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Viewing 1 to 30 of 3417
2016-04-05
Journal Article
2016-01-0497
Brian Falzon, Wei Tan
Abstract The development of the latest generation of wide-body carbon-fibre composite passenger aircraft has heralded a new era in the utilisation of these materials. The premise of superior specific strength and stiffness, corrosion and fatigue resistance, is tempered by high development costs, slow production rates and lengthy and expensive certification programmes. Substantial effort is currently being directed towards the development of new modelling and simulation tools, at all levels of the development cycle, to mitigate these shortcomings. One of the primary challenges is to reduce the extent of physical testing, in the certification process, by adopting a ‘certification by simulation’ approach. In essence, this aspirational objective requires the ability to reliably predict the evolution and progression of damage in composites. The aerospace industry has been at the forefront of developing advanced composites modelling tools.
2016-01-05
Journal Article
2015-01-9086
Geethanjali Gadamchetty, Abhijeet Pandey, Majnoo Gawture
The three parameter Ramberg-Osgood (RO) method finds popular usage for extracting complete stress-strain curve from limited data which is usually available. The currently popular practice of assuming the plasticity to set in only at the Yield point provides computational advantage by separating the complete nonlinear curve, obtained from RO method, into elastic and plastic regions. It is shown, with an example problem, that serious errors are committed by using this method if one compares the obtained results with results of complete stress-strain curve. In the present work we propose a simple Taylor series based approach based on RO method to overcome the above deficiency. This method is found to be computationally efficient. The proposed method is applicable for stress-strain curves of materials for which RO method provides a good approximation.
2008-04-14
Journal Article
2008-01-0545
Sayed A. Nassar, Xianjie Yang, Saravanan Ganeshmuthy
In this paper, an emphasis is put on describing the elastic and plastic deformation behavior of the bolted joint. The bolt material is assumed to be plastic hardening. A nonlinear combined stress model is established for a typical bolted joint for the purpose of studying its behavior under a yield tightening. The combined effect of axial and torsional stresses in the tightened threaded fastener is considered. A new approach for yield tightening under ideal plastic bolt was proposed, and the effects of the thread and bearing frictional coefficients on the clamp load prediction are evaluated. The prediction precision of deformation behavior of the bolted joint under yield tightening for the strain hardening bolt material are studied experimentally.
2010-09-01
Magazine
New resins, new attributes The past decade has seen an explosion of new engineering plastics that have, inch by inch, penetrated into tougher and tougher aerospace applications.
2012-06-13
Magazine
The big boys go for plastic While it is true that the latest developments in advanced alloy manufacturing techniques can deliver structures and components that meet all the product requirements that aerospace primes need for new aircraft, there can be no escaping the fact that there is now an unstoppable momentum building up for the plastic airplane.
2012-08-31
Magazine
ETS Baja parts failure analysis: Geared for success When the ETS Baja team had to withdraw from the Baja Auburn 2012 event due to abnormal gear failure, an extensive analysis was required to ensure that problems of this nature would not surface again. After some serious investigation, the conclusion of almost 30 hours of research was unexpected and proved surprisingly simple. Body and soul rule at 2012 Formula SAE Months before the Formula SAE Michigan competition in May, teams were hashing out product development decisions. The end-game was presenting a racecar that had the right stuff for earning high points in the challenge's vehicle design evaluation as well as the acceleration, skid pad, endurance, and autocross dynamic performance events.
2013-08-30
Magazine
Originality revs up Formula SAE Michigan teams More than 100 Formula SAE teams vied for top honors at the annual Michigan competition that spotlights one-of-a-kind open-wheel racecars designed and built by student engineers. American manufacturing in the hands of UNF students University of North Florida students design and build Formula vehicles for nationwide competition focused on challenging the minds of future engineers. Solar EV thunder down under Michigan is aiming for its first victory in next month's 2013 World Solar Challenge with a new asymmetrical racecar that is ready for 1860 mi (2990 km) in the Australian sun. Solar Impulse Team's next challenge: to circle the globe The next world-girdling version of the fuel-less flier will rely on featherweight polymers and composites.
