The mechanics of two-dimensional cellular materials

1982 ◽  
Vol 382 (1782) ◽  
pp. 25-42 ◽  
Keyword(s):  
Mechanical Properties ◽  
Cell Walls ◽  
Cellular Materials ◽  
Elastic Buckling ◽  
Plastic Collapse ◽  
Two Dimensional ◽  
Linear And Nonlinear ◽  
Nonlinear Elastic

The mechanical properties (linear and nonlinear elastic and plastic) of two-dimensional cellular materials, or honeycombs, are analysed and compared with experiments. The properties are well described in terms of the bending, elastic buckling and plastic collapse of the beams that make up the cell walls.

scholarly journals Stiffness and strength of a semi-regular lattice

2017 ◽  
Vol 50 (3) ◽  
pp. 137-140
Author(s):  
Tomas Their ◽  
Luc St-Pierre
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
High Strength ◽  
Elastic Buckling ◽  
Low Density ◽  
Two Dimensional ◽  
Regular Lattice ◽  
Dimensional Lattice ◽  
Lattice Materials ◽  
Analytical Expressions

Honeycombs and other lattice materials have the advantage that their topology can be designed to achieve unique combinations of properties, such as high strength at low density.  The work presented here is exploratory in nature: we investigated the mechanical properties of a two-dimensional lattice and compared its performances to other topologies.  Analytical expressions for the uniaxial stiffness and compressive strength were developed and validated against Finite Element simulations.  The results showed that the lattice considered is stiffer and stronger than the diamond lattice, and has a higher resistance to elastic buckling than the triangular lattice.  

Microdynamics of Crushing in Cellular Solids

1988 ◽  
Vol 110 (2) ◽  
pp. 185-190 ◽  
Author(s):  
W. J. Stronge ◽  
V. P.-W. Shim
Keyword(s):  
Strain Rate ◽  
Cell Walls ◽  
Strain Softening ◽  
Plastic Collapse ◽  
Cellular Solids ◽  
Two Dimensional ◽  
Deformation Localization ◽  
Strain Rate Effects ◽  
Softening Behavior ◽  
Rate Effects

Lightweight, open-celled foams and honeycombs can exhibit deformation localization during static crushing as a result of buckling and plastic collapse of cell walls. Localization of deformation is a manifestation of strain-softening behavior that limits transmitted forces through these shock mitigating materials. Collision tests on two-dimensional cellular solids with strain-softening behavior reveal that with some microstructures, strain-rate effects can stabilize less compliant modes of deformation. When stabilization occurs, it amplifies the intensity of transmitted shocks.

Determination of the equivalent properties of periodic heterogeneous composite plates using the structural genome approach

2019 ◽  
Vol 08 (04) ◽  
pp. 1950017
Author(s):  
Yiran Jia ◽  
Jincheng Lei ◽  
Zishun Liu ◽  
Heow Pueh Lee
Keyword(s):  
Mechanical Properties ◽  
Structural Model ◽  
Composite Plates ◽  
Periodic Boundary Conditions ◽  
Simple Approach ◽  
Linear And Nonlinear ◽  
Nonlinear Elastic ◽  
Equivalent Properties ◽  
Sufficient Precision

A structural genome (SG) is defined as the smallest structural building block of composite materials. In this study, we use the concept of structure genome to propose a simple approach for obtaining the equivalent mechanical properties of periodic heterogeneous composite plates. Firstly, an SG from the structural model of a periodic heterogeneous composite plate is extracted. Secondly, a python script is developed in commercial software ABAQUS to conveniently impose periodic boundary conditions and apply different loads on the SG as well as obtain the equivalent mechanical properties of the structural genome. To verify the proposed SG approach, numerical examples are presented and discussed for both linear and nonlinear elastic cases. The results show that this approach is efficient and the results are of sufficient precision to calculate the mechanical properties of both linear and nonlinear elastic periodic heterogeneous composite plates.

scholarly journals Performance of SCAN Meta-GGA Functionals on Nonlinear Mechanics of Graphene-Like g-SiC

Crystals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 120
Author(s):  
Qing Peng
Keyword(s):  
Mechanical Properties ◽  
Density Functional ◽  
Large Strains ◽  
Two Dimensional ◽  
Nonlinear Mechanics ◽  
Generalized Gradient ◽  
Mechanics Of Materials ◽  
Nonlinear Mechanical ◽  
Direct Band ◽  
Simulations And Modeling

