Flux-pinning-induced stress and strain in superconductors: Case of a long circular cylinder

1999 ◽  
Vol 60 (13) ◽  
pp. 9690-9703 ◽  
Author(s):  
Tom H. Johansen
Keyword(s):  
Circular Cylinder ◽  
Flux Pinning ◽  
Stress And Strain ◽  
Induced Stress

A Method for the Verification of Subsea Equipment Subject to Hydrogen Induced Stress Cracking

2010 ◽  
Author(s):  
Michelangelo Fabbrizzi ◽  
Paolo Di Sisto ◽  
Roberto Merlo
Keyword(s):  
Oil And Gas ◽  
Production Systems ◽  
Local Stress ◽  
Gas Production ◽  
Stress And Strain ◽  
3D Analysis ◽  
Oil And Gas Production ◽  
Safety Issues ◽  
Stress Cracking ◽  
Induced Stress

Subsea oil and gas production systems can be subject to Hydrogen Induced Stress Cracking (“HISC”) depending on the material, cathodic protection and other factors. A failure in this kind of systems can lead to safety issues as well as environmental hazards and high repair costs. The analysis of recent failures has led to the recognition of HISC as a very important issue related to local stress and strain. This has necessitated the extensive use of Finite Elements Methods for the analysis of all system components. Since HISC is a recent issue, there are very few cases of such assessments reported in the literature. This paper is based on the assessment of the susceptibility of subsea piping manifolds of Duplex stainless steel to Hydrogen Induced Stress Cracking, which was conducted during the Skarv project by General Electric Oil & Gas. A variety of cases consisting of different loads and configurations were considered to give a broad assessment using a recently developed code (DNV-RP-F112-October2008). This work has led to the development of a set of procedures and models for the assessment of the entire system which is described in the current paper. The proposed methodology is useful for both design purposes and also for the verification of parts, which, if found to be non-compliant, would require redesign. In general, parts that were determined to be non-compliant using a linear assessment were found to be compliant through non-linear analysis, in fact 3D plastic analysis leads to a redistribution of stress and strain and hence, to lower values. “Cold creep” was not considered since the levels of stress and strain were considered to be low enough to avoid this phenomenon. As a consequence of this experience, a new methodology was developed, which is able to speed up the analysis process and to predict local stresses from only pipe elements. The latter permits the use of a linear assessment for bends, T junctions and weldolet even with misalignment and erosion, avoiding the need to perform 3D analysis. The second part of the paper describes this method.

scholarly journals Kim model for flux-pinning-induced stress in a long cylindrical superconductor

AIP Advances ◽  
2016 ◽  
Vol 6 (7) ◽  
pp. 075305 ◽  
Author(s):  
Jun Zeng ◽  
Xiaogui Wang ◽  
Huaping Wu ◽  
Feng Xue ◽  
Jun Zhu
Keyword(s):  
Flux Pinning ◽  
Induced Stress ◽  
Kim Model

Stretch-Induced Stress Fiber Remodeling and MAPK Activations Depend on Mechanical Strain Rate

2011 ◽  
Author(s):  
Hui-Ju Hsu ◽  
Andrea Locke ◽  
Susan Q. Vanderzyl ◽  
Roland Kaunas
Keyword(s):  
Cell Function ◽  
Myosin Ii ◽  
Mechanical Strain ◽  
Optimal Level ◽  
Stress Fiber ◽  
Stress And Strain ◽  
Structural Elements ◽  
Cell Matrix ◽  
Induced Stress ◽  
The Matrix

Actin stress fibers (SFs), bundles of actin filaments crosslinked by α-actinin and myosin II in non-muscle cells, are mechanosensitive structural elements that respond to applied stress and strain to regulate cell morphology, signal transduction and cell function. Results from various studies indicate that myosin-generated contraction extends SFs beyond their unloaded lengths and cells maintain fiber strain at an optimal level that depends on actomyosin activity (Lu et al., 2008). Stretching the matrix upon which cells adhere perturbs the cell-matrix traction forces and cells respond by actively re-establishing the preexisting level of force (Brown et al., 1998; Gavara et al., 2008). We have developed a sarcomeric model of SF networks (Kaunas et al., 2011) to predict the effects of stretch on SF reorganization depending on the rates of matrix stretching, SF turnover, and SF stress relaxation.

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