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Bolt, Machine - Hexagon Head, PD Shank, Cres AMS5731, .4375-20 UNJF-3A

E-25 General Standards for Aerospace and Propulsion Systems
  • Aerospace Standard
  • AS3103A
  • Current
Published 2018-12-14 by SAE International in United States

Scope is unavailable.

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Physical Layer, 250 Kbps, Un-Shielded Twisted Pair (UTP)

Truck Bus Control and Communications Network Committee
  • Ground Vehicle Standard
  • J1939/15_201812
  • Current
Published 2018-12-14 by SAE International in United States

This document describes a physical layer utilizing Unshielded Twisted Pair (UTP) cable with extended stub lengths for flexibility in ECU placement and network topology. Also, connectors are not specified.

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AS9145: Requirements for Advanced Product Quality Planning and Production Part Approval

  • Professional Development
  • C1917
Published 2018-12-14

Production and continual improvement of safe and reliable products is key in the aviation, space and defense industries. Customer and regulatory requirements must not only be met, but they are typically expected to exceeded requirements. Due to globalization, the supply chain of this industry has been expanded to countries which were not part of it in the past and has complicated the achievement of requirements compliance and customer satisfaction. The IAQG has established and deployed the AS9145 Standard, as a step to help achieve these objectives. The hope is to also reduce costs worldwide by enforcing these activities through the regional representatives: Americas (AAQG), Europe (EAQG) and Asia/Pacific (APAQG).

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Evaluation of Weldability and Mechanical Properties in Resistance Spot Welding of Ultrahigh-Strength TRIP1100 Steel

Isfahan University of Technology, Iran-Iman Hajiannia, Morteza Shamanian, Masoud Atapour
Islamic Azad University, Iran-Rouholah Ashiri
  • Journal Article
  • 05-12-01-0001
Published 2018-12-14 by SAE International in United States
To use steel in the automotive industry, it is essential to characterize its weldability and weldable current range. The resistance spot welding of ultrahigh-strength transformation-induced plasticity steel (TRIP1100 steel), which is a candidate for application in an autobody, is studied here. Identifying the weld lobe and the best welding parameters and studying the microstructure and mechanical properties of the spot welds of TRIP steel were done using metallurgical techniques, tensile-shear and cross-tension tests, and fractography and microhardness testing. A partial fracture analysis (stepwise tensile test) showed a crack initiated at the tip of the notch. The best range for welding current was found to be 10-12 kA. The diameter of the weld nugget increased up to 5√t; however, it was found that at least 15% increase in the diameter of the weld nugget can result in a more favorable failure. The ductility ratio was found to be less than 0.5 for ultrahigh-strength steel. At the welding currents of 11 and 12 kA, the desired ductility ratio was achieved.
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Parameter Sensitivity and Process Time Reduction for Friction Element Welding of 6061-T6 Aluminum to 1500 MPa Press-Hardened Steel

Clemson University Department of Mechanical Engineering, USA-Saheem Absar, Hongseok Choi, Xin Zhao
Clemson University International Center for Automotive Research, USA-Laine Mears
  • Journal Article
  • 05-12-01-0004
Published 2018-12-14 by SAE International in United States
Conventional fusion joining techniques pervasive in the automotive industry are unable to effectively join aluminum and steel. To solve this problem, a technique termed friction element welding (FEW) has been developed, which is able to join any nonferrous top sheet material to a base steel layer, independent of the base layer strength. FEW works on the same principles as friction welding, as a steel element is pushed and rotated against a nonferrous top sheet to create frictional energy which softens and flows the material around the fastener shaft and under the fastener head, exposing the steel below. The element then contacts the steel and bonds through traditional friction welding. FEW is a four-step process (penetration, cleaning, welding, compression), with two to four parameters (endload, spindle speed, displacement transition, time transition) controlling each step. This research examines the parameter sensitivity of the FEW process in the cleaning, welding, and compression steps with an emphasis on reducing process time while maintaining joint strength. Joint strength is evaluated through transverse shear, cross tension, and fatigue transverse shear. It…
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Steel, Corrosion and Heat-Resistant, Bars, Wire, and Forgings, 18Cr - 13Ni - 2.1Mo, Free Machining, Solution Heat Treated

AMS F Corrosion Heat Resistant Alloys Committee
  • Aerospace Material Specification
  • AMS5649H
  • Current
Published 2018-12-14 by SAE International in United States

This specification covers a corrosion and heat-resistant steel in the form of bars, wire, forgings, and forging stock.

