Individual multiwalled carbon nanotubes with a range of aspect ratios are subjected to cyclic axial compression to large strains using atomic force microscopy. Distinct elastic buckling and post-buckling phenomena are observed reproducibly and are ascribed to Euler, asymmetric shell buckling (i.e., kinking), and symmetric shell buckling. These show agreement with continuum theories that range from approximate to remarkable. Shell buckling yields reproducible incremental negative stiffness in the initial post-buckled regime.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1021/nl062763b | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Simplified calculation method for the critical load bearing of market-based profile emergency steel pier.
Heliyon
November 2024
Collaborative Innovation Center for Performance and Security of Large-scale Infrastructure, Shijiazhuang Tiedao University, Shijiazhuang, China.
Article Synopsis
- * The study developed an analytical formula to determine the critical load capacity of the steel pier under emergency conditions, considering factors like buckling modes and girder connections.
- * A simplified calculation method was introduced, making it more practical for engineers to assess the pier's load capacity using a few key variables, enhancing its usability in emergencies.
Self-locking and stiffening deployable tubular structures.
Proc Natl Acad Sci U S A
October 2024
Centre for Innovative Structures and Materials, School of Engineering, RMIT University, Melbourne, VIC 3001, Australia.
Deployable tubular structures, designed for functional expansion, serve a wide range of applications, from flexible pipes to stiff structural elements. These structures, which transform from compact states, are crucial for creating adaptive solutions across engineering and scientific fields. A significant barrier to advancing their performance is balancing expandability with stiffness.
View Article and Find Full Text PDFThermal buckling analysis of reinforced composite conical shells in acidic environments: Numerical and experimental investigation on the effects of nanoparticles.
Heliyon
September 2024
Department of Mechanical Engineering, Amirkabir University of Technology (Tehran Polytechnic), Tehran, Iran.
This study investigates the effects of acid penetration and temperature on the buckling behavior of conical composite shells, to enhance structural integrity and longevity in corrosive environments. The study explores the impact of acid exposure on thermal properties and examines the efficacy of incorporating nano-silica and nano-clay in preventing buckling. Additionally, it analyzes the influence of nanoparticles on the thermal, moisture, and mechanical properties of the composite material.
View Article and Find Full Text PDFFrictional Contact of Soft Polymeric Shells.
Phys Rev Lett
September 2024
Department of Mechanical and Production Engineering, Aarhus University, Aarhus, Denmark.
The classical Hertzian contact model establishes a monotonic correlation between contact force and area. Here, we showed that the interplay between local friction and structural instability can deliberately lead to unconventional contact behavior when a soft elastic shell comes into contact with a flat surface. The deviation from Hertzian solution first arises from bending within the contact area, followed by the second transition induced by buckling, resulting in a notable decrease in the contact area despite increased contact force.
View Article and Find Full Text PDFImperfection-Enabled Strengthening of Ultra-Lightweight Lattice Materials.
Adv Sci (Weinh)
November 2024
Department of Mechanical and Automation Engineering, Chinese University of Hong Kong, Sha Tin, Hong Kong, 999077, China.
Lattice materials are an emerging family of advanced engineering materials with unique advantages for lightweight applications. However, the mechanical behaviors of lattice materials at ultra-low relative densities are still not well understood, and this severely limits their lightweighting potential. Here, a high-precision micro-laser powder bed fusion technique is dveloped that enables the fabrication of metallic lattices with a relative density range much wider than existing studies.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!