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Asokan, R.
- Experimental Investigation of Failure Mechanisms in GFRP Lap Joint Using Acoustic Emission
Abstract Views :230 |
PDF Views:2
Authors
Affiliations
1 Aeronautical Engineering Department, Hindustan University, Chennai, IN
2 Aeronautical Engineering Department, Madras Institute of Technology, Anna University, Chennai, IN
1 Aeronautical Engineering Department, Hindustan University, Chennai, IN
2 Aeronautical Engineering Department, Madras Institute of Technology, Anna University, Chennai, IN
Source
International Journal of Vehicle Structures and Systems, Vol 4, No 2 (2012), Pagination: 48-51Abstract
In this paper, Acoustic Emission (AE) based damage mode identification of Glass Fibre Reinforced Plastic (GFRP) lap joints is detailed using laboratory scale experiments. Bonded single lap joint specimens are fabricated from GFRP laminates. These specimens are subjected to tensile test with on-line AE monitoring. The study of failure mechanisms is facilitated by the choice of different oriented lap joint specimens in which one or two such mechanisms predominate. Range of peak frequencies in each orientation is investigated using frequency analysis. Fast Fourier Transforms enabled calculating the frequency content of each damage mechanism. Parametric plots are used to discriminate the different stages of occurrence of failure mechanism in lap joints. Results have shown that predominate of failure modes in each orientation is used as a key in the study of discrimination of failure modes from AE data in lap joints.Keywords
Composites, GFRP, Lap Joint, Acoustic Emission, Failure Modes.
- Performance Analysis of Quality of Service Enabled Temporally Ordered Routing Algorithm Using Ant Colony Optimization in Mobile Ad Hoc Networks
Abstract Views :241 |
PDF Views:2
Authors
R. Asokan
1,
A. M. Natarajan
2
Affiliations
1 Electronics and Communication Engineering Department, Kongu Engineering College, Perundurai, Erode, Tamilnadu, IN
2 Bannari Amman Institute of Technology, Sathiyamangalam, Tamilnadu, IN
1 Electronics and Communication Engineering Department, Kongu Engineering College, Perundurai, Erode, Tamilnadu, IN
2 Bannari Amman Institute of Technology, Sathiyamangalam, Tamilnadu, IN
Source
Journal of Advances in Engineering Sciences, Vol 2, No 1 (2009), Pagination: 11-18Abstract
Mobile Ad hoc NETworks (MANETs) are collection of mobile hosts dynamically forming a temporary network without the aid of any existing infrastructure or centralized control. Quality of Service (QoS) support for MANET is a challenging task due to the dynamic topology and limited resources. Routing in MANET depends on intermediate nodes. The existing QoS based routing solutions for MANET involves with single metric or two metrics. It is important that MANETs should provide QoS support routing such as acceptable delay, jitter and energy in case of multimedia and real time applications. The metrics selection can be from additive or multiplicative or concave or combination of the above. This paper proposes a QoS enabled Temporally Ordered Routing Algorithm (TORA) protocol using Ant Colony Optimization (ACO) called AntTORA. ACO technique is used in this protocol to optimize multiple QoS routing metrics like delay, jitter and energy. Ant-like agents are used in this algorithm to discover and maintain paths with the specified QoS requirements. The performance of TORA and AntTORA are analyzed using network simulator-2. AntTORA produces better performance than TORA in the terms of end-to-end delay, energy, jitter and throughput.Keywords
Mobile Ad Hoc Network, Routing, QoS, TORA and AntTORA.- Cytochrome P450 Isoforms Transcriptional, Larval Growth and Development Responses to Host Allelochemicals in the Generalist Herbivore, Helicoverpa armigera (Hubner) (Lepidoptera:Noctuidae)
Abstract Views :329 |
PDF Views:110
Authors
Affiliations
1 Division of Biotechnology, Indian Institute of Horticultural Research, Hesaraghatta Lake (PO), Bengaluru 560 089, IN
2 Department of Biotechnology, St Martin’s Engineering College, Dulapally, Secunderabad 500 014, IN
1 Division of Biotechnology, Indian Institute of Horticultural Research, Hesaraghatta Lake (PO), Bengaluru 560 089, IN
2 Department of Biotechnology, St Martin’s Engineering College, Dulapally, Secunderabad 500 014, IN
Source
Current Science, Vol 111, No 5 (2016), Pagination: 901-906Abstract
Helicoverpa armigera (Hubner) is a polyphagous pest causing severe yield loss in many important crops. Host plants produce allelochemicals to deter insect pests and in response, insects deploy cytochrome P450 monooxygenases (P450s) to detoxify allelochemicals. Understanding the response of P450s to allelochemical exposure is key to effective pest management. We studied the response of seven H. armigera P450 isoforms to different concentrations of three allelochemi-cals (gossypol, tomatine and xanthotoxin) and their effects on insect growth and survival. Allelochemicals strongly induced overexpression of some P450s. CYP6AE14 exhibited the highest overexpression in gossypol treatment. CYP6AE14 and CYP6B7 exhibited higher overexpression in xanthotoxin treatment and CYP6B7 showed the highest overexpression in tomatine treatment. Overall, CYP6AE14 and CYP6B7 were induced by all three allelochemicals. Higher (0.5 and 1.0 μg) concentrations of allelochemicals caused significant larval growth retardation. Interestingly, gossypol showed a hormetic effect, i.e. larval weight was approximately 10% higher at lower (0.025 μg) concentration. Highest larval mortality (53%) was observed in tomatine treatment. These findings would help in identifying suitable P450 isoforms in the management of H. armigera.Keywords
Allelochemicals, Cytochrome P450 Isoforms, Helicoverpa armigera, Pest Management, Real-Time PCR.Full Text
- Effect of Intra-Ply Hybridization of Carbon-Aramid/Epoxy Laminates under Tension-Tension Fatigue Loading
Abstract Views :286 |
PDF Views:141
Authors
Affiliations
1 School of Aeronautical Sci., Hindustan Institute of Tech. and Sci., Chennai, IN
1 School of Aeronautical Sci., Hindustan Institute of Tech. and Sci., Chennai, IN
Source
International Journal of Vehicle Structures and Systems, Vol 10, No 6 (2018), Pagination: 384-388Abstract
The objective of the research is to investigate the fatigue life of intra-ply hybrid Carbon-Aramid laminate with Epoxy resin in on-axis and off-axis directions. Three different off-axis angles of 15°, 30° and 45° were considered for the present work. The intra-ply hybridization is used to combine the superior mechanical properties of Carbon fibre with excellent elongation-to-failure property of Aramid fibre in the same lamina. The fatigue test was performed using load control using a frequency of 5Hz. The fatigue behaviour was studied for Carbon/Epoxy, Aramid/Epoxy, Carbon-Aramid/Epoxy, Carbon-Aramid/Epoxy - 15°, Carbon-Aramid/Epoxy - 30° and Carbon-Aramid/Epoxy - 45° with the stress ratio of R = 0.1. The ultimate tensile strength decreases progressively for Carbon/Epoxy, Carbon-Aramid/Epoxy, Aramid/Epoxy, Carbon-Aramid/Epoxy - 15°, Carbon-Aramid/Epoxy - 30° and Carbon-Aramid/Epoxy - 45°. The effect of off-axis loading indicates that the increase of fibre angle influences the decrease in tensile strength and fatigue life.Keywords
Lamina, Carbon-Aramid Reinforced Epoxy, Interlaced, Fatigue Life, Intra-Ply.Full Text
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