Micromechanical Tensile Testing

1996 ◽  
Vol 436 ◽  
Author(s):  
S. Greek ◽  
F. Ericson ◽  
S. Johansson ◽  
J.-Å. Schweitz
Keyword(s):  
Fracture Strength ◽  
Tensile Testing ◽  
Weibull Modulus ◽  
Tensile Tests ◽  
Cross Sectional ◽  
Weibull Statistics ◽  
Electrodeposited Nickel ◽  
The Mean ◽  
Scanning Electron

AbstractA method is described where tensile tests can be performed in situ on micromachined structures. The testing equipment consists of a testing unit mounted on a micromanipulator in a Scanning Electron Microscope (SEM). The fracture loads of micromachined beam structures made from thick and thin film polysilicon as well as from electrodeposited nickel and nickeliron alloy were measured, and the fracture strengths then calculated via measurements of the test structures’ initial cross-sectional areas. The statistical scatter of the polysilicon fracture strength values were evaluated by Weibull statistics. The mean fracture strength and the Weibull modulus, a measure of the scatter, were obtained

scholarly journals Unveiling the thickness-dependent mechanical properties of graphene papers by in situ SEM tension

RSC Advances ◽  
2019 ◽  
Vol 9 (8) ◽  
pp. 4609-4615
Author(s):  
Tianci Cao ◽  
Xianqiang Liu ◽  
Xiaopeng Cheng ◽  
Yonghe Li ◽  
Lijun Sang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Fracture Strength ◽  
Tensile Tests ◽  
Graphene Sheets ◽  
Graphene Paper ◽  
Different Thickness ◽  
Scanning Electron

We prepared graphene paper (GP) using graphene sheets of different thickness. The fracture strength of the GP was assessed by uniaxial in-plane tensile tests using an in situ scanning electron microscope.

scholarly journals Mechanical Properties of Sigma 1140+ Sic Fibres Prior and after Composite Processing

2000 ◽  
Vol 9 (4) ◽  
pp. 096369350000900 ◽  
Author(s):  
C. Gonzalez ◽  
J. Llorca
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Electron Microscope ◽  
Elastic Modulus ◽  
Weibull Modulus ◽  
Fibre Diameter ◽  
Tensile Tests ◽  
Fibre Strength ◽  
Composite Processing ◽  
Scanning Electron

The effect of processing on the mechanical properties of Sigma 1140+ SiC fibres was studied through tensile tests carried out on pristine Sigma 1140+ SiC fibres and on fibres extracted from a Ti-6A1-4V-matrix composite. The elastic modulus and the tensile strength were computed after measuring carefully the fibre diameter. The characteristic fibre strength was reduced by 20% and the Weibull modulus by half during composite processing. The analysis of the fracture surfaces in the scanning electron microscope showed that the strength-limiting defects were located around the tungsten core in pristine fibres and predominantly at the surface in fibres extracted from the composite panels. These latter defects were nucleated by the mechanical stresses generated on the fibres during the panel consolidation.

In Situ Template Synthesis of TiO2 Nanotube Array Films

2007 ◽  
Vol 336-338 ◽  
pp. 2200-2202 ◽  
Author(s):  
Wu Feng Jiang ◽  
Yun Han Ling ◽  
Su Ju Hao ◽  
Hong Yi Li ◽  
Xin De Bai ◽  
...  
Keyword(s):  
Anodic Aluminum Oxide ◽  
Treatment Condition ◽  
Liquid Phase Deposition ◽  
X Ray Diffraction ◽  
Nanotube Array ◽  
X Ray ◽  
Anodic Aluminum ◽  
The Mean ◽  
Scanning Electron

Anodic aluminum oxide (AAO) is commonly used as a starting template for fabrication of several kinds of functional nanoscale devices due to its homogeneous nanohole structure with high aspect ratio. In this paper, high density and uniform titanium dioxide nanotube array films were prepared via liquid phase deposition method by immersing the AAO templates in an aqueous ammonium hexafluorotitanate solution. The phase and microstructure of the nanotube array films were characterized by X-ray diffraction and field-emission scanning electron microscopy. It was found that the mean inner diameters of nanotube are 40-100 nm, mainly depended on different templates and post treatment condition; the phase of as-deposited TiO2 array film was amorphous, while it became anatase at above 400°C.

scholarly journals In Situ and Post-Mortem Characterizations of Ultrasonic Spot Welded AZ31B and Coated Dual Phase 590 Steel Joints

Metals ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 899 ◽  
Author(s):  
Jian Chen ◽  
Yong Chae Lim ◽  
Donovan Leonard ◽  
Hui Huang ◽  
Zhili Feng ◽  
...  
Keyword(s):  
High Speed ◽  
Tensile Tests ◽  
Fatigue Tests ◽  
Image Correlation ◽  
Joint Interface ◽  
Welding Time ◽  
Cross Sectional ◽  
Welding Condition ◽  
Lap Shear

Ultrasonic spot welding using different welding conditions was applied to join dissimilar metals of galvanized DP590 steel and AZ31B magnesium sheets. In situ high-speed imaging, digital image correlation, and infrared thermography were utilized to quantitatively study the interfacial relative motion, surface indentation, and heat generation across the joint faying interface and the sheet/sonotrode interfaces under the welding condition of moderate welding power and short welding time. For welds made with high power and long welding time, lap shear tensile tests as well as fatigue tests were carried out. Different fracture modes were observed after the lap shear tensile tests and fatigue tests performed under different peak loads. Post-weld cross-sectional analysis with scanning electron microscopy coupled with energy dispersive X-Ray spectroscopy revealed the variation of morphology and chemical composition at the joint interface for welds made with different welding conditions.

