Design Optimization and Structural Integrity Simulation of Aluminum Foam Sandwich Construction for Armored Vehicle Protection

2021 ◽  
pp. 114461
Author(s):  
Arief Nur Pratomo ◽  
Sigit Puji Santosa ◽  
Leonardo Gunawan ◽  
Djarot Widagdo ◽  
Ichsan Setya Putra
Keyword(s):  
Design Optimization ◽  
Aluminum Foam ◽  
Structural Integrity ◽  
Sandwich Construction ◽  
Armored Vehicle

Use of aluminum foam core sandwich structures to improve the blast-mitigation performance of light tactical vehicle side-vent-channel solution

2016 ◽  
Vol 232 (12) ◽  
pp. 993-1011
Author(s):  
M Grujicic ◽  
R Yavari ◽  
JS Snipes ◽  
S Ramaswami
Keyword(s):  
Design Optimization ◽  
Aluminum Foam ◽  
Sandwich Structures ◽  
Optimization Methods ◽  
Gaseous Detonation ◽  
Rocket Engines ◽  
Foam Core ◽  
Blast Mitigation ◽  
Detonation Products ◽  
Tactical Vehicle

In our recent work, a side-vent-channel blast-mitigation concept/solution for light tactical vehicles was proposed. As a part of this solution, side-vent channels are attached to the V-shaped vehicle underbody, in order to promote venting of the soil ejecta and gaseous detonation products and, in turn, generate a downward thrust on the targeted light tactical vehicle. As a consequence, the blast loads resulting from a shallow-buried mine detonated underneath a light tactical vehicle are mitigated, improving the probability for vehicle survival. The concept was motivated by the principles of operation of the so-called “pulse detonation” rocket engines. To quantify the utility and blast-mitigation capacity of this concept, use was made of several computational and design optimization methods and tools in our prior work. It was found that the capacity of the proposed blast-mitigation solution is relatively small, but still noteworthy. The present work focuses on further improvements in the blast-mitigation capacity of the side-vent-channel solution. Specifically, the benefits offered by substitution of the all-steel side-vent channels with side-vent channels made of sandwich structures (consisting of steel face-sheets and aluminum foam core) for all-steel side-vent channels are explored. The results obtained clearly demonstrated that this substitution can improve the blast-mitigation efficiency of the side-vent-channel solution. In addition, through the use of a design optimization analysis, it was established that this improvement can be further increased through proper grading of the aluminum foam density profile through the sandwich structure core.

Novel Impact/Debonding Tolerant Sandwich Panel With Millitubes Grid Stiffened Foam Core

2012 ◽  
Author(s):  
Guoqiang Li ◽  
Gefu Ji ◽  
Su-Seng Pang
Keyword(s):  
Sandwich Panel ◽  
Structural Integrity ◽  
Safety Concern ◽  
Sandwich Panels ◽  
Low Velocity Impact ◽  
Foam Core ◽  
Low Velocity ◽  
The Core ◽  
Sandwich Construction ◽  
Structural Applications

Sandwich construction has been extensively used in various fields. However, sandwich panels have not been fully exploited in critical structural applications due to damage tolerance and safety concern. A major problem of sandwich panels is the debonding at or near the core/face sheet interface, especially under impact loading, which can lead to a sudden loss of structural integrity and cause catastrophic consequences. In order to improve the debonding resistance and energy absorption of sandwich panel under impact loadings, a new foam core is proposed which is a hybrid core consisting of grid stiffened hollow metallic millitubes reinforced polymer matrix. The objective of this study was to characterize its dynamic performances. The core consisted of polymer resin reinforced by grid stiffened continuous metallic millitubes. Low velocity impact test demonstrated that new core panel may be considered a promising option for critical structural applications featured by debonding and multiple impact tolerance.