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Bolt, Machine - Hexagon Head, PD Shank, Cres AMS5731, .375-24 UNJF-3A

E-25 General Standards for Aerospace and Propulsion Systems
  • Aerospace Standard
  • AS3102A
  • Current
Published 2018-12-14 by SAE International in United States

Scope is unavailable.

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Bolt, Machine - Hexagon Head, PD Shank, Cres AMS 5731, .3125-24 UNJF-3A

E-25 General Standards for Aerospace and Propulsion Systems
  • Aerospace Standard
  • AS3101A
  • Current
Published 2018-12-14 by SAE International in United States

Scope is unavailable.

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Reduction of Cyclic Variations by Using Advanced Ignition Systems in a Lean-Burn Stationary Natural Gas Engine Operating at 10 Bar BMEP and 1800 rpm

Bader Almansour, Subith Vasu, Sreenath Gupta
  • Journal Article
  • 03-12-01-0005
Published 2018-12-14 by SAE International in United States
In stationary natural gas engines, lean-burn combustion offers higher engine efficiencies with simultaneous compliance with emission regulations. A prominent problem that one encounters with lean operation is cyclic variations. Advanced ignition systems offer a potential solution as they suppress cyclic variations in addition to extending the lean ignition limit. In this article, the performance of three ignition systems-conventional spark ignition (SI), single-point laser ignition (LI), and prechamber equipped laser ignition (PCLI)-in a single-cylinder natural gas engine is presented. First, a thorough discussion regarding the efficacy of several metrics, besides coefficient of variation of indicated mean effective pressure (COV_IMEP), in representing combustion instability is presented. This is followed by a discussion about the performance of the three ignition systems at a single operational condition, that is, same excess air ratio (λ) and ignition timing (IT). Next, these metrics are compared at the most optimal operational points for each ignition system, that is, at points where λ and IT are optimized to achieve highest efficiency. From these observations, it is noted that PCLI achieves the highest increase…
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Understanding the Origin of Cycle-to-Cycle Variation Using Large-Eddy Simulation: Similarities and Differences between a Homogeneous Low-Revving Speed Research Engine and a Production DI Turbocharged Engine

University of Modena and Reggio Emilia, Italy-Alessandro d'Adamo, Sebastiano Breda, Fabio Berni, Stefano Fontanesi
  • Journal Article
  • 03-12-01-0007
Published 2018-12-14 by SAE International in United States
A numerical study using large-eddy simulations (LES) to reproduce and understand sources of cycle-to-cycle variation (CCV) in spark-initiated internal combustion engines (ICEs) is presented. Two relevantly different spark-ignition (SI) units, that is, a homogeneous-charge slow-speed single-cylinder research unit (the transparent combustion chamber (TCC)-III, Engine 1) and a stratified-charge high-revving speed gasoline direct injection (GDI) (Engine 2) one, are analyzed in fired operations. Multiple-cycle simulations are carried out for both engines and LES results well reproduce the experimentally measured combustion CCV. A correlation study is carried out, emphasizing the decisive influence of the early flame period variability (1% of mass fraction burnt (MFB1)) on the entire combustion event in both ICEs. The focus is moved onto the early flame characteristics, and the crucial task to determine the dominant causes of its variability (if any) is undertaken. A two-level analysis is carried out: the influence of global parameters is assessed at first; second, local details in the ignition region are analyzed. A comparison of conditions at combustion onset is carried out and case-specific leading factors for combustion…
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