Dynamic Response of a Grid-Stiffened Composite Cylindrical Shell Reinforced with Carbon Nanotubes to a Radial Impulse Load

2021 ◽  
Author(s):  
A. Davar ◽  
R. Azarafza ◽  
M. S. Fayez ◽  
S. Fallahi ◽  
J. E. Jam
Keyword(s):  
Carbon Nanotubes ◽  
Cylindrical Shell ◽  
Dynamic Response ◽  
Composite Cylindrical Shell ◽  
Impulse Load

scholarly journals Analytical Investigation of the Vibrational and Dynamic Response of Nano-Composite Cylindrical Shell Under Thermal Shock and Mild Heat Field by DQM Method

2020 ◽  
Vol 3 (1) ◽  
pp. 22-36
Author(s):  
Masoud Rahmani ◽  
Amin Moslemi Petrudi
Keyword(s):  
Carbon Nanotubes ◽  
Cylindrical Shell ◽  
Dynamic Response ◽  
Natural Frequency ◽  
Thermal Field ◽  
Differential Quadrature Method ◽  
Composite Layer ◽  
Heat Equations ◽  
Composite Cylindrical Shell ◽  
Heat Field

In this paper, the vibrations and dynamic response of an orthotropic thin-walled composite cylindrical shell with epoxy graphite layers reinforced with carbon nanotubes under heat shock and heat field loading are investigated. the carbon nanotubes were uniformly distributed along the thickness of the composite layer. The problem is that at first there is a temperature change due to the thermal field in the cylinder and the cylinder is coincident with the thermal field, then the surface temperature of the cylinder rises abruptly. Partial derivative equations of motion are coupled to heat equations. The differential quadrature method (DQM) is used to solve the equations. In this study, the effects of length, temperature, thickness and radius parameters on the natural frequencies and mid-layer displacement are investigated. The results show that increasing the outside temperature reduces the natural frequency and increases the displacement of the system. Radial displacement results were also compared with previous studies and were found to be in good agreement with previous literature. Increasing the percentage of carbon nanotubes also increased the natural frequency of the system and decreased the mobility of the middle layer.

Dynamic Response of Laminated Composite Cylindrical Shell Subjected to Pure Impact

2012 ◽  
Vol 229-231 ◽  
pp. 2577-2581 ◽  
Author(s):  
Farzin Firouzabadi ◽  
Amran Bin Ayob ◽  
M. Moradpour ◽  
R. Heidarpour ◽  
Nayeleh Deirram
Keyword(s):  
Cylindrical Shell ◽  
Dynamic Response ◽  
Contact Force ◽  
Contact Point ◽  
Laminated Composite ◽  
Point Load ◽  
Published Data ◽  
Cylinder Surface ◽  
Composite Cylindrical Shell ◽  
The Impact

In contrast with all advantages of composite materials, susceptibility of these materials to impact damage became a major concern recently. The aim of this research is to investigate the dynamic response of laminated composite cylindrical shell subjected to pure impact numerically. For this purpose, the impact of a steel ball on composite cylinder is modeled in Abaqus software as a point load and the amount of radial deflection and contact force of the contact point on cylinder surface is recorded for whole period of contact motion. To validate the obtained results they were compared with the exactly the same model in published data. According to obtained results, both of radial deflection and contact force have a parabolic variation during the impact motion. The maximum radial deflection occurs when the striker has its maximum penetration and bouncing back motion is just about to start.

Effect of carbon nanotubes reinforcement on eigenmodes of multi‐smart core sandwich composite cylindrical shell panels

2021 ◽  
Author(s):  
A. N. Shankar ◽  
S. M. Murali Krishna ◽  
Rohinikumar Chebolu ◽  
Ajay Singholi ◽  
Rasmeet Singh ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Cylindrical Shell ◽  
Sandwich Composite ◽  
Composite Cylindrical Shell

scholarly journals Simulation of the Load Evolution of an Anchoring System under a Blasting Impulse Load Using FLAC3D

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Xigui Zheng ◽  
Jinbo Hua ◽  
Nong Zhang ◽  
Xiaowei Feng ◽  
Lei Zhang
Keyword(s):  
Shear Stress ◽  
Dynamic Response ◽  
Axial Force ◽  
Mechanical Characteristics ◽  
Oscillation Amplitude ◽  
Anchoring System ◽  
Impulse Load ◽  
The Stability ◽  
Calculation Software ◽  
Dynamic Perturbation

A limitation in research on bolt anchoring is the unknown relationship between dynamic perturbation and mechanical characteristics. This paper divides dynamic impulse loads into engineering loads and blasting loads and then employs numerical calculation software FLAC3Dto analyze the stability of an anchoring system perturbed by an impulse load. The evolution of the dynamic response of the axial force/shear stress in the anchoring system is thus obtained. It is revealed that the corners and middle of the anchoring system are strongly affected by the dynamic load, and the dynamic response of shear stress is distinctly stronger than that of the axial force in the anchoring system. Additionally, the perturbation of the impulse load reduces stress in the anchored rock mass and induces repeated tension and loosening of the rods in the anchoring system, thus reducing the stability of the anchoring system. The oscillation amplitude of the axial force in the anchored segment is mitigated far more than that in the free segment, demonstrating that extended/full-length anchoring is extremely stable and surpasses simple anchors with free ends.

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