In-situ tensile testing of single-crystal molybdenum-alloy fibers with various dislocation densities in a scanning electron microscope

2011 ◽  
Vol 27 (3) ◽  
pp. 508-520 ◽  
Author(s):  
Kurt E. Johanns ◽  
Andreas Sedlmayr ◽  
P. Sudharshan Phani ◽  
Reiner Mönig ◽  
Oliver Kraft ◽  
...  
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Single Crystal ◽  
Tensile Testing ◽  
Molybdenum Alloy ◽  
Dislocation Densities ◽  
Image Position ◽  
Scanning Electron ◽  
In Situ Tensile Testing

Abstract

Effect of Sidewall Fluorination on the Mechanical Properties of Catalytically Grown Multi-Wall Carbon Nanotubes

2011 ◽  
Vol 1284 ◽  
Author(s):  
Yogeeswaran Ganesan ◽  
Cheng Peng ◽  
Lijie Ci ◽  
Valery Khabashesku ◽  
Pulickel M. Ajayan ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Tensile Strength ◽  
Electron Microscope ◽  
Tensile Testing ◽  
Load Bearing Capacity ◽  
Multi Wall Carbon Nanotubes ◽  
Pristine Mwnts ◽  
Scanning Electron

ABSTRACTWe report on the usage of a simple microfabricateddevice, that works in conjunction with a quantitative nanoindenter inside a scanning electron microscope (SEM), for the in situ quantitative tensile testing of individual sidewall fluorinated multi-wall carbon nanotubes (MWNTs). The stress vs. strain curves and the tensile strength values for five fluorinated specimens have been presented and compared to those of pristine MWNT specimens (data reported earlier). The fluorinated specimens were found to deform and fail in a brittle fashion similar to pristine MWNTs. However, sidewall fluorination was found to have considerably degraded the mechanical properties (tensile strength and load bearing capacity) of the MWNTs.

Detection of the Fracture Path under Tensile Loads through in situ Tests in an ESEM Chamber

Holzforschung ◽  
2003 ◽  
Vol 57 (3) ◽  
pp. 326-332 ◽  
Author(s):  
K. Frühmann ◽  
I. Burgert ◽  
S. E. Stanzl-Tschegg
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Tensile Tests ◽  
Specimen Size ◽  
Environmental Scanning ◽  
Fracture Path ◽  
Cooling Device ◽  
In Situ Tests ◽  
Scanning Electron

Summary In situ tensile tests parallel to the grain were carried out in an Environmental Scanning Electron Microscope (ESEM) chamber on Norway spruce (Picea abies [L.] Karst.) samples. The ESEM-mode combined with a cooling device allowed examination of the specimens at a moisture content of 12% with unsputtered surfaces. By recording load-displacement curves and observing crack propagation simultaneously, a detailed image of fracture progress and tissue interaction could be described. Since these experiments required a sufficient specimen size and geometry, focus was concentrated on the methodology.

In situ tensile tests of single silk fibres in an environmental scanning electron microscope (ESEM)

2013 ◽  
Vol 48 (14) ◽  
pp. 5055-5062 ◽  
Author(s):  
Beth Mortimer ◽  
Daniel R. Drodge ◽  
Kalin I. Dragnevski ◽  
Clive R. Siviour ◽  
Chris Holland
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Tensile Tests ◽  
Environmental Scanning Electron Microscope ◽  
Environmental Scanning ◽  
Scanning Electron

SEM Imaging of In Situ Tensile Testing of 27CrNiMoV Steel

2020 ◽  
Vol 405 ◽  
pp. 60-65
Author(s):  
Martin Bystrianský ◽  
Ludmila Kučerová ◽  
Zbyněk Bunda
Keyword(s):  
Tensile Testing ◽  
Tensile Load ◽  
Strain Curve ◽  
Tensile Tests ◽  
Gauge Length ◽  
Whole Body ◽  
Initial State ◽  
Dog Bone ◽  
Gauge Section

In-situ tensile testing of a 27CrNiMoV alloy which is used for steam turbine rotors was carried out using scanning electron microscope (SEM). Deformation and crack formation and propagation were examined with this test. Small (45 × 10 × 1.5 mm, with gauge length of 20 mm), flat samples based on dog-bone shape were prepared from the steel. The material in its initial state contained high number of defects in form of microcracks. A comparison of behaviour at tensile tests of samples without visible defect and with crack in the gauge section was performed. Apparently, the presence of defect in the initial state showed direct influence on properties like lower tensile strength. The sample, its necking and propagated crack is displayed at different stages of the tensile load. In-situ testing reveals differences in the sample deformation. The defect-free sample is affected in its whole body and regular necking can be observed, whereas the presence of the crack in the defect samples concentrates stress to a smaller area and also changed the shape of the stress-strain curve.

Sign in / Sign up

Export Citation Format

Share Document