Prediction of the mechanical properties of isotropic pure metal-based and two-phase alloy-based porous materials using modified analytical models

Thermoplastic starch/butyl glycol ester copolymer/polylactic acid (TPS/PBSA/PLA) biodegradable composites were prepared by melt-mixing. The structure, microstructure, mechanical properties and heat resistance of the TPS/PBSA/PLA composites were studied by Fourier-transform infrared spectrometry (FTIR), scanning electron microscopy (SEM), tensile test and thermogravimetry tests, respectively. The results showed that PBSA or PLA could bind to TPS by hydrogen bonding. SEM analysis showed that the composite represents an excellent dispersion and satisfied two-phase compatibility when the PLA, TPS and PBSA blended by a mass ration of 10, 30, and 60. The mechanical properties and the heat resistance of TPS/PBSA/PLA composite were improved by adding PLA with content less than 10%, according to the testing results.

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Determination of mechanical properties of two-phase and hybrid nanocomposites: experimental determination and multiscale modeling

Journal of Polymer Engineering ◽

10.1515/polyeng-2020-0312 ◽

2021 ◽

Vol 0 (0) ◽

Author(s):

Mahmoud Haghighi ◽

Hossein Golestanian ◽

Farshid Aghadavoudi

Keyword(s):

Mechanical Properties ◽

Ultimate Strength ◽

Multiscale Modeling ◽

Filler Content ◽

Hybrid Nanocomposites ◽

Dynamics Simulation ◽

Strength Increase ◽

Two Phase ◽

Macro Scale ◽

Elongation To Failure

Abstract In this paper, the effects of filler content and the use of hybrid nanofillers on agglomeration and nanocomposite mechanical properties such as elastic moduli, ultimate strength and elongation to failure are investigated experimentally. In addition, thermoset epoxy-based two-phase and hybrid nanocomposites are simulated using multiscale modeling techniques. First, molecular dynamics simulation is carried out at nanoscale considering the interphase. Next, finite element method and micromechanical modeling are used for micro and macro scale modeling of nanocomposites. Nanocomposite samples containing carbon nanotubes, graphene nanoplatelets, and hybrid nanofillers with different filler contents are prepared and are tested. Also, field emission scanning electron microscopy is used to take micrographs from samples’ fracture surfaces. The results indicate that in two-phase nanocomposites, elastic modulus and ultimate strength increase while nanocomposite elongation to failure decreases with reinforcement weight fraction. In addition, nanofiller agglomeration occurred at high nanofiller contents especially higher than 0.75 wt% in the two-phase nanocomposites. Nanofiller agglomeration was observed to be much lower in the hybrid nanocomposite samples. Therefore, using hybrid nanofillers delays/prevents agglomeration and improves mechanical properties of nanocomposite at the same total filler content.

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Modification of Mechanical Properties of High-Strength Titanium Alloys VT23 and VT23M Due to Impact-Oscillatory Loading

Metals ◽

10.3390/met9010080 ◽

2019 ◽

Vol 9 (1) ◽

pp. 80 ◽

Cited By ~ 5

Author(s):

Mykola Chausov ◽

Janette Brezinová ◽

Andrii Pylypenko ◽

Pavlo Maruschak ◽

Liudmyla Titova ◽

...

Keyword(s):

Mechanical Properties ◽

Titanium Alloys ◽

High Strength ◽

The Self ◽

Self Organization ◽

Two Phase ◽

Rolled Metal ◽

Technological Method ◽

Equilibrium Processes ◽

Production Conditions

A simple technological method is proposed and tested experimentally, which allows for the improvement of mechanical properties in sheet two-phase high-strength titanium alloys VT23 and VT23M on the finished product (rolled metal), due to impact-oscillatory loading. Under impact-oscillatory loading and dynamic non-equilibrium processes (DNP) are realized in titanium alloys, leading to the self-organization of the structure. As a result, the mechanical properties of titanium alloys vary significantly with subsequent loading after the realization of DNP. In this study, the test modes are found, which can be used in the production conditions.

