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Aerospace & Defense Technology: December 2019

  • Magazine Issue
  • 19AERP12
Published 2019-11-28 by SAE International in United States
Engineered Solutions for Enclosure Sealing and InsulationTips for Reducing Error When Using Eddy Current Measuring TechniquesReducing the High Cost of TitaniumStreamlining Post-Processing in Additive ManufacturingSoftware-Defined Analog Filters: A Paradigm Shift in Radio Filter Performance and CapabilitySDR Interface for the NeXtRAD Multistatic Radar SystemElectrodeposition of Metal Matrix Composites and Materials Characterization for Thin-Film Solar Cells Metal matrix composites, which consist of silver-multiwalled carbon nanotube-silver, layer-by-layer stacks, can electrically bridge the cracks (>40 μm) that appear in semiconductor substrates and the composite grid lines.Sensing Applied Load and Damage Effects in Composites with Nondestructive Techniques Comparing and correlating piezoelectrically induced guided waves, acoustic emission, thermography, and X-ray imaging to determine the effects of applied load on a composite structure.Technology Impact Forecasting for Multi-Functional Composites Multi-functional composites offer a possible solution to the conflicting design goals of making new aircraft lighter, stronger, faster, and more environmentally sustainable.Molecular Engineering for Mechanically Resilient and Stretchable Electronic Polymers and Composites Establishing the design criteria for elasticity and ductility in conjugated polymers and composites by analysis of the structural determinants of the mechanical…
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Toughening Stretchable Fibers Using a Metallic Core

  • Magazine Article
  • TBMG-35438
Published 2019-11-01 by Tech Briefs Media Group in United States

Researchers have developed a fiber that combines the elasticity of rubber with the strength of a metal, resulting in a tougher material. The fibers consist of a gallium metal core surrounded by an elastic polymer sheath. When placed under stress, the fiber has the strength of the metal core. But when the metal breaks, the fiber doesn’t fail. Instead, the polymer sheath absorbs the strain between the breaks in the metal and transfers the stress back to the metal core. This response is similar to the way human tissue holds together broken bones.

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Characterization of Areca and Tamarind Fiber Reinforced Hybrid Polymer Composites for Structural Applications

Sree Vidyanikethan Engineering College-Binoj Joseph Selvi, Manikandan Natarajan, Bhanu Prakash Palampalle
Published 2019-10-11 by SAE International in United States
Recently, owing to the noteworthy properties like biodegradable, low cost, readily available, easy processing, less toxic and eco-friendly nature natural fibers reinforced composites are used in different engineering applications. Nevertheless, the traditionally used synthetic E-glass fiber composite shows inverse features than that of reported natural fiber composites. Hence, in the current investigation discarded areca and tamarind fibers was collected, extracted and characterized for its overall performance and to implement it as a better alternative for artificial fiber composites. Composite coupons were made with different magnitudes of fiber/matrix and inspected for their potentiality by exploring its mechanical and thermal assets as per standard techniques. The developed areca and tamarind hybrid composite results shown better part than their individual composites and also in par with the prevailing synthetic fiber products. Hence, the tested results shown that the fabricated hybrid composites exhibits better specific properties and ensures its potentiality for aerospace and automotive applications.
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Application of Response Surface Method to Optimize Waterjet Cutting Process Parameter of Glass Fiber Reinforced Polymer Matrix Laminates

VIT-Savitoj Singh Aulakh, Dhanush Patil, Renold Elsen, Sangeet Aggarwal
Published 2019-10-11 by SAE International in United States
Waterjet machining is a widely used advanced machining technique because of its versatility in removal of material for a wider range of materials. Waterjet machining is particularly advantageous in the precise cutting of advanced materials like Fiber Reinforced Polymers (FRPs) comparative to conventional machining methods. The conventional machining methods result in the release of high amount of glass fiber dust which leaves the work environment unsafe for the workers. The material dust if inhaled can lead to acute respiratory diseases. In this work an analysis was done on the cutting performance of Waterjet machining and is presented based on an experimental investigation on fabricated fiberglass reinforced laminates. It is shown that with a good combination of cutting parameters such as nozzle traverse speed, waterjet pressure, and Stand-off distance a cutting performance can be achieved. Plausible trends of kerf quality and machining time with respect to the waterjet pressure, nozzle traverse speed and nozzle stand-off distance are analysed. The surface roughness and machining time has been optimized using DOE techniques for achieving proper machining characteristics and…
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Banana Stem Based Activated Carbon as Filler in Polymer Composites for Automobile Applications

