scholarly journals Numerical and experimental analyses of non-energy absorbing lighting poles

2018 ◽  
Vol 38 (1) ◽  
pp. 71-74
Author(s):  
Tomasz Ireneusz Jedliński ◽  
Jacek Buśkiewicz ◽  
Paweł Fritzkowski
Keyword(s):  
Numerical Analysis ◽  
Kinetic Energy ◽  
Experimental Tests ◽  
Production Costs ◽  
Test Track ◽  
Impact Speed ◽  
Safety Requirements ◽  
Thin Walled ◽  
Experimental Analyses ◽  
Energy Absorbing

Abstract Apart from the strength requirements, modern lighting pole designs have to meet a number of safety requirements in the event of collisions. The paper compares the experimental tests performed at the collision test track according to EN 12767 with the results of the numerical analysis carried out in Ansys LS-DYNA. The objective of the work is to prepare a new structure of a thin-walled lighting pole of steel which minimizes absorption of the kinetic energy of the vehicle and, simultaneously, its production costs are comparable to those of a standard pole. The tests were carried out at an impact speed of 100 km/h.

Crashworthiness Analysis and Optimization of Thin-Walled Square Tube with Pyramidal Ripples Based on Mechanics Properties

2012 ◽  
Vol 625 ◽  
pp. 69-74
Author(s):  
Xiao Guang Hu ◽  
Jing Bo Yang
Keyword(s):  
Kinetic Energy ◽  
Impact Load ◽  
Explicit Finite Element ◽  
Surface Method ◽  
Finite Element Technology ◽  
Thin Walled ◽  
Crashworthiness Analysis ◽  
Energy Absorbing ◽  
Impact Kinetic Energy ◽  
Load Simulation

Thin-walled structure absorbs most impact kinetic energy during collision accident,and they are widely used as energy-absorbing element. In order to improve crashworthiness of them, regular pyramidal ripple is added on the thin-walled square tube’s surface. Explicit finite element technology is applied to simulate the behavior of the tube under axial impact load. Simulation data was delt with by Response Surface Method to form a function of variables and response,and the new structure was optimized. Research results show that, the thin-walled square tube with pyramidal ripples can improve controllable of structure deformation obviously and Optimized structure can absorb and dissipate much more impact kinetic energy.

scholarly journals Experimental and Numerical Studies of Low-Profile, Triangular Grid-Stiffened Plates Subjected to Shear Load in the Post-Critical States of Deformation

Materials ◽  
2019 ◽  
Vol 12 (22) ◽  
pp. 3699 ◽  
Author(s):  
Łukasz Święch
Keyword(s):  
Pure Shear ◽  
Experimental Tests ◽  
Production Costs ◽  
Image Correlation ◽  
Experimental Investigations ◽  
Triangular Grid ◽  
Reference Structure ◽  
Shear Load ◽  
Low Profile ◽  
Thin Walled

Constant developments in manufacturing technology have made it possible to introduce integrally stiffened elements into load-bearing, thin-walled structures. The application of thin-walled elements with integral stiffeners potentially increases buckling and critical loads to maintain the mass of the structure and lower production costs. This paper presents the results of experimental investigations and numerical Finite Element Modelling (FEM) analyses of low-profile, isosceles grid stiffened, aluminium alloy plates subjected to pure shear load. Conducted research included analysing buckling and post-buckling states of deformation, taking into account both geometrical and physical nonlinear effects. Use of the Digital Image Correlation (DIC) system during the experimental tests created representative equilibrium pathways and recorded displacement field distributions over the plate surface. The model was initially validated against the experimental results. The results for the stiffened plate were compared to the reference structure in the form of a smooth plate with equivalent mass. Comparative analyses included examining the displacement fields and stress efforts over the plates. The stiffening configuration under examination increased the critical buckling load by 300% in comparison to the unstiffened structure with the same mass. Obtained results also indicate potential problems with areas of concentrated stress in the case of an incorrect geometry design near to the boundary conditions.

scholarly journals PERILAKU CONE ALUMINUM TIPIS DENGAN SUDUT YANG BERBEDA DALAM MENYERAP ENERGI IMPAK

2018 ◽  
Vol 1 (2) ◽  
Author(s):  
Witono Hardi
Keyword(s):  
Kinetic Energy ◽  
Unit Length ◽  
The Other ◽  
Total Deformation ◽  
Impact Speed ◽  
Thin Walled Structures ◽  
Thin Tube ◽  
Thin Walled ◽  
Energy Absorbers

The use of thin-walled structures as energy absorbers has been widely known and applied in various fields. Thin-walled structures have the ability to absorb energy very well at various levels of impact speed. In this study, an analysis of the behavior of thin-walled structures with aluminum cone-shaped was carried out. This structure has a length of 200 mm thickness of 2 mm with one end whose diameter is left to remain 50 mm and the other end is made varied; 50 mm, 64 mm, 84 mm, 104 mm and 124 mm. A pounder made of cube-shaped steel measuring 15 cm x 15 cm x 15 cm weighing 26.49 kg pounding the specimen at a speed of 10 m / s so that the kinetic energy is received is 1324.7 Joules. Deformation with certain patterns in thin-walled structures and the results of the simulation obtained are total deformation, bending pattern, and energy per unit length. From the five specimens, it was found that the thin tube had a longer deformation than the cone shape. But the cone's ability to absorb more energy is indicated by the amount of energy per unit length.

scholarly journals Numerical Evaluation of Structural Safety of Linear Actuator for Flap Control of Aircraft Based on Airworthiness Standard

Aerospace ◽  
2021 ◽  
Vol 8 (4) ◽  
pp. 104
Author(s):  
Dong-Hyeop Kim ◽  
Young-Cheol Kim ◽  
Sang-Woo Kim
Keyword(s):  
Numerical Analysis ◽  
Analytical Method ◽  
Safety Evaluation ◽  
Experimental Tests ◽  
Structural Safety ◽  
Linear Actuator ◽  
The Finite Element Method ◽  
Margin Of Safety ◽  
Verification Methodology ◽  
The Given

Airworthiness standards of Korea recommend verifying structural safety by experimental tests and analytical methods, owing to the development of analysis technology. In this study, we propose a methodology to verify the structural safety of aircraft components based on airworthiness requirements using an analytical method. The structural safety and fatigue integrity of a linear actuator for flap control of aircraft was evaluated through numerical analysis. The static and fatigue analyses for the given loads obtained from the multibody dynamics analysis were performed using the finite element method. Subsequently, the margin of safety and vulnerable area were acquired and the feasibility of the structural safety evaluation using the analytical method was confirmed. The proposed numerical analysis method in this study can be adopted as an analytical verification methodology for the airworthiness standards of civilian aircraft in Korea.

Some comments on the numerical analysis of plates and thin-walled structures

2008 ◽  
Vol 46 (7-9) ◽  
pp. 975-980 ◽  
Author(s):  
Federico Guarracino ◽  
Alastair Walker
Keyword(s):  
Numerical Analysis ◽  
Thin Walled Structures ◽  
Thin Walled
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