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Mechanical Properties of Equal-Channel Angular Extrusion-Processed Al-20Zn Alloy

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.445.195 ◽

2012 ◽

Vol 445 ◽

pp. 195-200

Author(s):

Murat Aydin ◽

Yakup Heyal

Keyword(s):

Mechanical Properties ◽

Impact Toughness ◽

Equal Channel Angular Extrusion ◽

Considerable Change ◽

Fatigue Properties ◽

Dendritic Microstructure ◽

Two Phase ◽

Angular Extrusion ◽

Alloy Increase ◽

The Impact

The mechanical properties mainly tensile properties, impact toughness and high-cycle fatigue properties, of two-phase Al-20Zn alloy subjected to severe plastic deformation (SPD) via equal-channel angular extrusion (ECAE) using route A up to 2 passes were studied. The ECAE almost completely eliminated as-cast dendritic microstructure including casting defects such as micro porosities. A refined microstructure consisting of elongated micro constituents, α and α+η eutectic phases, formed after ECAE via route A. As a result of this microstructural change, mechanical properties mainly the impact toughness and fatigue performance of the as-cast Al-20Zn alloy increased significantly through the ECAE. The rates of increase in fatigue endurance limit are approximately 74 % after one pass and 89 % after two passes while the increase in impact toughness is 122 %. Also the yield and tensile strengths of the alloy increase with ECAE. However, no considerable change occurred in hardness and percentage elongation of the alloy. It was also observed that the ECAE changed the nature of the fatigue fracture characteristics of the as-cast Al-20Zn alloy.

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Effect of heating temperature and cooling rate on the microstructure and mechanical properties of a Mo-rich two phase α + β titanium alloy

Journal of Materials Research ◽

10.1557/s43578-020-00100-6 ◽

2021 ◽

Author(s):

Diksha Mahadule ◽

Rajesh Kisni Khatirkar ◽

Aman Gupta ◽

Ranjeet Kumar

Keyword(s):

Mechanical Properties ◽

Titanium Alloy ◽

Cooling Rate ◽

Heating Temperature ◽

Two Phase ◽

Microstructure And Mechanical Properties

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Retraction Statement: Effect of High-Energy Electropulsing on the Phase Transition and Mechanical Properties of Two-Phase Titanium Alloy Strips

Advanced Engineering Materials ◽

10.1002/adem.201770028 ◽

2017 ◽

Vol 19 (8) ◽

pp. 1770028

Keyword(s):

Mechanical Properties ◽

Phase Transition ◽

Titanium Alloy ◽

High Energy ◽

Two Phase

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Evaluation methods for predicting the elastic constants of C/Epoxy plain-weave composites by considering the realistic mesostructures

Journal of Composite Materials ◽

10.1177/0021998318781460 ◽

2018 ◽

Vol 53 (2) ◽

pp. 197-208 ◽

Cited By ~ 1

Author(s):

Shan-yuan Jiang ◽

Hao Wang ◽

Zhong-wei Wang

Keyword(s):

Mechanical Properties ◽

Elastic Constants ◽

Stochastic Theory ◽

Textile Composites ◽

Analytical Models ◽

Plane Shear ◽

Elliptical Cross ◽

Variable Metric ◽

Plain Weave ◽

Feature Parameters

Variabilities of mesostructures existing in textile composites can affect their mechanical properties. Most of the deterministic mechanical models are based on the assumptions of ideal Representative Volume Element, which cannot predict the mechanical properties accurately. Two analytical models predicting the elastic constants of C/Epoxy plain-weave composites by considering the realistic mesostructures are presented in this paper. These models utilize the variable metric stochastic theory to introduce the fluctuations of yarn feature parameters (yarn path and elliptical cross-section parameters) into the model of macro elastic properties. C/Epoxy plain-weave composite is taken as an example to quantify the influences of realistic yarn feature parameters on the elastic constants of the composite. The predicted elastic constants by analytical models and finite element method are verified by the results of mechanical experiments. It can be concluded that for C/Epoxy plain-weave composite the stochastic fluctuations of yarn feature parameters reduce in-plane elastic moduli by a maximum of 4%, and increase the in-plane shear modulus and Poisson’s ratio by a maximum of 15% and 33%, respectively.

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