Prediction on nonlinear mechanical performance of random particulate composites by a statistical second-order reduced multiscale approach

2021 ◽  
Author(s):  
Zhiqiang Yang ◽  
Yi Sun ◽  
Yizhi Liu ◽  
Junzhi Cui
Keyword(s):  
Mechanical Performance ◽  
Second Order ◽  
Particulate Composites ◽  
Multiscale Approach ◽  
Nonlinear Mechanical

scholarly journals Compressive mechanical behavior and model of composite elastic-porous metal materials

2021 ◽  
Author(s):  
Pei Yang ◽  
Tao Zhou ◽  
Di Jia ◽  
Zhiqiang Qin ◽  
Yiwan Wu ◽  
...  
Keyword(s):  
Theoretical Model ◽  
Mechanical Performance ◽  
Porous Metal ◽  
Wire Mesh ◽  
Experimental Characterization ◽  
Damping Material ◽  
Nonlinear Mechanical ◽  
Mass Ratios ◽  
Metal Materials ◽  
First Time

Abstract This work presents the experimental characterization and theoretical modeling of composite elastic-porous metal materials (C-EPMM). C-EPMM is a novel porous metallic damping material made of wire mesh and wire helix. A series of quasi-static compressive experiments were carried out to investigate the stiffness and energy absorption ability of the C-EPMM with different mass ratios. The experimental results show that the mass ratios can significantly affect the stiffness and loss factor of C-EPMM. To efficiently predict the nonlinear mechanical properties of the C-EPMM a theoretical model of C-EPMM was proposed for the first time, the model was based on the manufacturing process. A comparison between the predicted data and the experimental data was conducted. The results show that the theoretical model can accurately predict the mechanical performance of C-EPMM. The conclusions derived from this work can provide a new method for adjusting the mechanical performance of EPMM in applications.

Interfacial Adhesion and Microstructure of Epoxy/Aluminium Particulate Nanocomposites

2021 ◽  
Vol 32 ◽  
pp. 1-14
Author(s):  
Sefiu Adekunle Bello ◽  
Johnson Olumuyiwa Agunsoye ◽  
Nasirudeen Kolawole Raji ◽  
Jeleel Adekunle Adebisi ◽  
Isiaka Ayobi Raheem ◽  
...  
Keyword(s):  
Interfacial Adhesion ◽  
Mechanical Performance ◽  
Epoxy Composite ◽  
Particulate Composites ◽  
Structural Applications ◽  
Coordinate Bond ◽  
Electron Microscopes ◽  
The Fourier Transform ◽  
Scanning Electron Microscopes ◽  
Poor Adhesion

Fibres anisotropy and their poor adhesion to the epoxy matrix are challenges in developing polymeric epoxy composite for structural applications. Filling of epoxy with reinforcing particles has potential for producing isotropic composites. In this study, epoxy-aluminium particulate composites were developed through combined-stir-techniques. Their interfacial adhesion and microstructural properties were examined. Results obtained indicated bonding of aluminium particles to epoxy through bidentate coordinate bond. Variations observed in the Fourier Transform Infrared spectrographs (FTIR) of both composites’ grades confirm discrepancies in interactions of aluminium micro and nanoparticles with epoxy. A good interfacial adhesion of aluminium nanoparticle with epoxy established by both optical and scanning electron microscopes is an indication of good mechanical performance of the epoxy composites.

Disappearance Voltage Determinations Using a Convergent Beam

1971 ◽  
Vol 29 ◽  
pp. 184-185
Author(s):  
W. L. Bell
Keyword(s):  
Second Order ◽  
Objective Method ◽  
Uniform Thickness ◽  
Rocking Curve ◽  
Crystal Perfection ◽  
Kikuchi Line ◽  
Central Maximum ◽  
Diffraction Patterns ◽  
Convergent Beam ◽  
Beam Technique

Disappearance voltages for second order reflections can be determined experimentally in a variety of ways. The more subjective methods, such as Kikuchi line disappearance and bend contour imaging, involve comparing a series of diffraction patterns or micrographs taken at intervals throughout the disappearance range and selecting that voltage which gives the strongest disappearance effect. The estimated accuracies of these methods are both to within 10 kV, or about 2-4%, of the true disappearance voltage, which is quite sufficient for using these voltages in further calculations. However, it is the necessity of determining this information by comparisons of exposed plates rather than while operating the microscope that detracts from the immediate usefulness of these methods if there is reason to perform experiments at an unknown disappearance voltage.The convergent beam technique for determining the disappearance voltage has been found to be a highly objective method when it is applicable, i.e. when reasonable crystal perfection exists and an area of uniform thickness can be found. The criterion for determining this voltage is that the central maximum disappear from the rocking curve for the second order spot.

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