Carbon Fiber Composites: A Solution for Light Weight Dynamic Components of AFVs

2017 ◽  
Vol 67 (4) ◽  
pp. 420 ◽  
Author(s):  
Subodh Kumar Nirala ◽  
Sarath Shankar ◽  
Dhanalakshmi Sathishkumar ◽  
V. Kavivalluvan ◽  
P. Sivakumar
Keyword(s):  
Composite Material ◽  
Composite Materials ◽  
Structural Integrity ◽  
Traditional Approach ◽  
Load Test ◽  
Carbon Fiber Composites ◽  
Light Weight ◽  
Static Load Test ◽  
Element Analysis ◽  
Specific Strength

<p class="p1">Changing circumstances across the world require armored fighting vehicle (AFV) of a country to be more agile, easily manoeuverable and transportable besides other key requirements like firepower and protection. Therefore, the AFV should be as light as possible. The use of conventional materials and techniques do not fulfill the requirement of light weight AFV. The composite materials having high specific modulus, specific strength and directional properties are the alternative substitution for reducing the weight. A customized design approach with proper selection of composite material is essential to make AFV components with required properties at lower weight as compared to the traditional approach. Special properties like resistance to moisture, solvents, UV degradation etc. could be imparted to the composite components by the use of proper additives or fillers. This paper deals with the development of dynamic members like road wheel, top roller and axle arm, whose count is always more in any AFVs, using carbon-epoxy composite material. The details of composite materials used and the manufacturing processes adopted are briefly discussed. The static load test carried out to assess the structural integrity as well as non-destructive tests (NDT) performed to detect the defects are also dealt in detail. Preliminary Finite Element Analysis and Multi-body Dynamic Analysis have also been discussed. These analyses have been done mainly to understand the sustainability and performance of the components developed under the given loading conditions.</p>

Stress Distribution Behavior of Spherical Plain Bearing Fabricated by TiAl-Based Composite Materials Based on the Finite Element Analysis

2014 ◽  
Vol 1061-1062 ◽  
pp. 649-652
Author(s):  
Jing Wang ◽  
Li Ying Yang ◽  
Shou Ren Wang ◽  
Guang Ji Xue ◽  
Chang Xiu Zhou
Keyword(s):  
Finite Element ◽  
Composite Material ◽  
Composite Materials ◽  
Bearing Steel ◽  
Plain Bearing ◽  
Element Analysis ◽  
Specific Strength ◽  
Finite Element Software ◽  
The Finite Element Analysis ◽  
Spherical Plain Bearing

Spherical plain bearing is a sliding bearing have a spherical contact surface,it can bear larger load and automatically adjusted to the self-alignin. TiAl-based composite material is a material that be used to lightweight spherical plain bearing. The Simulation used the finite element software Ansys for the bearing’s static analysis.The material of outer ring using normal bearing steel, one group used the TiAl-based composite materials as the material of the inner ring, Another group the inner ring material is bearing steel 9Cr18. The law of the stress and strain produced by the two groups is consistent,the deformation of the composite materials is bigger under the same load, its elasticity modulus and density is smaller compared to the ordinary bearing steel,the composite material has the advantages of high specific strength especially in the occasions have strict requirements of the bearing weight.

scholarly journals Environmental degradation of composites for marine structures: new materials and new applications

2016 ◽  
Vol 374 (2071) ◽  
pp. 20150272 ◽  
Author(s):  
Peter Davies
Keyword(s):  
Composite Materials ◽  
Test Data ◽  
Environmental Degradation ◽  
Structural Integrity ◽  
Mechanical Test ◽  
Traditional Approach ◽  
Essential Element ◽  
Structural Testing ◽  
Marine Structures

This paper describes the influence of seawater ageing on composites used in a range of marine structures, from boats to tidal turbines. Accounting for environmental degradation is an essential element in the multi-scale modelling of composite materials but it requires reliable test data input. The traditional approach to account for ageing effects, based on testing samples after immersion for different periods, is evolving towards coupled studies involving strong interactions between water diffusion and mechanical loading. These can provide a more realistic estimation of long-term behaviour but still require some form of acceleration if useful data, for 20 year lifetimes or more, are to be obtained in a reasonable time. In order to validate extrapolations from short to long times, it is essential to understand the degradation mechanisms, so both physico-chemical and mechanical test data are required. Examples of results from some current studies on more environmentally friendly materials including bio-sourced composites will be described first. Then a case study for renewable marine energy applications will be discussed. In both cases, studies were performed first on coupons at the material level, then during structural testing and analysis of large components, in order to evaluate their long-term behaviour. This article is part of the themed issue ‘Multiscale modelling of the structural integrity of composite materials’.

