Driving outage times down and improving joint integrity using bolt tensioning

1998 ◽  
Author(s):  
T.C. Lewis
Keyword(s):  
Joint Integrity

Assessing joint integrity of a lug assembly using piezoelectric active sensors

2012 ◽  
Vol 19 (7) ◽  
pp. 621-631 ◽  
Author(s):  
Hye-Jin Shin ◽  
Chang-Yong Yun ◽  
Gyuhae Park ◽  
Kevin M. Farinholt ◽  
Jung-Ryul Lee ◽  
...  
Keyword(s):  
Active Sensors ◽  
Joint Integrity

Joint integrity

1994 ◽  
pp. 191-209
Author(s):  
Norman Bailey
Keyword(s):  
Joint Integrity

Engine Mount Stiffness Effect on Joint Integrity and Durability

2021 ◽  
Author(s):  
Sagar Deshmukh ◽  
Sandip Hazra ◽  
Hariprasad Soundarrajan
Keyword(s):  
Engine Mount ◽  
Joint Integrity

scholarly journals Biochemical Signals Mediate the Crosstalk between Cartilage and Bone in Osteoarthritis

2020 ◽  
Vol 2020 ◽  
pp. 1-8
Author(s):  
Xuchang Zhou ◽  
Hong Cao ◽  
Yu Yuan ◽  
Wei Wu
Keyword(s):  
Subchondral Bone ◽  
Essential Role ◽  
Bone Remodelling ◽  
Functional Unit ◽  
Subchondral Bone Plate ◽  
Calcified Cartilage ◽  
Osteoarthritis Treatment ◽  
And Function ◽  
Biochemical Signals ◽  
Joint Integrity

Osteochondral junction is a functional unit comprising the articular cartilage, calcified cartilage, and subchondral bone. Alteration in any component of this composite unit can disrupt the joint integrity and function directly or indirectly. Biochemical signals mediate the crosstalk between tissues and play an essential role in the initiation and progression of osteoarthritis. As osteoarthritis progresses, abnormal subchondral bone remodelling leads to increased angiogenesis and porosity of the subchondral bone plate, which further triggers biochemical signals to mediate the crosstalk between cartilage and bone, contributing to the progression of osteoarthritis. Notably, common biochemical signals include the TGF-β/Smad, Wnt/β-catenin, RANK/RANKL/OPG, and MAPK pathways. This biomarker crosstalk network is the basis of osteoarthritis pathogenesis, and some of their key regulators may be potential therapeutic targets for osteoarthritis drug therapy. This review summarised the biochemical crosstalk between cartilage and bone in the pathogenesis of osteoarthritis, which may provide the basis for the discovery of osteoarthritis treatment targets.

Ultrasonic Phased Array: Detection of Detrimental Conditions in High-Density Polyethylene Butt-Fusion Joints

2010 ◽  
Author(s):  
Caleb J. Frederick
Keyword(s):  
High Density Polyethylene ◽  
Nuclear Power ◽  
Power Plants ◽  
Phased Array ◽  
Cold Fusion ◽  
High Density ◽  
Visual Examination ◽  
Full Spectrum ◽  
Ultrasonic Phased Array ◽  
Joint Integrity

Today, commercial nuclear power plants are installing High-Density Polyethylene (HDPE) in non-safety-related and safety-related applications. While this material has numerous advantages over the carbon steel pipes that historically have been used for the same applications, developing a way to accurately inspect for joint integrity in HDPE has become increasingly important to utilities and the U.S. Nuclear Regulatory Commission (USNRC). This paper will investigate the ability to quantify the levels of detection of flaws and detrimental conditions using ultrasonic phased array, in butt-fusion joints throughout the full spectrum of applicable HDPE pipe diameters and wall-thicknesses. Perhaps the most concerning joint condition is that of “Cold Fusion”. A cold-fused joint is created when molecules along the fusion line do not fully entangle or co-crystallize. Once the fusion process is complete, during visual examination, there is the appearance of a good quality joint. However, the joint does not have the strength needed, as the required co-crystallization along the pipe faces has not occurred. Performing a visual examination of the bead, as required by the current revision of ASME Code Case N-755, does not provide adequate guarantee of joint integrity. Therefore, volumetric examination is of special concern to the USNRC to safeguard against this type of detrimental condition. Factors addressed will include pipe diameter, wall-thickness, fusing temperature, interfacial pressure, dwell (open/close) time, and destructive verification of ultrasonic data.

Ultrasonic measurement of self-loosening in bolted joints

2011 ◽  
Vol 226 (7) ◽  
pp. 1869-1884 ◽  
Author(s):  
MB Marshall ◽  
R Lewis ◽  
T Howard ◽  
H Brunskill
Keyword(s):  
Steady State ◽  
Ultrasonic Measurement ◽  
Bolted Joints ◽  
Catastrophic Failure ◽  
Interface Pressure ◽  
Rapid Reduction ◽  
Contact Conditions ◽  
Joint Integrity ◽  
Clamping Pressure ◽  
Insight Into

Self-loosening of bolted joints in response to vibration can lead to the catastrophic failure of a range of engineering components and structures. Many techniques employed to study this phenomenon focus on directly measuring the pre-load remaining in the bolt itself, and offer little insight into the behaviour of the clamped interface. In this study, a non-intrusive ultrasonic reflection-based technique is used to first characterize interface pressure in the joint, and then determine the rate at which relaxation occurs. A key advantage of the technique is that it does not require the modification of the contact conditions, and rather utilizes the spring-like behaviour of a rough surface interface when subject to ultrasonic excitation. A series of different bolt torques were investigated, along with the inclusion of both plain and spring washers under the bolt head. All test samples were subjected to an oscillating fixed–displacement vibration cycle. An initial rapid reduction in interface clamping pressure was observed, followed by a more steady-state period. Increasing bolt torque was seen to enhance joint integrity, whereas both the plain and spring washers showed little improvement. The spring washer was observed to extend the secondary steady-state phase of loosening, though as the majority of pre-load was removed prior to this period any change was largely unbeneficial.

Papers Survey of cull sow bone and joint integrity in the Moorepark Research Farm herd

2010 ◽  
Vol 166 (9) ◽  
pp. 268-271 ◽  
Author(s):  
W. F. Ryan ◽  
P. B. Lynch ◽  
J. V. O'Doherty
Keyword(s):  
Joint Integrity
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