Hindustan Institute of Tech. and Science-John Presin Kumar Ayyaswamy, Sivakumar Sattanathan, Balaji Ramachandran, Mukesh Nadarajan
Published 2019-10-11 by SAE International in United States
Activated carbon was produced from a new part of banana plant namely true stem in this current research and used as fillers in polymer composites for automobile application. True stems of banana plants are the main wastes in banana or fruit markets which refer to the remains after banana fruits are removed from the supporting stems. Conversion of raw material into activated carbon particles is done by chemical and heat activation. The raw material used here were dried samples of banana plant’s true stem. This material was heated in a crucible at 400°C and then powdered. These crushed samples were activated using hydrochloric acid at 120°C for 5 hours and finally in a furnace for thermal activation at 700oC for 1 hour. These particles were incorporated as fillers in composites at Proportions of 15%, 25%, 35% and 45%. The activated carbon samples have been characterized by determining its fixed carbon content and bulk density. Scanning electron microscopy was done to analyze the morphology of particles. Mechanical tests were conducted for tensile strength, flexural strength and…
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Development and Investigation of Jute/Linen Fibre Reinforced Polymer Composite

BSA Crescent Institute of Science & Technology-Arvinda Pandian, Siddhi Jailani
Published 2019-10-11 by SAE International in United States
In recent automotive era, natural fibre reinforced with thermoset polymer composites have been incorporated by automotive industries especially for interiors, car body panels, dashboards, headliners etc. Natural fibres offer many affirmative qualities such as less weight and cost, especially in reduction of carbon di-oxide which is a major threat to the planet from the automotive sectors. The current work deals with the study of the potential usage of mineral powder (industrial by-product) in polymer. In this paper, hybrid composites with natural fabrics reinforcements and mineral powder as filler to matrix material are developed. The mineral powder used as filler is silica fumes which is a by-product of industries. The hand lay-up methodology is employed to fabricate the composite. The composites with and without mineral filler material are developed. The mechanical properties of the composites are assessed. The mechanical properties of composites with and without mineral filler are compared and their result shows that with addition of filler material, the mechanical properties of the composites are affected. Results disclose that loading of silica fumes increases the…
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Exploration of Dry Sliding Wear Behaviour of Sisal Fiber Reinforced Cashew Nut Shell Liquid and Epoxy Polymer Matrix Composite as an Alternative Friction Material in Automobiles

Sri Krishna College of Engg. and Tech.-Soundararajan Ranganathan, Shanthosh Gopal, Tharunkumar Magudeeswaran, Ramamoorthi Rangasamy
Published 2019-10-11 by SAE International in United States
The brake pad is one of the foremost imperative parts of the vehicle. Due to the environmental requirement, natural materials were the alternate source for products manufacturing. The product composite made by using hot press techniques with mixing ingredients such as natural fiber (treated sisal), cashew nut filler, graphite and alumina with resin (cashew nut shell liquid - CNSL and epoxy). Two formulas and four samples of each set were composed by varying the resin type of CNSL and epoxy and prepared the test samples with attaining better hardness. The main intern of this proposed effort is to appraise the wear in dry sliding and performance of friction of the prepared composites. The composites are taken for tribo test by varying the load of 10,20,30,40 N and sliding distance of 1000, 2000 m respectively. Experiments were performed at stated process parametric conditions to record the responses. The result shows that the CNSL resin composites specific wear resistance and frictional coefficients are found better than epoxy resin composites. The addition of filler element cashew nut shell…
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Rectangular Cross Section Polymeric Sealing Rings

Automatic Transmission and Transaxle Committee
  • Ground Vehicle Standard
  • J2310_201910
  • Current
Published 2019-10-09 by SAE International in United States
The purpose of this SAE Recommended Practice is to establish guidelines for the automatic transmission and hydraulic systems engineer to design rectangular cross section seals for rotating and static grooved shaft applications. Also included are property comparisons of polymeric materials suitable for these applications. Historically, material covered in this document is not intended to include aluminum contact applications.
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Lateral Kevlar Suspension Device (LKSD)

  • Magazine Article
  • TBMG-35258
Published 2019-10-01 by Tech Briefs Media Group in United States

The Lateral Kevlar Suspension Device (LKSD) is made up of a support ring that has three spring-loaded tension assemblies equally spaced around the support ring. Connected to these tension assemblies is a band that supports a separate ring capable of holding a cylindrical shaped load.

Hydrogel Fights Orthopedic Bone Infections

  • Magazine Article
  • TBMG-35329
Published 2019-10-01 by Tech Briefs Media Group in United States

Researchers have a developed a double-duty hydrogel that both attacks the bacteria and encourages bone regrowth with a single application containing two active components.