scholarly journals Experimental Study on Mechanical Property of Stiffening-ribbed-hollowpipe Reinforced Concrete Girderless Floor with Four Clamped Edges Supported

2013 ◽  
Vol 7 (1) ◽  
pp. 170-178 ◽  
Author(s):  
Weijun Yang ◽  
Yongda Yang ◽  
Jihua Yin ◽  
Yushuang Ni
Keyword(s):  
Mechanical Property ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Reinforced Concrete ◽  
Large Scale ◽  
Load Test ◽  
Static Load Test ◽  
Loading Test ◽  
Element Analysis ◽  
Clamped Edges

In order to study the basic mechanical property of cast-in-place stiffening-ribbed-hollow-pipe reinforced concrete girderless floor, and similarities and differences of the structural performance compared with traditional floor, we carried out the destructive stage loading test on the short-term load test of floor model with four clamped edges supported in large scale, and conducted the long-term static load test. Also, the thesis conducted finite element analysis in virtue of ANSYS software for solid slab floor, stiffening-ribbed-hollow-pipe floor and tubular floor. The experiment indicates that the developing process of cracks, distribution and failure mode in stiffening-ribbed-hollow-pipe floor are similar to that of solid girderless floor, and that this kind of floor has higher bearing capacity and better plastic deformation capacity. The finite element analysis manifests that, compared with solid slab floor, the deadweight of stiffening-ribbed-hollow-pipe floor decreases on greater level while deformation increases little, and that compared with tubular floor, this floor has higher rigidity. So stiffening-ribbed-hollow-pipe reinforced concrete girderless floor is particularly suitable for long-span and large-bay building structure.

scholarly journals Load Carrying and Hydrostatic Performances of Innovative Encapsulated Anchorage System for Unbonded Single Strand

2019 ◽  
Vol 2019 ◽  
pp. 1-16
Author(s):  
Min Sook Kim ◽  
Young Hak Lee
Keyword(s):  
Stress Concentration ◽  
Transfer Test ◽  
Load Transfer ◽  
Maximum Load ◽  
Load Test ◽  
Static Load Test ◽  
Element Analysis ◽  
Bearing Plate ◽  
Anchorage System ◽  
Load Carrying

A new anchorage system is proposed having a circular bearing plate and curvature between the bearing plate and the anchor head to improve stress concentration. A lid with a screw instead of the grouting method is also proposed to prevent moisture penetration. The details of the anchorage device have been chosen to reduce stress concentration based on the finite element analysis. Static load test, load transfer test, and hydrostatic test of fabricated devices were carried out according to ETAG 013 to evaluate the proposed design. As results, the anchorage slip and stabilization satisfied the recommendations of ETAG 013. The maximum load in the load transfer test was at least 1.1 times the ultimate tendon strength. The results of the hydrostatic test showed that the developed anchorage device is watertight to protect against corrosion. As a result of bursting force test, it was confirmed that the proposed anchorage device has more advantages than the conventional rectangular anchorage devices in terms of stress distribution.

Damage Assessment Analysis of Composite Pressure Vessels Subjected to Random Impact Loading

1989 ◽  
Vol 111 (2) ◽  
pp. 124-129 ◽  
Author(s):  
M. Yener ◽  
E. Wolcott
Keyword(s):  
Composite Materials ◽  
Impact Damage ◽  
Progressive Failure ◽  
High Strength ◽  
Pressure Vessels ◽  
Carbon Fiber Composites ◽  
Low Velocity ◽  
Element Analysis ◽  
Static Loads ◽  
Energy Impact

At the present time, advanced composites have been widely accepted as engineering materials. Analysis techniques for the response of composite materials and structures to static loads are reasonably well established. Because of their light weight, high modulus, high strength, and good fatigue resistance, carbon fiber composites have been used successfully in the aircraft industry and rocket motor cases. However, composite materials are very susceptible to low velocity and low energy impact damage. Recently, the damage inflicted by such impact has been a subject of great interest. This paper primarily illustrates that it is possible to quantitatively assess damage due to any type of unexpected loading, including impact, using progressive failure finite element analysis.

scholarly journals Study of stability loss of cylindrical shell made of composite material