2014-01-29
WIP Standard
AIR6292
The SAE Aerospace Information Report (AIR) is intended to be used as a process verification guide for evaluating implementation of key factors in bonded repair of fiber reinforced composite structure in a repair shop environment. The guide will be used in conjunction with a regulatory approved and substantiated repair, and is intended to promote consistency and reliability.
2010-01-01
Book
Joel Fried
This review report gives an overview of how polymers are used in aerospace applications. Some of the topics covered are composites, including thermosets, thermoplastics and nanocomposites; fiber reinforcement of composites; and specialized applications. For each type of composite, the chemistry, cure methods, fabrication methods, mechanical properties, thermal properties and environmental degradation are considered. From the applications’ perspective, the title discusses sealants, structural adhesives, foams, primer paint, shape memory alloys, electroactive devices, MEMS, vibration damping, NLO properties and ablative polymers. This review report is accompanied by approximately 400 abstracts compiled from the iSmithers Polymer Library, the largest dedicated resource of polymer information in the world, to facilitate further reading on this subject. A subject index and a company index are included.
CURRENT
1954-05-01
Standard
AMS3247
CURRENT
1954-05-01
Standard
AMS3245
CURRENT
1956-05-01
Standard
AMS3246
CURRENT
2011-08-25
Standard
AMS3271B
This specification covers a polychloroprene-coated, one side only, nylon knit in the form of cloth.
HISTORICAL
2011-08-25
Standard
AMS3271
This specification covers a polychloroprene-coated, one side only, nylon knit in the form of cloth.
HISTORICAL
2011-08-25
Standard
AMS3272
This specification and its supplementary detail specifications cover a woven nylon cloth coated with polyether (EU) urethane which is thermally, radio frequency, or ultrasonically sealable and having air holding characteristics.
HISTORICAL
1990-07-01
Standard
AMS3271A
This specification covers a polychloroprene−coated, one side only, nylon knit in the form of cloth.
HISTORICAL
1990-07-01
Standard
AMS3272A
This specification and its supplementary detail specifications cover a woven nylon cloth coated with polyether (EU) urethane.
CURRENT
2011-08-25
Standard
AMS3272B
This specification and its supplementary detail specifications cover a woven nylon cloth coated with polyether (EU) urethane.
HISTORICAL
1991-10-01
Standard
AMS3328
This specification covers a fluorosilicone (FVMQ) rubber in the form of sheet, strip, tubing, extrusions, and molded shapes.
HISTORICAL
1994-07-01
Standard
AMS3328A
This specification covers a fluorosilicone (FVMQ) rubber in the form of sheet, strip, tubing, extrusions, and molded shapes.
CURRENT
2016-04-19
Standard
AMS3328C
This specification covers a fluorosilicone (FVMQ) rubber in the form of sheet, strip, tubing, extrusions, and molded shapes. This specification is not recommended for use in the manufacture of O-rings, O-ring Cord, or Molded in Place gaskets. For the manufacture of O-rings, O-ring Cord, or Molded in Place gasketsthe use of AMS-R-25988, Type I, Class 1, Grade 40 is recommended.
HISTORICAL
2010-05-17
Standard
AMS3328B
This specification covers a fluorosilicone (FVMQ) rubber in the form of sheet, strip, tubing, extrusions, and molded shapes.
CURRENT
2014-05-08
Standard
AMS3323A
This specification covers a fluorosilicone (FVM) rubber sponge in the form of sheet, strip, extrusions, and molded shapes.
HISTORICAL
1990-01-01
Standard
AMS3323
This specification covers a fluorosilicone (FVM) rubber sponge in the form of sheet, strip, extrusions, and molded shapes.
2016-04-27
WIP Standard
AMS3316A
This specification covers a fiberglass reinforced silicone rubber in the form of sheet, strip, and molded parts, color coded light blue per ARP1527.
Viewing 1 to 30 of 3417

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