Asset/mechanical integrity: A PSM element that still bedevils

2021 ◽  
Author(s):  
Michael J. Hazzan ◽  
Ken W. Min
Keyword(s):  
Mechanical Integrity

scholarly journals Quantitative Evaluation of Osteocyte Morphology and Bone Anisotropic Extracellular Matrix in Rat Femur

2021 ◽  
Author(s):  
Takuya Ishimoto ◽  
Keita Kawahara ◽  
Aira Matsugaki ◽  
Hiroshi Kamioka ◽  
Takayoshi Nakano
Keyword(s):  
Extracellular Matrix ◽  
Longitudinal Axis ◽  
Rat Femur ◽  
Male Rat ◽  
Mechanical Stimuli ◽  
Axis Orientation ◽  
Principal Stress Direction ◽  
Mechanical Integrity ◽  
Osteocyte Lacunae ◽  
The Relationship

AbstractOsteocytes are believed to play a crucial role in mechanosensation and mechanotransduction which are important for maintenance of mechanical integrity of bone. Recent investigations have revealed that the preferential orientation of bone extracellular matrix (ECM) mainly composed of collagen fibers and apatite crystallites is one of the important determinants of bone mechanical integrity. However, the relationship between osteocytes and ECM orientation remains unclear. In this study, the association between ECM orientation and anisotropy in the osteocyte lacuno-canalicular system, which is thought to be optimized along with the mechanical stimuli, was investigated using male rat femur. The degree of ECM orientation along the femur longitudinal axis was significantly and positively correlated with the anisotropic features of the osteocyte lacunae and canaliculi. At the femur middiaphysis, there are the osteocytes with lacunae that highly aligned along the bone long axis (principal stress direction) and canaliculi that preferentially extended perpendicular to the bone long axis, and the highest degree of apatite c-axis orientation along the bone long axis was shown. Based on these data, we propose a model in which osteocytes can change their lacuno-canalicular architecture depending on the mechanical environment so that they can become more susceptible to mechanical stimuli via fluid flow in the canalicular channel.

scholarly journals Oxidation of Thin Nickel-Based Superalloy Specimens: Kinetics Study and Mechanical Integrity

2021 ◽  
Author(s):  
Charles Romain ◽  
Damien Texier ◽  
Clara Desgranges ◽  
Jonathan Cormier ◽  
Stéphane Knittel ◽  
...  
Keyword(s):  
Kinetics Study ◽  
Mechanical Integrity ◽  
Nickel Based Superalloy ◽  
Thin Nickel

scholarly journals Mechanical Integrity Assessment of Two-Side Etched Type Printed Circuit Heat Exchanger with Additional Elliptical Channel

Energies ◽  
2020 ◽  
Vol 13 (18) ◽  
pp. 4711
Author(s):  
Armanto P. Simanjuntak ◽  
Jae-Young Lee
Keyword(s):  
Heat Exchanger ◽  
Stress Intensity ◽  
Maximum Stress ◽  
High Stress ◽  
Element Analysis ◽  
Integrity Assessment ◽  
Printed Circuit ◽  
Mechanical Integrity ◽  
Finite Element Analysis Simulation ◽  
Maximum Stress Intensity

Printed circuit heat exchangers (PCHEs) are often subject to high pressure and temperature difference between the hot and cold channels which may cause a mechanical integrity problem. A conventional plate heat exchanger where the channel geometries are semi-circular and etched at one side of the stacked plate is a common design in the market. However, the sharp edge tip channel may cause high stress intensity. Double-faced type PCHE appears with the promising ability to reduce the stress intensity and stress concentration factor. Finite element analysis simulation has been conducted to observe the mechanical integrity of double-etched printed circuit heat exchanger design. The application of an additional ellipse upper channel helps the stress intensity decrease in the proposed PCHE channel. Five different cases were simulated in this study. The simulation shows that the stress intensity was reduced up to 24% with the increase in additional elliptical channel radius. Besides that, the horizontal offset channels configuration was also investigated in this study. Simulation results show that the maximum stress intensity of 2.5 mm offset configuration is 9% lower compared to the maximum stress intensity of 0 mm offset. This work proposed an additional elliptical upper channel with a 2.5 mm offset configuration as an optimum design.

scholarly journals Mechanical Integrity of PFHE in LNG Liquefaction Process

2012 ◽  
Vol 26 ◽  
pp. 49-55 ◽  
Author(s):  
N.E. Ligterink ◽  
S.V. Hageraats-Ponomareva ◽  
J.F.M. Velthuis
Keyword(s):  
Mechanical Integrity ◽  
Liquefaction Process ◽  
Lng Liquefaction

Fitness for Service Document Comparison: API 579 vs. PDAM

2010 ◽  
Author(s):  
Carl E. Jaske ◽  
Melissa J. Rubal
Keyword(s):  
Damage Mechanisms ◽  
Manufacturing Defects ◽  
Mechanical Integrity ◽  
Weld Defects ◽  
Defect Assessment ◽  
Pipeline Systems ◽  
Process Plants ◽  
Internal Pressures ◽  
Petrochemical Industries ◽  
Available Resources

Assessing the Fitness for Service (FFS) of deficient pipeline segments or facilities is an important step in managing the mechanical integrity and safety of pipeline systems. However, FFS can be determined according to several documents, including API 579-1/ASME FFS-1 2007 Fitness-For-Service (API 579) and the Pipeline Defect Assessment Manual (PDAM). The document contents and assessment methodologies of API 579 and PDAM are reviewed and compared for several common damage mechanisms. API 579 was originally developed for the refining and petrochemical industries but is currently applied to a broad range of equipment and systems. In contrast, PDAM was developed under a joint industry project to assess defects specifically in petrochemical pipelines. While PDAM refers the reader to API 579 for the assessment of several damage mechanisms, including gouges, manufacturing defects, weld defects, and cracks, the authors of PDAM claim that API 579 is generic, biased towards pipes in process plants, and can be overly conservative for the assessment of other pipeline defects. Understanding and comparing the current FFS documents can lead to an enhanced allocation of available resources and can improve the level of FFS assessments in the pipeline industry. The methods used to assess corrosion of components with static internal pressures, dents, dent-gouge combinations, and cracks are compared.

Biochemical changes caused by decellularization may compromise mechanical integrity of tracheal scaffolds

2013 ◽  
Vol 9 (2) ◽  
pp. 5251-5261 ◽  
Author(s):  
L. Partington ◽  
N.J. Mordan ◽  
C. Mason ◽  
J.C. Knowles ◽  
H-W. Kim ◽  
...  
Keyword(s):  
Biochemical Changes ◽  
Mechanical Integrity
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