Effect of Impact Velocity on Dynamic Response of Polymeric Foams

2022 ◽  
pp. 73-78
Author(s):  
Vijendra Gupta ◽  
Chizoba Onwuka ◽  
Addis Kidane ◽  
Michael Sutton
Keyword(s):  
Dynamic Response ◽  
Impact Velocity ◽  
Polymeric Foams

EFFECT OF RELATIVE DENSITY AND VELOCITY TOWARDS DYNAMIC RESPONSE OF METAL FOAM

2015 ◽  
Vol 76 (9) ◽  
Author(s):  
Mohd Azman Y. ◽  
Juri S. ◽  
Hazran H. ◽  
NorHafiez M. N. ◽  
Dong R.
Keyword(s):  
Finite Element ◽  
Dynamic Response ◽  
Theoretical Prediction ◽  
Relative Density ◽  
Impact Velocity ◽  
Impact Test ◽  
Metal Foam ◽  
Element Analysis ◽  
Static Tests ◽  
The Impact

Dynamic response of ALPORAS aluminium foam has been investigated experimentally and numerically. The dynamic response is quantified by the force produced as the foam deforms as a function of time. Quasi-static tests are conducted to determine the quasi-static properties of the foam. In the impact test, the aluminium foams are fired towards a rigid load-cell and the force signals developed are recorded. Experimental dynamic stress is also compared with theoretical prediction using existing theory. Finite element model is constructed using LS-DYNA to simulate the impact test. Results from the experiment, finite element analysis and theoretical prediction are in acceptable agreement. Finally, parametric studies have been conducted using the verified model to investigate the effect of impact velocity and relative density towards the dynamic response of the foam projectile. It is found that the dynamic response of the foam is more sensitive towards impact velocity as compare with the foam relative density.

scholarly journals Dynamic Response of Aluminum Honeycomb Sandwich Plate Subjected to Impact by Flying Spear

2018 ◽  
Vol 198 ◽  
pp. 02005
Author(s):  
Chun Cheng ◽  
Xi Chen ◽  
Zhonghua Du ◽  
Zhaojun Pang ◽  
Jiyue Si
Keyword(s):  
Dynamic Response ◽  
Impact Velocity ◽  
Sandwich Plate ◽  
Deformation Mode ◽  
Maximum Diameter ◽  
Honeycomb Sandwich ◽  
Honeycomb Sandwich Plate ◽  
Aluminum Honeycomb ◽  
Honeycomb Cell ◽  
The Impact

Numerical simulation and experiment were applied to study the dynamic response of aluminum honeycomb sandwich plate subjected to the impact by flying spear as well as the the proper velocity of the flying spear impacting on the plate. The deformation mode and damage form of the aluminum honeycomb sandwich plate were obtained. Moreover, the proper velocity of the flying spear is around 40m/s~50m/s. It is confirmed that The deformation area of the upper and lower panels decreases with the increase of the impact velocity, whereas the buckling angle of the panel increases with the increase of the impact velocity. The damage forms of the aluminum honeycomb cell are collapse and buckling sequentially from the impact point to the surrounding. In addition, The collapse area of the honeycomb cells increases with the increase of the maximum diameter of the flying spear and the range of buckling decreases with the increase of impact velocity. The experimental results are in good agreement with the simulation results.

Parametric Analysis of the Dynamic Response of Hot-Rolled H-Shaped Steel Beam under Lateral Impact Load

2012 ◽  
Vol 215-216 ◽  
pp. 998-1002 ◽  
Author(s):  
Chang Pei ◽  
Rui Wang
Keyword(s):  
Dynamic Response ◽  
Impact Velocity ◽  
Impact Energy ◽  
Impact Load ◽  
Steel Beam ◽  
Lateral Impact ◽  
Analysis Model ◽  
Fea Model ◽  
Hot Rolled ◽  
The Impact

The analysis on the basic mechanical properties of hot-rolled H-shaped steel beam under lateral impact load was done by use of ABAQUS. The reliability of the FEA model was verified through comparing with the existing experiment of H-shaped steel beam subjected to lateral impact. And then, this FEA model was used to research the dynamic response of the H-shaped steel beam subjected to lateral impact. The main parameters include the impact energy, mass and impact velocity of the impact hammer. The results indicate that the finite element analysis model built in this paper could accurately simulate the process of hot-rolled H-shaped steel beam under lateral impact load and the impact energy, mass and impact velocity have different influences on the dynamic response of H-shaped steel beam.

scholarly journals Bird Strike Analysis on 19 Passenger Aircraft Windshield with Different Thickness and Impact Velocity

2020 ◽  
Vol 5 (2) ◽  
Author(s):  
Budi Aji Warsiyanto
Keyword(s):  
Dynamic Response ◽  
Impact Velocity ◽  
Civil Aviation ◽  
Bird Strike ◽  
Elastic Plastic ◽  
Safety Regulations ◽  
Passenger Aircraft ◽  
Certification Requirements ◽  
The Impact ◽  
Different Thickness

Abstrct - A Windshield is a component that must be tested to comply with the certification requirements in the bird strike phenomenon based on Civil Aviation Safety Regulations (CASR) subpart 23.775. The purpose of this study is to obtain the thickness of 19 passenger aircraft windshield that meets the certification requirements and determine the dynamic response of the windshield to impact velocity variations. The finite element is used to simulate bird strike phenomena. The elastic-plastic polymethyl methacrylate (PMMA) material with the maximum principal strain failure criterion is used to model the dynamic response of the windshield. Numerical modeling is validated, both with analytical and experimental results which are then used to investigate the effect of variations in windshield thickness and impact velocity. The results obtained that with a thickness of 9 mm, the windshield is able to withstand bird strikes based on cases that have been determined by the regulation. In addition, the impact velocity that causes the dynamic response of the windshield in the elastic, plastic deformation, and the greatest failure is the velocity of 87.5 ms-1(cruising phase). The uppermost of the windshield (fixed) is the weakest part due to the stress concentration.

Human pilot dynamic response in flight and simulator.

1958 ◽  
Author(s):  
Edward Seckel ◽  
Ian A. M. Hall ◽  
Duane T. McRuer ◽  
David H. Weir
Keyword(s):  
Dynamic Response
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