Nanoscale Mechanical Properties – Measuring Techniques and Applications

2007 ◽  
pp. 1107-1136
Author(s):  
Andrzej Kulik ◽  
Andras Kis ◽  
Gérard Gremaud ◽  
Stefan Hengsberger ◽  
Gustavo Luengo ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Measuring Techniques

scholarly journals Fundamental Frequencies of Vibration of Footbridges in Portugal: FromIn SituMeasurements to Numerical Modelling

2014 ◽  
Vol 2014 ◽  
pp. 1-22 ◽  
Author(s):  
C. S. Oliveira
Keyword(s):  
Mechanical Properties ◽  
Dynamic Characteristics ◽  
Numerical Models ◽  
Great Accuracy ◽  
Negative Power ◽  
Fundamental Frequencies ◽  
Simple Geometry ◽  
Measuring Techniques ◽  
Different Types

Since 1995, we have been measuring thein situdynamic characteristics of different types of footbridges built in Portugal (essentially steel and precast reinforced concrete decks) with single spans running from 11 to 110 m long, using expedite exciting and measuring techniques. A database has been created, containing not only the fundamental dynamic characteristics of those structures (transversal, longitudinal, and vertical frequencies) but also their most important geometric and mechanical properties. This database, with 79 structures organized into 5 main typologies, allows the setting of correlations of fundamental frequencies as a negative power function of span lengthsL  (L-0.6toL-1.4). For 63 footbridges of more simple geometry, it was possible to obtain these correlations by typology. A few illustrative cases representing the most common typologies show that linear numerical models can reproduce thein situmeasurements with great accuracy, not only matching the frequencies of vibration but also the amplitudes of motion caused by several pedestrian load patterns.

Nanoscale Mechanical Properties — Measuring Techniques and Applications

2006 ◽  
pp. 535-573
Author(s):  
Andrzej J. Kulik ◽  
András Kis ◽  
Gérard Gremaud ◽  
Stefan Hengsberger ◽  
Philippe K. Zysset ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Measuring Techniques

scholarly journals Metrological provision of measurement using NanoScan-3D microscopenanothercomer

2021 ◽  
Author(s):  
Viktor Denysiuk ◽  
Volodymyr Symonyuk ◽  
Yurii Lapchenko ◽  
Anton Tymoshchuk ◽  
Sofiia Cherniak
Keyword(s):  
Mechanical Properties ◽  
Scanning Probe Microscopy ◽  
Metrological Provision ◽  
Abrasion Resistance ◽  
Surface Relief ◽  
Scanning Probe ◽  
Main Element ◽  
Original Design ◽  
Thin Coatings ◽  
Measuring Techniques

A review of methods and instrumentation for the study of tribological and mechanical properties of the surface. It is established that the most common methods for studying these properties in the micro and nano-ranges are contact methods based on the interaction of the hard tip with the material under study. In scanning probe microscopy, a bimorph piezoceramic probe with a diamond tip is the main element of the measurement modules used for nanoindentation and sclerometry to comprehensively study the tribological and mechanical properties of the surface. The original design of the sensor allows to implement more than ten measuring techniques on one device. The operation of these devices in the semi-contact scanning probe-microscopic mode allows to obtain images of the surface relief and a map of the distribution of elastic properties. The indentation mode allows to measure hardness and modulus of elasticity, to estimate elastic recovery of material after indentation. The method allows to determine the abrasion resistance and hardness of the material, adhesion and thickness of thin coatings.

Nanoscale Mechanical Properties — Measuring Techniques and Applications

2004 ◽  
pp. 661-685
Author(s):  
Andrzej J. Kulik ◽  
András Kis ◽  
Gérard Gremaud ◽  
Stefan Hengsberger ◽  
Philippe K. Zysset ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Measuring Techniques

Peripheral Nerve Strain: A Comparison of Strain Measuring Techniques

2008 ◽  
Author(s):  
Joshua E. Johnson ◽  
Kenneth J. Fischer ◽  
Terence E. McIff
Keyword(s):  
Mechanical Properties ◽  
Nervous System ◽  
Connective Tissue ◽  
Nerve Fibers ◽  
Main Function ◽  
Control Center ◽  
Communications Network ◽  
Physiological Properties ◽  
Measuring Techniques ◽  
And Function

The main function of the nervous system is to serve the body’s control center and communications network. Each nerve consists of various elements that possess distinct anatomic and physiological properties which allow them to perform their intended roles and function as a unit. Studies have shown the endoneurium, perineurium and epineurium, comprising the successive layers of intraneural connective tissue surrounding nerve fibers, to exhibit different properties [1, 2]. It is therefore important to take this into consideration when investigating mechanical properties of nerves.