Although meta-generalized-gradient approximations (meta-GGAs) are believed potentially the most accurate among the efficient first-principles calculations, the performance has not been accessed on the nonlinear mechanical properties of two-dimensional nanomaterials. Graphene, like two-dimensional silicon carbide g-SiC, has a wide direct band-gap with applications in high-power electronics and solar energy. Taken g-SiC as a paradigm, we have investigated the performance of meta-GGA functionals on the nonlinear mechanical properties under large strains, both compressive and tensile, along three deformation modes using Strongly Constrained and Appropriately Normed Semilocal Density Functional (SCAN) as an example. A close comparison suggests that the nonlinear mechanics predicted from SCAN are very similar to that of Perdew-Burke-Ernzerhof (PBE) formulated functional, a standard Density Functional Theory (DFT) functional. The improvement from SCAN calculation over PBE calculation is minor, despite the considerable increase of computing demand. This study could be helpful in selection of density functionals in simulations and modeling of mechanics of materials.

scholarly journals A Review on Tailoring Stiffness in Compliant Systems, via Removing Material: Cellular Materials and Topology Optimization

2021 ◽  
Vol 11 (8) ◽  
pp. 3538
Author(s):  
Mauricio Arredondo-Soto ◽  
Enrique Cuan-Urquizo ◽  
Alfonso Gómez-Espinosa
Keyword(s):  
Mechanical Properties ◽  
Topology Optimization ◽  
Evolutionary Process ◽  
Cellular Materials ◽  
Related Literature ◽  
And Topology ◽  
Fundamental Process ◽  
Compliant Systems ◽  
Basic Concepts

Cellular Materials and Topology Optimization use a structured distribution of material to achieve specific mechanical properties. The controlled distribution of material often leads to several advantages including the customization of the resulting mechanical properties; this can be achieved following these two approaches. In this work, a review of these two as approaches used with compliance purposes applied at flexure level is presented. The related literature is assessed with the aim of clarifying how they can be used in tailoring stiffness of flexure elements. Basic concepts needed to understand the fundamental process of each approach are presented. Further, tailoring stiffness is described as an evolutionary process used in compliance applications. Additionally, works that used these approaches to tailor stiffness of flexure elements are described and categorized. Finally, concluding remarks and recommendations to further extend the study of these two approaches in tailoring the stiffness of flexure elements are discussed.

scholarly journals Temperature-Dependent Creep Behavior and Quasi-Static Mechanical Properties of Heat-Treated Wood

Forests ◽  
2021 ◽  
Vol 12 (8) ◽  
pp. 968
Author(s):  
Dong Xing ◽  
Xinzhou Wang ◽  
Siqun Wang
Keyword(s):  
Mechanical Properties ◽  
Creep Behavior ◽  
Cell Walls ◽  
Treated Wood ◽  
Crosslinking Reaction ◽  
Depth Sensing ◽  
Temperature Dependent ◽  
Heat Treated ◽  
Static Mechanical ◽  
Static Mechanical Properties

In this paper, Berkovich depth-sensing indentation has been used to study the effects of the temperature-dependent quasi-static mechanical properties and creep deformation of heat-treated wood at temperatures from 20 °C to 180 °C. The characteristics of the load–depth curve, creep strain rate, creep compliance, and creep stress exponent of heat-treated wood are evaluated. The results showed that high temperature heat treatment improved the hardness of wood cell walls and reduced the creep rate of wood cell walls. This is mainly due to the improvement of the crystallinity of the cellulose, and the recondensation and crosslinking reaction of the lignocellulose structure. The Burgers model is well fitted to study the creep behavior of heat-treated wood cell walls under different temperatures.

Nanostructural changes in bamboo cell walls with aging and their possible effects on mechanical properties

2017 ◽  
Vol 53 (6) ◽  
pp. 3972-3980 ◽  
Author(s):  
Yoko Okahisa ◽  
Keisuke Kojiro ◽  
Tomoaki Kiryu ◽  
Takahiro Oki ◽  
Yuzo Furuta ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Cell Walls

Monitoring the Travel Characteristics of High Voltage Circuit Breaker Based on TLD

2014 ◽  
Vol 687-691 ◽  
pp. 938-941
Author(s):  
Bao Shu Li ◽  
Shang Chen ◽  
Xian Ping Zhao ◽  
Wei Hua Niu
Keyword(s):  
Mechanical Properties ◽  
Circuit Breaker ◽  
Travel Speed ◽  
Video Tracking ◽  
Two Dimensional ◽  
High Voltage Circuit Breaker ◽  
Vacuum Circuit Breaker ◽  
Tracking Technology ◽  
Methods Of Measurement ◽  
Speed Characteristic

For the circuit breaker, mechanical fault make up the largest share of the fault. In order to ensure reliable and secure power system can run,it is necessary to monitor the mechanical properties of the circuit breaker,which includes monitoring the breaker trip.By TLD video tracking technology ZN65-12 vacuum circuit breaker mechanical properties were measured,obtain a two-dimensional direction of travel, speed characteristic curves.The experimental results show that the error of the method used to obtain a circuit breaker stroke, speed and other parameters of not more than 1mm,compared with traditional methods of measurement can get richer information.

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