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.

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.

Mechanical Properties and Microstructures of Al-12Zn-2.4Mg-1.2Cu Alloy Extruded Sheet

2014 ◽  
Vol 893 ◽  
pp. 402-405
Author(s):  
Gang Chen ◽  
Zhi Min Zhang ◽  
Wei Chen
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Electron Microscope ◽  
Yield Strength ◽  
Scanning Electron Microscope ◽  
Optical Microscopy ◽  
Tensile Tests ◽  
Extrusion Temperature ◽  
Two Stage ◽  
Scanning Electron

Mechanical properties of Al-12Zn-2.4Mg-1.2Cu alloy extruded sheet were investigated by tensile tests. Microstructures were investigated by optical microscopy (OM) and scanning electron microscope (SEM). The result shows that no matter in the L direction or in the T direction, the tensile strength and yield strength decrease with the increasing of the extrusion temperature in different states. The tensile strength and yield strength in the L direction are higher than in the T direction at different extrusion temperatures and different treatment states. When temperature is 340°C, the highest tensile strength is 780 MPa and the highest yield strength is 753 MPa in the two-stage solution and two-stage aging state. The reason for the higher mechanical properties are in the L direction in different states is mainly depend on the distribution direction of the grains.

Scale effect investigation of copper microwire's mechanical properties after in situ scanning electron microscope twisting

2018 ◽  
Vol 233 (10) ◽  
pp. 3670-3677
Author(s):  
Fengmei Xue ◽  
Haojian Lu ◽  
Yajing Shen
Keyword(s):  
Mechanical Properties ◽  
Electron Microscope ◽  
Elastic Modulus ◽  
Scanning Electron Microscope ◽  
Strain Hardening Exponent ◽  
Surface Cracks ◽  
Manipulation System ◽  
Fracture Features ◽  
Scanning Electron

In this study, the mechanical property of copper microwire, a widely used material in our daily life, is investigated by subjecting it to in situ scanning electron microscope twisting based on a self-developed nanorobotic manipulation system. First, copper microwire is assembled on the nanorobotic system inside the scanning electron microscope, and then twisted clockwise and anticlockwise continuously from 0° to 360° until fracture. After that, the mechanical properties of elastic modulus, microhardness, yield stress, and the strain hardening exponent of the twisted sample are investigated by nanoindentation. The change in elastic modulus and indention hardness showed strong indentation size effects, because a large number of geometrically necessary dislocations were generated around the indenter. In addition, the fracture analysis indicated that the smaller the scale of the material, the more sensitive it was to surface cracks or defects. Ductile fracture features of the twisted sample appear due to the nucleation, growth, and coalescence of the microvoids.

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

In situ Longitudinal Tensile Tests of Pine Wood in an Environmental Scanning Electron Microscope

Holzforschung ◽  
2002 ◽  
Vol 56 (6) ◽  
pp. 669-675 ◽  
Author(s):  
M. Sippola ◽  
K. Frühmann
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Fracture Process ◽  
Tensile Tests ◽  
Cellular Level ◽  
Environmental Scanning Electron Microscope ◽  
Environmental Scanning ◽  
Gradual Change ◽  
Scanning Electron

Summary To study wood fracture on its cellular level, small tensile specimens of pine (Pinus sylvestris [L.]) were fractured in situ in tension inside the chamber of an ESEM (Environmental Scanning Electron Microscope). Fractured surfaces of macroscopic tensile test specimens were also studied with an ESEM. The same kind of fracture phenomena were observed in both small and large specimens. The in situ tests proved to be reproducible and the results revealed typical fracture propagation0 directions and order in softwood under longitudinal tension. The gradual change of material properties of wood in the radial direction was found to strongly influence the fracture process.

scholarly journals The Effect Of Strain Rate On The Mechanical Properties And Microstructure Of The High-Mn Steel After Dynamic Deformation Tests

2015 ◽  
Vol 60 (2) ◽  
pp. 577-580 ◽  
Author(s):  
M.B. Jabłońska ◽  
A. Śmiglewicz ◽  
G. Niewielski
Keyword(s):  
Mechanical Properties ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Dynamic Deformation ◽  
Hardness Test ◽  
Tensile Tests ◽  
Mechanical Twinning ◽  
Test Method ◽  
Static Tensile ◽  
Scanning Electron

AbstractThe paper presents results of dynamic tensile investigations of high-manganese Fe – 20 wt.% Mn – 3 wt.% Al – 3 wt.% Si – 0.2 wt.% steel. The research was carried out on a flywheel machine, which enables to perform dynamic tensile tests and impact bending with a linear velocity of the enforcing element in the range of 5÷40 m/s. It was found that the studied steel was characterized by very good mechanical properties. Strength of the tested materials was determined in the static tensile test and dynamic deformation test, while its hardness was measured with the Vickers hardness test method. The surface of fractures that were created in the areas where the sample was torn were analyzed. These fractures indicate the presence of transcrystalline ductile fractures. Fractographic tests were performed with the use of a scanning electron microscope. The structure was analyzed by light optical microscopy. Substructure studies revealed occurrence of mechanical twinning induced by high strain rates. A detailed analysis of the structure was performed with the use of a transmission scanning electron microscope STEM.

Sign in / Sign up

Export Citation Format

Share Document