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Fundamentals of Fatigue Analysis

  • Professional Development
  • C1875
Published 2019-11-26

Fatigue is a structural failure mode that must be recognized and understood in order to develop products that meet life cycle durability requirements. Fatigue strength is an important design requirement in any new vehicle, particularly in the age of lightweighting as engineers struggle to meet stringent weight requirements without adversely impacting durability. This technical concept course provides an introduction to the fatigue failure mode and analysis methods. Attendees will learn about the physics of material fatigue, including damage accumulation which over time may progress to product failure. Attendees will also learn about fatigue analysis methods such as stress-life (SN), strain-life (EN), and crack growth, investigating the assumptions and applicability of each. This course includes example problems which are solved by hand calculation, exploring and reinforcing key concepts. Emphasis is placed on the practical aspects of these concepts and methods so attendees are prepared to put this knowledge into action. This course is popular with both experienced analysis engineers and with engineers transitioning into a durability or analysis role as it provides the needed foundation to develop effective fatigue prediction capabilities.

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Accelerated structural durability testing of backhoe loader by creation of duty cycle from field data to predict failure modes.

International Centre for Automotive Technology-Varun Singla
  • Technical Paper
  • 2019-28-2583
Published 2019-11-21 by SAE International in United States
These days backhoe loader have become main part of construction equipment vehicles. The main function of backhoe is to dig ditches to lay pipes and underground cable, set up foundations for buildings and create drainage systems. During these operations, many failures are observed in backhoe loader structure/parts. With the help of Accelerated structural durability testing, life of backhoe loader & its part can be estimated; through which we can understand different failure modes. The real time data was collected during various operations which includes pit digging, duck walk, ditch climbing, levelling, dozing, piling, truck loading etc. We have used software based approach to process the strain, displacement and other data collected during real time operation to create the duty cycle. The same duty cycle was simulated in the lab condition using servo hydraulic actuators. Paper will discuss the study of engineering results in terms of strain & displacement at critical joints between real time operation & simulation of same in lab.
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Machine Learning considerations in the context of Automotive Functional Safety Requirements for Autonomous Vehicles

General Motors LLC-Vijai K Gopalakrishnan
  • Technical Paper
  • 2019-28-2519
Published 2019-11-21 by SAE International in United States
We are currently in the age of developing Autonomous Vehicles (AV). Never before in history, the environment has been as conducive as today for these developments to come together to deliver a mass produced autonomous car for use by general public on the roads. Several enhancements in hardware, software, standards and even business models are paving the way for rapid development of AVs, bringing them closer to production reality. Safety is an indispensable consideration when it comes to transportation products, and ground vehicle development is no different. We have several established standards. When it comes to Autonomous Vehicle development, an important consideration is ISO 26262 for, Automotive Functional Safety. Going from generic frameworks such as Failure Mode and Effects Analyses (FMEA) and Hazard and operability study (HAZOP) to Functional Safety, Safety of Intended Functionality, and Automotive Safety Integrity Levels specific is a natural progression. This, in specific to AV development context with a renewed perspective is the need of the hour. The fundamental assumption of a human driver being part of the vehicle, considered in…
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Digital Twins for Prognostic Profiling

Altair Engineering India Pvt Ltd.-Painuri Thukaram, Sreeram Mohan
  • Technical Paper
  • 2019-28-2456
Published 2019-11-21 by SAE International in United States
Ability to have least failures in products on the field with minimum effort from the manufacturers is a major area of focus driven by Industry 4.0 initiatives. Amidst traditional methods of performing system/subsystem level tests often does not enable the complete coverage of a machine health performance predictions. This paper highlights a workable workflow that could be used as a template while considering system design especially employing Digital Twins that help in mimicking real-life scenarios early in the design cycle to increase product’s reliability as well as tend to near zero defects.With currently available disruptive technologies, systems integrated multi-domain 'mechatronics' systems operating in closed-loop/close-interaction. This poses great challenge to system health monitoring as failure of any component can trigger catastrophic system failures. It may be the reason that component failures, as per some aerospace reports, are found to be major contributing factors to aircraft loss-of-control. Essentially, it is either too expensive or impossible to monitor every component or subsystem of a complex machine and the current state of the Integrated Health Monitoring Systems seem to…
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Photo oxidation analysis method for automotive coating weathering performance evaluation

