◽  
Composite Repairs ◽  
Layered Matrix

Two steel substrate test panels were developed to represent common plate thicknesses found on naval vessels and scanned using the Babcock developed ultrasonic technique. One sample comprised of a series of slotted surface breaking flaws of varying widths and through thicknesses to represent fracturing/cracking. The inspection method detected simulated cracking to a depth of 2mm and 0.5mm in width. The second sample included numerous loss of wall thickness areas of varying diameters and through thicknesses, with the smallest detectable loss of wall thickness being 0.1mm at a 15mm diameter. After proving confidence in detection, there was a need to characterise flaws to provide support and ascertain a repair action. Samples were produced that were subjected to either impact or heat exposure to induce realistic representative damage. The practical ultrasonic method was successfully used to independently characterise between the samples, with induced de-laminations caused by blisters, and multi layered matrix cracking caused by varying levels of projectile impacts, due to their unique morphology.

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