Nanoscale Mechanical Properties – Measuring Techniques and Applications

2004 ◽  
pp. 661-685
Author(s):  
Andrzej J. Kulik ◽  
András Kis ◽  
Gérard Gremaud ◽  
Stefan Hengsberger ◽  
Philippe K. Zysset ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Measuring Techniques

Phase Transformations in Ti-7w/oMo-3w/oMe Alloy

1974 ◽  
Vol 32 ◽  
pp. 514-515
Author(s):  
S. Fujishiro
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Transmission Electron Microscopy ◽  
Tensile Strength ◽  
Mechanical Processing ◽  
Ray Method ◽  
X Ray ◽  
Transmission Electron ◽  
Water Quench ◽  
Alpha Beta

The mechanical properties of three titanium alloys (Ti-7Mo-3Al, Ti-7Mo- 3Cu and Ti-7Mo-3Ta) were evaluated as function of: 1) Solutionizing in the beta field and aging, 2) Thermal Mechanical Processing in the beta field and aging, 3) Solutionizing in the alpha + beta field and aging. The samples were isothermally aged in the temperature range 300° to 700*C for 4 to 24 hours, followed by a water quench. Transmission electron microscopy and X-ray method were used to identify the phase formed. All three alloys solutionized at 1050°C (beta field) transformed to martensitic alpha (alpha prime) upon being water quenched. Despite this heavily strained alpha prime, which is characterized by microtwins the tensile strength of the as-quenched alloys is relatively low and the elongation is as high as 30%.

Effects of cooling rate on the mechanical properties of dual phase treated vanadium steels

1983 ◽  
Vol 41 ◽  
pp. 220-221
Author(s):  
L.J. Chen ◽  
H.C. Cheng ◽  
J.R. Gong ◽  
J.G. Yang
Keyword(s):  
Mechanical Properties ◽  
Cooling Rate ◽  
Automobile Industry ◽  
High Strength ◽  
Weight Percent ◽  
Low Alloy Steels ◽  
Dual Phase ◽  
Resource Requirement ◽  
Alloy Steels ◽  
Potential Weight

For fuel savings as well as energy and resource requirement, high strength low alloy steels (HSLA) are of particular interest to automobile industry because of the potential weight reduction which can be achieved by using thinner section of these steels to carry the same load and thus to improve the fuel mileage. Dual phase treatment has been utilized to obtain superior strength and ductility combinations compared to the HSLA of identical composition. Recently, cooling rate following heat treatment was found to be important to the tensile properties of the dual phase steels. In this paper, we report the results of the investigation of cooling rate on the microstructures and mechanical properties of several vanadium HSLA steels.The steels with composition (in weight percent) listed below were supplied by China Steel Corporation: 1. low V steel (0.11C, 0.65Si, 1.63Mn, 0.015P, 0.008S, 0.084Aℓ, 0.004V), 2. 0.059V steel (0.13C, 0.62S1, 1.59Mn, 0.012P, 0.008S, 0.065Aℓ, 0.059V), 3. 0.10V steel (0.11C, 0.58Si, 1.58Mn, 0.017P, 0.008S, 0.068Aℓ, 0.10V).

Lattice Imaging of Grain Boundaries in Ceramics

1977 ◽  
Vol 35 ◽  
pp. 114-115
Author(s):  
D. R. Clarke ◽  
G. Thomas
Keyword(s):  
Mechanical Properties ◽  
High Temperature ◽  
Silicon Nitride ◽  
Grain Boundaries ◽  
High Temperature Strength ◽  
Current Interest ◽  
Lattice Imaging ◽  
Special Significance ◽  
Structural Applications ◽  
Refractory Ceramics

Grain boundaries have long held a special significance to ceramicists. In part, this has been because it has been impossible until now to actually observe the boundaries themselves. Just as important, however, is the fact that the grain boundaries and their environs have a determing influence on both the mechanisms by which powder compaction occurs during fabrication, and on the overall mechanical properties of the material. One area where the grain boundary plays a particularly important role is in the high temperature strength of hot-pressed ceramics. This is a subject of current interest as extensive efforts are being made to develop ceramics, such as silicon nitride alloys, for high temperature structural applications. In this presentation we describe how the techniques of lattice fringe imaging have made it possible to study the grain boundaries in a number of refractory ceramics, and illustrate some of the findings.

Electron Microscopic Observation of the Longitudinal Organization of Poly (p-Phenylene Terephthalamide) Fibers

1982 ◽  
Vol 40 ◽  
pp. 680-681
Author(s):  
Li Li-Sheng ◽  
L.F. Allard ◽  
W.C. Bigelow
Keyword(s):  
Electron Microscopy ◽  
Mechanical Properties ◽  
Scanning Electron Microscopy ◽  
Microscopic Observation ◽  
Electron Microscopic Observation ◽  
Electron Microscopic ◽  
Aromatic Polyamides ◽  
Radial Arrangement ◽  
Scanning Electron ◽  
Better Than

The aromatic polyamides form a class of fibers having mechanical properties which are much better than those of aliphatic polyamides. Currently, the accepted morphology of these fibers as proposed by M.G. Dobb, et al. is a radial arrangement of pleated sheets, with the plane of the pleats parallel to the axis of the fiber. We have recently obtained evidence which supports a different morphology of this type of fiber, using ultramicrotomy and ion-thinning techniques to prepare specimens for transmission and scanning electron microscopy.

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