2021 ◽  
Vol 18 (3) ◽  
pp. 342-350
Author(s):  
L. A. Adegova ◽  
M. V. Bobrysheva ◽  
A. E. Scherbinina
Keyword(s):  
Cylindrical Shell ◽  
Composite Material ◽  
Composite Materials ◽  
Compressive Load ◽  
Stability Loss ◽  
Critical Force ◽  
Transport Infrastructure ◽  
Element Analysis ◽  
Force Ratio ◽  
Analysis Package

Introduction. Composite materials are used in the construction of transport infrastructure facilities, buildings and structures for various purposes, in housing and communal services. Calculation of structures made of composite materials is used in the field of stress-strain state, buckling, analysis of material under tension, the effect of cracks on the state of these structures. The main properties of composite materials and a method of manufacturing a cylindrical shell structure from a composite material are considered. The total number of winding options is calculated using the combinatorial method.Materials and methods. A composite cylindrical shell with a radius of R = 300 mm and a height of H = 600 mm was chosen as the object of research. The creation of a model of a cylindrical shell in a finite element analysis package is described. An axial compressive load acting on the shell with a force of F = 100 kN is specified. Determination of the critical force ratio.Results. The results of the analysis of the loss of stability of the cylindrical shell are obtained and the graphs of the dependence of the critical force on the options for laying the layers are presented. Depending on the magnitude of the critical force and the form of buckling, the most and least favorable options for laying layers in a composite material package have been determined.Discussion and conclusions. A conclusion is made of the dependence of the critical force on the combination of stacking layers in the composite.

scholarly journals Design and Experimental Investigation of Composite Automotive Drive Shaft

2021 ◽  
Vol 9 (10) ◽  
pp. 1088-1094
Author(s):  
Akshay Dudam
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Composite Materials ◽  
Natural Frequency ◽  
Power Transmission ◽  
Drive Shaft ◽  
Torsional Buckling ◽  
Element Analysis ◽  
High Rotational Speed ◽  
Specific Strength

Abstract: Replacing composite bodies by the conventional metallic bodies have many advantages because of high specific strength and high specific stiffness of the composite materials. As compared to the conventional drive shafts, Composite drive shafts have the potential of lighter and longer life with high rotational speed. Nowadays drive shafts are used in two pieces. However, the main advantage of the current design is that only one piece of composite drive shaft is possible that fulfils all the drive shaft requirements. The torsional strength, torsional buckling and bending natural frequency are the main basic requirements considered here. This work is all about the replacing the conventional two-piece steel drive shaft with a one-piece carbon/epoxy. Design of composite drive shaft Classical Lamination Theory is used for the design of composite drive shaft. Finite element analysis (FEA) was used to design composite drive shafts incorporating carbon within an epoxy matrix. From experimental results, it was found that the developed one-piece automotive composite drive shaft had 64% mass reduction, 74% increase in torque capability compared with a conventional two-piece steel drive shaft. It also had 6380 rpm of natural frequency which was higher than the design specification of 3050 rpm. Index Terms: Bending frequency, Composite Materials, Drive shaft, Finite Element Analysis (FEA), Power transmission, Torsion, Torsional buckling.

Advanced Conductive Composite Materials for Spacecraft Application

2010 ◽  
Vol 123-125 ◽  
pp. 7-10
Author(s):  
Ho Sung Lee
Keyword(s):  
Thermal Conductivity ◽  
Composite Material ◽  
Composite Materials ◽  
Carbon Fiber ◽  
High Performance ◽  
Thermal Stresses ◽  
Thermal Design ◽  
High Thermal Conductivity ◽  
Carbon Fiber Composites ◽  
Advanced Composite

In this study, thermal responses of advanced fiber/epoxy matrix composite materials are considered for spacecraft thermal design. These thermal responses are important, because the localized thermal behavior from applied heat loads can induce thermal stresses, which can lead to functional failure of the spacecraft system. Since most of polymer matrices exhibit relatively poor thermal conductivity, the composite materials have been widely considered only for structural application and little for thermal application. However, recently pitch-based high performance carbon fiber becomes available and this fiber shows high thermal conductivity. Because of this combination of low CTE and high thermal conductivity, continuous carbon fiber composites make them suitable for thermal management of spacecraft. The advanced composite material is composed of a continuous high modulus pitch based fiber (YS90A) and DGEBA epoxy resin(RS3232). It was demonstrated that advanced composite material satisfied thermal requirement for a lightweight thermal radiator for heat rejection of communication satellite.

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