Quantitative surface bending strain analysis of flexible films by surface labeled grating method

2021 ◽  
Author(s):  
Atsushi Shishido
Keyword(s):  
Strain Analysis ◽  
Flexible Films ◽  
Bending Strain

Bending strain analysis considering a shift of the neutral axis for YBCO coated conductors with and without a Cu stabilizing layer

2011 ◽  
Vol 24 (7) ◽  
pp. 075019 ◽  
Author(s):  
Michinaka Sugano ◽  
Shutaro Machiya ◽  
Masugu Sato ◽  
Tomoyuki Koganezawa ◽  
Koji Shikimachi ◽  
...  
Keyword(s):  
Strain Analysis ◽  
Neutral Axis ◽  
Coated Conductors ◽  
Bending Strain ◽  
Ybco Coated Conductors

Norman Wells pipeline settlement and uplift movements

1999 ◽  
Vol 36 (1) ◽  
pp. 119-135 ◽  
Author(s):  
JF (Derick) Nixon ◽  
Margo Burgess
Keyword(s):  
Structural Model ◽  
Strain Analysis ◽  
Frost Heave ◽  
Low Density ◽  
Oil Pipeline ◽  
The North ◽  
Bending Strain ◽  
Uplift Zone ◽  
Thaw Depth ◽  
Thaw Settlement

The Norman Wells oil pipeline has been operating successfully since 1985. The pipe was designed to operate as an ambient-temperature pipeline and accommodate up to 0.8 m of thaw settlement in inorganic terrain. The pipeline has settled close to this amount in some areas, without excessive straining of the pipe. An average thaw strain for the soil back-calculated from the thaw depth and resulting thaw settlement at several sites gives average values of 16-20%. At one location (kilometre post 5.2), the pipeline has experienced uplift of 1.1 m or more. The mechanism for pipe movement is likely a combination of high axial stresses and some small initial frost heave, which triggered uplift buckling of the pipe. Low-density thawed soils contributed to this behavior. An internal profiling device (Geopig) has been run through the pipe in recent years. Analysis of the profiles indicates excellent agreement with manual surveys at the site. The pipe is experiencing about 0.3% bending strain in the uplift zone, and about 0.4% strain in a settling area immediately to the north. Pipe strain analysis using a structural model indicates that about 0.2 m of frost heave would be required to initiate uplift buckling over a critical heave length of 22-25 m.

scholarly journals Stretchable and Flexible Thin Films Based on Expanded Graphite Particles

Processes ◽  
2020 ◽  
Vol 8 (8) ◽  
pp. 961
Author(s):  
Malik Muhammad Nauman ◽  
Murtuza Mehdi ◽  
Dawood Husain ◽  
Juliana Haji Zaini ◽  
Muhammad Saifullah Abu Bakar ◽  
...  
Keyword(s):  
Thin Films ◽  
Flexible Electronics ◽  
Expanded Graphite ◽  
Substrate Material ◽  
Ultrasonic Frequency ◽  
Graphite Particles ◽  
Flexible Films ◽  
Bending Strain ◽  
Xrd Patterns ◽  
Flexible Graphite

Stretchable and flexible graphite films can be effectively applied as functional layers in the progressively increasing field of stretchable and flexible electronics. In this paper, we focus on the feasibility of making stretchable and flexible films based on expanded graphite particles on a polymeric substrate material, polydimethylsiloxane (PDMS). The expanded graphite particles used in this work are prepared by utilizing bath sonication processes at the ultrasonic frequency of either the commercially available graphite flakes or graphite particles obtained through electrolysis under the interstitial substitution of silver and sulfate, respectively. The X-ray diffraction (XRD) patterns confirm that, due to the action of the bath sonication intercalation of graphite taking place, the resistances of the as-fabricated thin films is ultimately lowered. Mechanical characterizations, such as stretchability, flexibility and reliability tests were performed using home-made tools. The films were found to remain stretchable up to 40% tensile strain and 20% bending strain. These films were also found to remain functional when repeatedly flexed up to 1000 times.

Measurement of stress/strain in single-crystal samples using diffraction

2006 ◽  
Vol 39 (3) ◽  
pp. 320-325 ◽  
Author(s):  
Hanfei Yan ◽  
I. C. Noyan
Keyword(s):  
Single Crystal ◽  
Strain Analysis ◽  
Incident Beam ◽  
Diffraction Theory ◽  
Secondary Peak ◽  
Bending Strain ◽  
Integrated Intensity ◽  
Cantilever Bending ◽  
Incident Beam Energy ◽  
Tip Displacement

Diffraction profiles from an Si-single-crystal strip deformed in cantilever bending are presented as a function of tip displacement and incident-beam energy. Data obtained with slit-based diffracted-beam optics contain a secondary peak in addition to the primary 004 reflection for all energies when the bending strain is finite. This secondary peak can be identified as a `mirage' peak, predicted by dynamical diffraction theory to occur in weakly deformed single-crystal samples. The integrated intensity of this mirage peak increases with increasing energy and tip displacement and exceeds the primary peak intensity at higher values. The mirage peak disappears when a monochromator is used in the diffracted-beam path. Data that show the effect of these mirage peaks on X-ray diffraction strain analysis are presented, and it is shown that a diffracted-beam monochromator may be used to eliminate these errors.