Optimization of the Shock Mitigation Layer in the Space Frame Joints of an Armored Vehicle

2013 ◽  
Author(s):  
Jagadeep Thota ◽  
Mohamed Trabia ◽  
Brendan O’Toole ◽  
Chang-Hyun Lee ◽  
Hong-Lae Park ◽  
...  
Keyword(s):  
Structural Integrity ◽  
Random Search ◽  
Quadratic Approximation ◽  
Frame Structure ◽  
Optimization Process ◽  
Internal Space ◽  
Space Frame ◽  
Beam Elements ◽  
Shock Mitigation ◽  
Armored Vehicle

Armored vehicles have to survive multiple threats such as projectile or land mines. The shocks induced by these threats can harm vehicle occupants or damage sensitive electronic components. Therefore, a goal of modern armored vehicle design is to reduce transmitted shocks to critical components. In this paper, finite element (FE) models of an armored vehicle prototype having the internal space frame structure with the aforementioned features are developed. One model comprises of only solid elements, while another model is created with purely beam elements. The beam elements model is used for optimization studies whose objective is to reduce the shocks within the vehicle, due to mine blast while maintaining its overall structural integrity. The thickness of the rubberized shock mitigation layer at the joints of the space frame is varied during the optimization process. The optimization problem is solved using the Successive Heuristic Quadratic Approximation (SHQA) algorithm, which combines successive quadratic approximation with an adaptive random search while varying the bounds of the search space. The entire optimization process is carried out within the MATLAB environment. The results show that a significant reduction in the shock can be achieved using this approach.

scholarly journals Aeroelastic Wing Planform Design Optimization of a Flutter UAV Demonstrator

Aerospace ◽  
2020 ◽  
Vol 7 (4) ◽  
pp. 45
Author(s):  
Andreas Hermanutz ◽  
Mirko Hornung
Keyword(s):  
Design Optimization ◽  
Optimization Problem ◽  
Structural Integrity ◽  
Pareto Frontier ◽  
Low Frequency ◽  
New Approach ◽  
Flutter Suppression ◽  
Convex Problems ◽  
Active Flutter Suppression ◽  
Operational Aspects

In this work, a study to design a highly flexible flutter demonstrator for the development and testing of active flutter suppression is presented. Based on the UAV mission, a bi-objective design optimization problem can be formulated. The aeroelastic UAV characteristic and imposed constraints, defined by operational aspects and the structural integrity are described by surrogate modeling. Within the framework of the multi-criteria optimization, an approach to construct the equally spaced Pareto frontier with a new approach for non-convex problems is presented. An efficient Pareto configuration to meet a natural low speed and low frequency is identified and its main influencing design features are analyzed.

Shape Memory Polymer With Aluminum Tube Reinforced Impact Resistant Sandwich Core

2012 ◽  
Author(s):  
Gefu Ji ◽  
Guoqiang Li ◽  
Su-Seng Pang
Keyword(s):  
Shape Memory ◽  
Structural Integrity ◽  
Safety Concern ◽  
Shape Memory Polymer ◽  
Sandwich Panels ◽  
Low Velocity ◽  
The Core ◽  
Sandwich Construction ◽  
Structural Applications ◽  
Sandwich Core

Sandwich construction has been extensively used in various fields. However, sandwich panels have not been fully exploited in critical structural applications due to damage tolerance and safety concern. A major problem of sandwich panels is the debonding at or near the core/face sheet interface, especially under impact loading, which can lead to a sudden loss of structural integrity and cause catastrophic consequences. In order to improve the debonding resistance and energy absorption of sandwich panel under impact loadings, a new sandwich core is proposed which is a hybrid core consisting of hollow metallic millitubes reinforced Shape Memory Polymer matrix. The objective of this study was to characterize its dynamic performances. The core consisted of programmed shape memory polymer resin. Low velocity (4m/s) impact tests demonstrated that new core panel may be considered a promising option for critical structural applications featured by debonding and multiple impact tolerance.