Mahindra Engineering-Rahul Lalwani
Mahindra Research Valley-Divya Pande, B Jayanthan, Vinay Kumar
  • Technical Paper
  • 2019-28-2555
Published 2019-11-21 by SAE International in United States
RESEARCH OBJECTIVE Accelerated artificial weathering performance has been always observed as critical and most important factor for durability prediction of colour and resin for a coating system. Photo oxidation of resin is the phenomenon behind coating’s ageing. Though accelerated weathering tests protocols are widely used in industry, they are very costly and still very time consuming. One automotive grade accelerated testing can go as long as 8 months duration. METHODOLOGY (maximum 150 words) Photo oxidation value (POV) is proportionate to the degradation of the resin material used in coating. During the accelerated weathering POV is measured for the coating at stipulated interval during initial phase and trend is plotted for deterioration verses weathering test duration. POV can be analysed with the help of FTIR analysis to observe bond absorption energy and bond separation energy in the resin system. This trend can be extrapolated to predict the weathering performance of coating. This method can save huge time in predicting the weathering performance and decision making. RESULTS (maximum 150 words) Photo oxidation degradation study was performed on…
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Logistics Product Data

LCLS Life Cycle Logistics Supportability
  • Aerospace Standard
  • GEIASTD0007C
  • Current
Published 2019-11-06 by SAE International in United States
SAE GEIA-STD-0007C defines logistics product data generated during the requirement definition and design of an industry or government system, end item, or product. It makes use of the Extensible Markup Language (XML) through the use of entities and attributes that comprise logistics product data and their definitions. The standard is designed to provide users with a uniform set of data tags for all or portions of logistics product data. The standard can be applied to any industry or government product, system or equipment acquisition program, major modification program, and applicable research and development projects. This standard is for use by both industry and government activities. As used in this standard, the requiring authority is generally the customer and the customer can be a government or industry activity. The performing activity may be either a industry or government activity. The use of the term “contract” in this standard includes any document of agreement between organizations.
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Additively Manufactured Component Substantiation

AMS AM Additive Manufacturing
  • Aerospace Standard
  • AIR7352
  • Current
Published 2019-10-31 by SAE International in United States
This AIR is applicable to components fabricated using additive manufacturing (AM) processes. The discussion is generic with respect to specific additive processes as much as possible. Each additive process has unique considerations that should be addressed in any effort to substantiate additively manufactured components, This specification is written for metallics but conceptually could be applied to non-metallics.
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Tire Forensic Analysis

  • Professional Development
  • C1969
Published 2019-10-25

This course provides a detailed description of tire failure modes, their potential causes, identification, and the sometimes-subtle nuances that go along with determination of tire failure. In addition, proper inspection techniques of tires will be discussed and samples will be available to reinforce the concepts learned.

Basic Tire Mechanics and Applications

  • Professional Development
  • C1968
Published 2019-10-25
This course introduces basic tire mechanics, including tire construction components based on application type, required sidewall stamping in accordance with DoT/ECE regulations, tread patterns, regulatory and research testing on quality, tire inspections and basic tire failure identification. The course will provide you with information that you can use immediately on-the-job and apply to your own vehicle. This course is practical in nature and supplemented with samples and hands-on activities. It serves as a good primer for the in-depth SAE Tire Forensic analysis course.By attending this seminar, you will be able to: Read the sidewall stamping information on a tire and explain all of the nomenclatureDescribe the various types of tread patterns and what they mean on a tireDescribe what is inside the tire and how that relates to some of the sidewall stampingsDescribe tire components and the functionality of each part1 Day .7 CEUs
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Tire Burst Test Methodology

A-5C Aircraft Tires Committee
  • Aerospace Standard
  • ARP6265
  • Current
Published 2019-10-17 by SAE International in United States
This document describes a recommended test procedure to assess the burst characteristics of tires used on 14CFR Part 25 or similar transport airplanes.
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