Transport E–J characteristics in Bi-2223 tape under the influence of bending strain: analysis by use of the percolation model

2001 ◽  
Vol 357-360 ◽  
pp. 1123-1127 ◽  
Author(s):  
T. Kiss ◽  
K. Oda ◽  
S. Nishimura ◽  
M. Inoue ◽  
M. Kiuchi ◽  
...  
Keyword(s):  
Strain Analysis ◽  
Percolation Model ◽  
Bending Strain

Strain analysis in composite ceramics

1986 ◽  
Vol 44 ◽  
pp. 494-497
Author(s):  
W. M. Kriven
Keyword(s):  
Strain Field ◽  
Strain Analysis ◽  
Processing Temperature ◽  
Transformation Toughening ◽  
Zirconia Ceramics ◽  
Volume Increase ◽  
Analysis Technique ◽  
Fundamental Understanding ◽  
Contrast Analysis ◽  
Elastic Strain Field

Significant progress towards a fundamental understanding of transformation toughening in composite zirconia ceramics was made possible by the application of a TEM contrast analysis technique for imaging elastic strains. Spherical zirconia particles dispersed in a large-grained alumina matrix were examined by 1 MeV HVEM to simulate bulk conditions. A thermal contraction mismatch arose on cooling from the processing temperature of 1500°C to RT. Tetragonal ZrO2 contracted amisotropically with α(ct) = 16 X 10-6/°C and α(at) = 11 X 10-6/°C and faster than Al2O3 which contracted relatively isotropically at α = 8 X 10-6/°C. A volume increase of +4.9% accompanied the transformation to monoclinic symmetry at room temperature. The elastic strain field surrounding a particle before transformation was 3-dimensionally correlated with the internal crystallographic orientation of the particle and with the strain field after transformation. The aim of this paper is to theoretically and experimentally describe this technique using the ZrO2 as an example and thereby to illustrate the experimental requirements Tor such an analysis in other systems.

Strain analysis with nanometer resolution using a conventional transmission electron microsopy technique: electron diffraction contrast imaging revisited

1995 ◽  
Vol 53 ◽  
pp. 168-169
Author(s):  
Koenraad G F Janssens ◽  
Omer Van der Biest ◽  
Jan Vanhellemont ◽  
Herman E Maes ◽  
Robert Hull
Keyword(s):  
Electron Diffraction ◽  
Strain Field ◽  
Elastic Strain ◽  
Strain Analysis ◽  
Local Strain ◽  
Contrast Imaging ◽  
Strain Characterization ◽  
Physical Mechanisms ◽  
Diffraction Contrast ◽  
Transmission Electron

There is a growing need for elastic strain characterization techniques with submicrometer resolution in several engineering technologies. In advanced material science and engineering the quantitative knowledge of elastic strain, e.g. at small particles or fibers in reinforced composite materials, can lead to a better understanding of the underlying physical mechanisms and thus to an optimization of material production processes. In advanced semiconductor processing and technology, the current size of micro-electronic devices requires an increasing effort in the analysis and characterization of localized strain. More than 30 years have passed since electron diffraction contrast imaging (EDCI) was used for the first time to analyse the local strain field in and around small coherent precipitates1. In later stages the same technique was used to identify straight dislocations by simulating the EDCI contrast resulting from the strain field of a dislocation and comparing it with experimental observations. Since then the technique was developed further by a small number of researchers, most of whom programmed their own dedicated algorithms to solve the problem of EDCI image simulation for the particular problem they were studying at the time.

Modulation of carotid strain by statin therapy in atherosclerosis patients

VASA ◽  
2017 ◽  
Vol 46 (2) ◽  
pp. 108-115 ◽  
Author(s):  
Christian Alexander Schaefer ◽  
Anna Katharina Blatzheim ◽  
Sebastian Gorgonius Passon ◽  
Kristin Solveig Pausewang ◽  
Nadjib Schahab ◽  
...  
Keyword(s):  
Statin Therapy ◽  
Pulse Wave ◽  
Ultrasound Examination ◽  
Ankle Brachial Index ◽  
Radial Strain ◽  
Strain Analysis ◽  
Duplex Ultrasound ◽  
Strain Imaging ◽  
The Common

Abstract. Background: The beneficial effect of statin therapy on the progress of atherosclerotic disease has been demonstrated by numerous studies. Vascular strain imaging is an arising method to evaluate arterial stiffness. Our study examined whether an influence of statin therapy on the vessel wall could be detected by vascular strain imaging. Patients and methods: 88 patients with recently detected atherosclerosis underwent an angiological examination including ankle-brachial index (ABI), pulse wave index (PWI), central puls ewave velocity and duplex ultrasound. Captures for vascular strain analysis were taken in B-mode during ultrasound examination of the common carotid artery and evaluated using a workstation equipped with a speckle tracking based software. A statin therapy was recommended and after six months a follow-up examination took place. Meanwhile, the non-adherence of a group of patients (N = 18) lead to a possibility to observe statin effects on the vascular strain. Results: In the statin non-adherent group the ABI decreased significantly to a still non-pathological level (1.2 ± 0.2 vs. 1.0 ± 0.2; p = 0.016) whereas it stagnated in the adherent group (1.0 ± 0.2 vs. 1.0 ± 0.2; p = 0.383). The PWI did not differ in the non-adherent group (180.5 ± 71.9 vs. 164.4 ± 75.8; p = 0.436) but under statin therapy it decreased significantly (261.8 ± 238.6 vs. 196.4 ± 137.4; p = 0.016). In comparison to the adherent group (4.2 ± 2.0 vs. 4.0 ± 1.8; p = 0.548) under statin therapy the radial strain decreased significantly in the non-adherent group (4.7 ± 2.0 vs. 3.3 ± 1.1; p = 0.014). Conclusions: Our findings reveal a beneficial influence of statin therapy on the arterial wall detected by vascular strain analysis.

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