THE EFFECT OF STATIC TENSILE BIAS STRESS UPON THE SOLUBILITY LIMIT OF HYDROGEN IN NIOBIUM CRYSTALS USING THE ULTRASONIC TECHNIQUE

1985 ◽  
Vol 46 (C10) ◽  
pp. C10-115-C10-118 ◽  
Author(s):  
O. FLORENCIO ◽  
D. G. PINATTI ◽  
J. M. ROBERTS
Keyword(s):  
Solubility Limit ◽  
Ultrasonic Technique ◽  
Bias Stress ◽  
Static Tensile

Investigation of Lamb Wave Based Ultrasonic Technique for AA2024 Evaluation at Static Tensile Loading

2016 ◽  
Vol 685 ◽  
pp. 394-398
Author(s):  
Anton V. Byakov ◽  
Alexander V. Eremin ◽  
Mikhail V. Burkov ◽  
Ronak T. Shah ◽  
Pavel S. Lyubutin ◽  
...  
Keyword(s):  
Lamb Wave ◽  
Strain State ◽  
Tensile Loading ◽  
Tensile Tests ◽  
Epoxy Adhesive ◽  
Piezoelectric Transducers ◽  
Ultrasonic Technique ◽  
Informative Parameters ◽  
Static Tensile Loading ◽  
Static Tensile

In the paper the results of Lamb wave ultrasonic technique for evaluation of AA2024T3 specimens during tensile testing are presented. Three piezoelectric transducers (PZT) used as an actuator and two sensors were glued on the specimen surface using epoxy adhesive. Two frequencies of testing signals (50 kHz and 335 kHz) were used. The set of static tensile tests were performed. The recorded signals were processed to calculate the informative parameters to evaluate the changes of the stress-strain state of the specimen and its microstructure.

Evaporation of lignin-lean black liquor

TAPPI Journal ◽  
2015 ◽  
Vol 14 (7) ◽  
pp. 441-450
Author(s):  
HENRIK WALLMO, ◽  
ULF ANDERSSON ◽  
MATHIAS GOURDON ◽  
MARTIN WIMBY
Keyword(s):  
Heat Transfer ◽  
Heat Transfer Coefficient ◽  
Transfer Coefficient ◽  
Black Liquor ◽  
Salt Content ◽  
Solubility Limit ◽  
Lignin Removal ◽  
Kraft Black Liquor ◽  
Black Liquors ◽  
The Heat Transfer Coefficient

Many of the pulp mill biorefinery concepts recently presented include removal of lignin from black liquor. In this work, the aim was to study how the change in liquor chemistry affected the evaporation of kraft black liquor when lignin was removed using the LignoBoost process. Lignin was removed from a softwood kraft black liquor and four different black liquors were studied: one reference black liquor (with no lignin extracted); two ligninlean black liquors with a lignin removal rate of 5.5% and 21%, respectively; and one liquor with maximum lignin removal of 60%. Evaporation tests were carried out at the research evaporator in Chalmers University of Technology. Studied parameters were liquor viscosity, boiling point rise, heat transfer coefficient, scaling propensity, changes in liquor chemical composition, and tube incrustation. It was found that the solubility limit for incrustation changed towards lower dry solids for the lignin-lean black liquors due to an increased salt content. The scaling obtained on the tubes was easily cleaned with thin liquor at 105°C. It was also shown that the liquor viscosity decreased exponentially with increased lignin outtake and hence, the heat transfer coefficient increased with increased lignin outtake. Long term tests, operated about 6 percentage dry solids units above the solubility limit for incrustation for all liquors, showed that the heat transfer coefficient increased from 650 W/m2K for the reference liquor to 1500 W/m2K for the liquor with highest lignin separation degree, 60%.

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.

Simultaneous measurement of atmospheric moisture and temperature in the presence of suspended particulates using ultrasonic technique

2020 ◽  
Vol 59 (9) ◽  
pp. 096503
Author(s):  
Nairit Das ◽  
Neha Bhattacharyya ◽  
Soumendra Singh ◽  
Animesh Halder ◽  
Deep Shikha ◽  
...  
Keyword(s):  
Simultaneous Measurement ◽  
Ultrasonic Technique ◽  
Atmospheric Moisture ◽  
Suspended Particulates

Solubility Limit and Annealing Effects on the Microstructure & Thermoelectricproperties of Fe 2V 1-XTa xAl 1-YSi y Heusler Compounds

2021 ◽  
Author(s):  
Fabian Garmroudi ◽  
Michael Parzer ◽  
Alexander Riss ◽  
Nikolas Reumann ◽  
Bernhard Hinterleitner ◽  
...  
Keyword(s):  
Solubility Limit ◽  
Heusler Compounds ◽  
Annealing Effects
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