Model of the nonlinear elastic behavior of a powder composite material. I. Properties of heteroresistant powder materials

In this study, the possibility of using of the following technogenic raw materials to obtain a composite material was considered: titanium-containing slag, with the addition of aluminum bronze grade PG-19M-01 (TU 48-4206-156-82) and aluminum powder grade PA-4 (GOST 6058-73). The percentage of components in the mixture were as follows (wt. %): slag - 40, PG-19M-01 - 30, PA-4 - 30. A thermodynamic simulation of the selected system was preliminarily carried out using TERRA program in the temperature range 273 - 4273 K. The chemical and granulometric composition of the initial powders was investigated. From the powder mixture there were compressed the tablets and then they were sintered in an inert atmosphere. Micro-X-ray analysis of sintered samples showed that they consist of large particles of various shapes, most likely containing titanium and iron aluminides, their compounds between themselves and with copper. Keywords: titanium-containing slag, composite material, thermodynamic modeling, intermetallic compounds, pressing, powder materials

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A set of measures for the systematic classification of the nonlinear elastic behavior of disparate rocks

Journal of Geophysical Research Solid Earth ◽

10.1002/2014jb011718 ◽

2015 ◽

Vol 120 (3) ◽

pp. 1587-1604 ◽

Cited By ~ 41

Author(s):

Jacques Rivière ◽

Parisa Shokouhi ◽

Robert A. Guyer ◽

Paul A. Johnson

Keyword(s):

Elastic Behavior ◽

Systematic Classification ◽

Nonlinear Elastic

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Digital image correlation to analyze nonlinear elastic behavior of materials

2017 IEEE International Conference on Image Processing (ICIP) ◽

10.1109/icip.2017.8297107 ◽

2017 ◽

Author(s):

Nirusha Phillips ◽

Ghulam Mubashar Hassan ◽

Arcady Dyskin ◽

Cara MacNish ◽

Elena Pasternak

Keyword(s):

Digital Image Correlation ◽

Digital Image ◽

Image Correlation ◽

Elastic Behavior ◽

Nonlinear Elastic

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Nonlinear Elastic Waves in a 1D Layered Composite Material: Some Numerical Results

10.1063/1.3638045 ◽

2011 ◽

Cited By ~ 1

Author(s):

Igor Andrianov ◽

Vladislav Danishevs’kyy ◽

Dieter Weichert ◽

Heiko Topol ◽

Theodore E. Simos ◽

...

Keyword(s):

Composite Material ◽

Elastic Waves ◽

Layered Composite ◽

Numerical Results ◽

Layered Composite Material ◽

Nonlinear Elastic

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Random Fiber Networks With Superior Properties Through Network Topology Control

Journal of Applied Mechanics ◽

10.1115/1.4043828 ◽

2019 ◽

Vol 86 (8) ◽

Cited By ~ 1

Author(s):

S. Deogekar ◽

Z. Yan ◽

R. C. Picu

Keyword(s):

Network Architecture ◽

Elastic Behavior ◽

Fiber Networks ◽

Linear Elastic ◽

New Class ◽

Link Density ◽

Cross Link Density ◽

Random Fiber Networks ◽

Nonlinear Elastic ◽

Poisson Contraction

In this work, we study the effect of network architecture on the nonlinear elastic behavior and strength of athermal random fiber networks of cellular type. We introduce a topology modification of Poisson–Voronoi (PV) networks with convex cells, leading to networks with stochastic nonconvex cells. Geometric measures are developed to characterize this new class of nonconvex Voronoi (NCV) networks. These are softer than the reference PV networks at the same nominal network parameters such as density, cross-link density, fiber diameter, and connectivity number. Their response is linear elastic over a broad range of strains, unlike PV networks that exhibit a gradual increase of the tangent stiffness starting from small strains. NCV networks exhibit much smaller Poisson contraction than any network of same nominal parameters. Interestingly, the strength of NCV networks increases continuously with an increasing degree of nonconvexity of the cells. These exceptional properties render this class of networks of interest in a variety of applications, such as tissue scaffolds, nonwovens, and protective clothing.

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A Pump-Probe Analysis of Nonlinear Elastic Behavior on the San Andreas Fault

10.5194/egusphere-egu2020-4534 ◽

2020 ◽

Author(s):

Andrew Delorey

Keyword(s):

San Andreas Fault ◽

Earth Tides ◽

Elastic Behavior ◽

Fracture Networks ◽

Pump Probe ◽

San Andreas ◽

The Earth ◽

Probe Analysis ◽

Highly Nonlinear ◽

Nonlinear Elastic

Fracture networks in the subsurface influence nearly every aspect of earthquakes and natural hazards.&#160; These aspects, including stress, permeability and material failure, and are important for hazard assessment. However, our ability to monitor fracture behavior in the Earth is insufficient for any type of decision-making regarding hazard avoidance.&#160; I propose a new method for probing the evolution of fracture networks in situ to inform public safety decisions and understand natural systems.&#160;In heterogeneous, fractured materials, like those found in the Earth, the relationship between stress and strain is highly nonlinear.&#160; This nonlinearity in the upper crust is almost entirely due to fractures.&#160; By measuring to what extent Earth materials exhibit nonlinear elastic behavior, we can learn more information about them.&#160; Directly, measuring physical properties may be more useful than just detecting that fractures are present or how they are shaped and oriented.&#160; We measure nonlinearity by measuring the apparent modulus at different strains.&#160;In this study we use a pump-probe analysis, which involves continuously probing velocity (as a proxy for modulus) while systematically straining the material.&#160; We will use solid Earth tides as a strain pump and empirical Green&#8217;s functions (EGF) as a velocity probe.&#160; We apply this analysis to the San Andreas Fault near Parkfield, California.&#160; We chose Parkfield because there is a long-term deployment of borehole seismic instruments that recorded before and after a M6 earthquake.&#160; We find evidence that nonlinear behavior is correlated with the seismic cycle and therefore it may contain information on the both the evolution and current state of stress on faults.&#160;

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A Robot Gripper in Polymeric Material for Solid Micro-Meso Parts

International Journal of Automation Technology ◽

10.20965/ijat.2017.p0311 ◽

2017 ◽

Vol 11 (2) ◽

pp. 311-321 ◽

Cited By ~ 9

Author(s):

Francesco Aggogeri ◽

◽

Andrea Avanzini ◽

Alberto Borboni ◽

Stefano Pandini

Keyword(s):

Polymeric Material ◽

Low Cost ◽

Material Model ◽

Elastic Behavior ◽

Mechanical Transmission ◽

Element Analysis ◽

Robot Gripper ◽

Simple Geometry ◽

Deformable Materials ◽

Nonlinear Elastic

This paper proposes a robot gripper in polymeric material for solid micro-meso parts. The gripper is developed using a light-weight, highly deformable and low cost material, that allows elastic deformations. The proposed solution consists of a simple geometry, incorporating the complexity of the mechanical transmission in the non-linear high deformations of the flexible elements of the device. This choice permits to grip multi-sizes objects. The design approach focuses on Ludwick material model, that describes deformable materials with a nonlinear elastic behavior. The kinematics of the gripper is presented and the results are verified with the finite element analysis. Finally, the gripper was fabricated and validated through a set of experimetal tests. The obtained resulsts confirmed the theoretical and simultion models. The maximum opening and force of the gripping jaws are 1,500 μm and 155 mN, repsectively. Nevetheless further performances may be obtained using different geometrical choices developed in the kinematic analysis.

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