A Marine Turbocharger Compressor Multi-Point 3D Design Optimization Tool

2021 ◽  
Author(s):  
Konstantinos Ntonas ◽  
Nikolaos Aretakis ◽  
Konstantinos Mathioudakis
Keyword(s):  
Diesel Engine ◽  
Design Optimization ◽  
Structural Integrity ◽  
Engine Performance ◽  
Design Tool ◽  
Optimization Process ◽  
3D Design ◽  
Element Analysis ◽  
Turbocharged Diesel Engine ◽  
Compressor Design

Abstract A marine turbocharger 3D compressor design tool, implemented on an existing marine turbocharger retrofit platform is presented. It produces 3D centrifugal compressor geometry for optimal compressor retrofit. It encompasses two modules, allowing the design process to become fully automatic. First, a 1D compressor multi-point design optimization process is carried out, aiming to provide a fast and reliable solution based on Turbocharged diesel Engine range of operation. Structural integrity is ensured by using simplified structural analysis. Dimensionless parameters are used as optimization variables, for a given nominal compressor mass flow and power. Then a CFD compressor multi-point design optimization process is carried out, producing optimized 3D compressor geometry. It complies with the Turbocharged diesel Engine range of operation, while structural integrity is ensured by using Finite Element analysis. A turbocharger compressor design case study is presented. First, a turbocharger 1D compressor design is carried out, aiming to at least reconstituting the original diesel engine performance. This first module provides a reliable compressor initial geometry for the 3D design module. A fully 3D compressor design is then performed, using a CFD-FEA optimization process, in order to provide an improved retrofitting solution. Comparison between the multi-point and the traditional one-point design method, shows that the multi-point method provides a wider SFC reduction in the range that the Diesel engine normally operates.

Optimum design of a lightweight mirror using aluminum foam or honeycomb sandwich construction: a case study for the GLAS telescope

2000 ◽  
Author(s):  
Shelly B. Conkey ◽  
Chiachung Lee ◽  
Stephen P. Chaykovsky ◽  
David A. Content ◽  
Armando Morrell ◽  
...  
Keyword(s):  
Optimum Design ◽  
Aluminum Foam ◽  
Sandwich Construction ◽  
Honeycomb Sandwich

Design Optimisation and Life Estimation of Split Hub Geometry of FSAE Car

2016 ◽  
Author(s):  
Suraj Raju ◽  
Pavan Kumar Asu Vijaya ◽  
Varun S. Kumar ◽  
Nikhil Manjunath ◽  
Harish Nagaraj
Keyword(s):  
Design Optimization ◽  
Structural Integrity ◽  
Bending Strength ◽  
Crack Nucleation ◽  
Low Cycle Fatigue ◽  
Contact Region ◽  
Screening Method ◽  
Optimization Methods ◽  
Element Analysis ◽  
Machine Elements

Hub in the car faces high vibrations and centrifugal stresses. This calls for proper design and analysis. The life cycle of any formula car should be less which is adequate for racing purpose. This work is focused in analyzing low cycle fatigue and conducting vibratory analysis of a split hub of FSAE car. Stress concentration factor is significant in machine elements which give rise to localized stresses for any change in design of surface or abrupt change in cross section. This member acts as stress riser which leads to localized stresses in turn leading to peak stresses introducing cracks. These cracks may propagate and leads to catastrophic failure of machine elements and these conditions leads to fatigue analysis to calculate life. Two approaches are employed here. Based on linear elastic finite element analysis Neuber stresses are calculated from fictive elastic results. Strain Amplitude approach is followed by Coffin-Manson equation to determine Fatigue life. The failure induced by fretting fatigue due to two contact surfaces subjected to an oscillatory loading serves as premature crack nucleation which will gradually become a prominent issue during the running of car. In some cases it reduces the life due to micro slip at the edge of contact. The split pieces of hub talk to each other and create wear which is calculated by fretting. These rotary parts call for structurally rigid geometry. Modes with relatively high mode participation factor can be readily excited by the base vibrations. Vibratory stresses arise due to engine and rotating wheels acts like excitation frequencies which may lead to possible resonance. Campbell diagram is effectively used to modify the stiffness in turn design. Also an approach is done for design optimization of fillet stresses at Sharp edges caused due to bending strength of the split pieces. Optimization of diameter, contact region, root land dimensions is done to ensure stress distribution is uniformly spread along the fillet radius on both pieces of hub which otherwise may lead to crack initiation considering all peak stresses. Design of Experiments technique and optimization methods are used to improve structural integrity by finding the peak sectional stress. Design optimization is done using screening method to ensure strength of material.

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