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Viewing 1 to 30 of 11389
2014-01-15
Journal Article
2013-01-9091
Dongfang Jiang
To get a sequence retainable rainflow cycle counting algorithm for fatigue analysis, an alternate equivalent explanation to rainflow cycle counting is introduced, based on which an iterative rainflow counting algorithm is proposed. The algorithm decomposes any given load-time history with more than one crest into three sub-histories by two troughs; each sub-history with more than one crest is iteratively decomposed into three shorter sub-histories, till each sub-history obtained contains only one single or no crest. Every sub-history that contains a single crest corresponds to a local closed (full) cycle. The mean load and alternate load component of the local cycle are calculated in parallel with the iterative procedure.
2016-01-01
Journal Article
2015-01-9084
Seyedmohammad Shams, Peng Yang, Rani Elhajjar
Abstract The disk spring offers the potential of significant weight savings when designed with continuous fiber reinforced composite materials. The internal stresses in a disk spring are ideally suited for composite material application due to their superior resistance to in-plane and bending stresses. In this study, a composite laminate disk spring is designed, analyzed and fabricated to take advantage of the low specific strength and weight and high damage tolerance of composite laminates. The design of the disk composite spring considers effects of the laminate stacking sequence and the geometric variables on the disk spring's mechanical performance. A continuum damage finite element analysis approach is used to understand the damage initiation and evolution as a function of applied load. Experimental analysis and a progressive damage analysis based on virtual crack closure technique are performed to evaluate the damage tolerance of the disk spring under fatigue loadings.
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.
2016-04-11
Journal Article
2016-01-9081
Sean A. McKelvey, Yung-Li Lee
Abstract Multiaxial loading on mechanical products is very common in the automotive industry, and how to design and analyze these products for durability becomes an important, urgent task for the engineering community. Due to the complex nature of the fatigue damage mechanism for a product under multiaxial state of stresses/strains which are dependent upon the modes of loading, materials, and life, modeling this behavior has always been a challenging task for fatigue scientists and engineers around the world. As a result, many multiaxial fatigue theories have been developed. Among all the theories, an existing equivalent stress theory is considered for use for the automotive components that are typically designed to prevent Case B cracks in the high cycle fatigue regime.
2013-10-25
Magazine
BMW i3 was born electric The carbon-fiber-bodied city car is the German automaker's first series-production entry into the electric-vehicle space. High temperatures narrow material choices for electrified vehicles One of the biggest challenges confronting electric and hybrid-electric vehicle designers today is how to manage the high temperatures stemming from the electrical losses associated with high-power electronics.
2014-07-21
WIP Standard
AIR4923A
This SAE Aerospace Information Report (AIR) provides a tabular listing of materials, procurement specifications, and mechanical properties for bolts and screws developed for use on aerospace propulsion systems designed using the U.S. customary system or the SI system.

The list is intended to give a brief overview of the various kinds of SAE aerospace procurement specifications available when developing bolt and screw part standards.

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.
2000-01-01
Magazine
Simulation solves C5 cargo door problem Dynamic analysis software allows engineers to solve fatigue-related problems without prototypes. UAV development Although unmanned aerial vehicles (UAVs) have been employed successfully by the U.S. military to date, many development and operational challenges remain for these to become viable alternatives for manned aircraft. Aircraft engine testing: the test tig developer Engineers at Belcan's Advanced Engineering & Technology Division share their insights and experiences on the development of aircraft gas turbine test rigs and stands. This is the first installment of a three-part series on aircraft engine testing. Looking back at factory automation The ability to improve quality while substantially reducing the cost of production and span times is becoming a necessity to complete in today's aerospace industry.
CURRENT
2016-12-06
Standard
AMS4962B
This specification covers a premium grade titanium alloy in the form of investment castings.
CURRENT
2016-08-01
Standard
AMS4963D
This specification covers a titanium alloy in the form of bars, wire, forgings, flash welded rings up through 3.999 inches (101.57 mm), inclusive and stock for forging, flash welded rings, or heading.
HISTORICAL
1942-03-01
Standard
AMS5025
2017-04-26
WIP Standard
AMS4988D
This specification covers a titanium alloy in the form of sheet, strip, and plate in thicknesses up through 4.000 inches (101.60 mm).
CURRENT
2014-03-07
Standard
AMS4988C
This specification covers a titanium alloy in the form of sheet, strip, and plate in thicknesses up through 4.000 inches (101.60 mm), inclusive (See 8.7).
HISTORICAL
2013-02-07
Standard
AMS4988B
This specification covers a titanium alloy in the form of sheet, strip, and plate in thicknesses up through 4.000 inches (101.60 mm).
HISTORICAL
2006-05-17
Standard
AMS5035A
This specification covers a low-alloy steel in the form of welding wire.
HISTORICAL
2010-08-18
Standard
AMS5035B
This specification covers a low-alloy steel in the form of welding wire.
HISTORICAL
2001-04-01
Standard
AMS5035
This specification covers a log-alloy steel in the form of welding wire. This wire has been used typically as filler metal for gas-tungsten-arc and gas-metal-arc welding of low-alloy steels of similar composition where the weld area is required to have strength comparable to that of the parent metal, but usage is not limited to such applications.
HISTORICAL
2006-05-17
Standard
AMS5034A
This specification covers a low-alloy steel in the form of welding wire.
HISTORICAL
2001-04-01
Standard
AMS5034
This specification covers a low-alloy steel in the form of welding wire.
CURRENT
1942-12-01
Standard
AMS5033
CURRENT
2016-03-28
Standard
AMS4195D
This specification covers an aluminum alloy in the form of flat sheet and plate 0.500 inch (12.70 mm) and under in nominal thickness.
CURRENT
2016-11-28
Standard
AMS4174E
This specification covers an aluminum alloy in the form of flash welded rings 0.062 to 4.499 inches, incl (1.57 to 114.27 mm incl) in radial thickness, with cross sectional areas up to 32 in2 (206 cm2) (see 8.5).
CURRENT
1954-05-01
Standard
AMS3247
CURRENT
1954-05-01
Standard
AMS3245
CURRENT
1956-05-01
Standard
AMS3246
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.
Viewing 1 to 30 of 11389

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