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Characterization and Durability of Mold-In-Color Engineering Plastics

Mahindra & Mahindra, Ltd.-Sandeep Kumar Shukla
  • Technical Paper
  • 2019-28-2542
Published 2019-11-21 by SAE International in United States
Plastics are prone to photo oxidative and thermal oxidative degradation under usage conditions due to their chemical nature. From sustainability and cost standpoint, there is an increasing focus on Mold-In-Color (MIC) plastic materials. Simultaneously customer’s expectations on the perceived quality of these MIC parts has been increasing with attractive color and glossy appearance. A study was conducted to analyze the product quality and durability aspects over a prolonged exposure to accelerated weathering condition. Material selected for this study were injection molded specimens of ABS and PC/ABS used in automotive passenger vehicles. Comparative analysis was conducted before and after weathering exposure at defined intervals by using the various tools like Fourier Transform infra-red spectrometer (FTIR), thermogravimetric analyzer (TGA) and universal testing machine (UTM), Izod impact tester, dynamic mechanical analyzer (DMA) to understand the impact on their chemical and mechanical properties. This study will be useful in understanding material behavior, durability, performance and product quality.
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Determine Thermal Fatigue Requirements for PEPS Antenna Copper Wire over Vehicle Lifetime with defined Reliability Requirements.

GMTCI-Abhinav Jauhri
  • Technical Paper
  • 2019-28-2582
Published 2019-11-21 by SAE International in United States
Reliability states the degree to which the result of a measurement, calculation, or specification can be depended on to be accurate. And, tests according to GMW specifications represents a minimum of 15 years of vehicle life time with defined Reliability and Confidence level. In this work, actual number of thermal cycles for Thermal Fatigue tests (Thermal Shock and Power Temperature Cycle) are calculated for Copper Wire whose Coffin Manson exponent is 5. Overstressing the PEPS Antenna under thermal fatigue requirement (defined number of thermal cycles based on Reliability and Confidence requirements) will lead to broken Copper wire which will result in component’s functional failure and thus impossible to continue reliability testing. The objective of this paper is to determine thermal fatigue requirements for Antenna’s Copper wire whose Coffin Manson exponent is 5. Testing with exact number of thermal cycles will reduce the validation failures owing to broken Copper wire and thus save incurred revalidation cost. The current study is limited to only adjusting the thermal fatigue requirements (Number of Thermal Cycles) for only specific E/E…
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SIMULATION OF SOFTENING AND RUPTURE IN MULTILAYERED FUEL TANK MATERIAL

General Motors Technical Center India-Vijaya Kumar R L, Biswajit Tripathy, Jayaraj Radhakrishnan
  • Technical Paper
  • 2019-28-2557
Published 2019-11-21 by SAE International in United States
Research and/or Engineering Questions/Objective Plastic automotive fuel tanks made up of blow molded, multi-layered, high-density polyethylene (HDPE) material can take complex shapes with varying thickness. Accidental drop of fuel tank from a height during handling can lead to development of cracks. Damage can also occur due to an impact during a crash. This can be catastrophic due to flammability of the fuel. The objective of this work is to characterize and develop a failure model for the fuel tank material to simulate damage and enhance predictive capability of CAE for chassis and safety load cases. Methodology Different aspects were considered to develop a characterization and modelling strategy for the HDPE fuel tank. Material properties can be influenced by factors such as, service temperature, rate of deformation, state of stress etc. Hence, samples cut-out from different regions of the fuel tank were subjected to a variety of tests such as tensile test at different strain rates viz. 0.01/s, 0.1/s, 1/s, 10/s and 100/s, compression, shear, flexure and instrumented dart impact tests at different temperatures, -40°C, 23°C…
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Steel, Corrosion and Heat-Resistant, Welding Wire 15Cr - 25.5Ni - 1.3Mo - 2.2Ti - 0.006B - 0.30V

AMS F Corrosion Heat Resistant Alloys Committee
  • Aerospace Material Specification
  • AMS5804H
  • Current
Published 2019-11-12 by SAE International in United States
This specification covers a corrosion and heat-resistant steel in the form of welding wire.
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Nickel-Iron Alloy, Corrosion and Heat-Resistant, Welding Wire 12.5Cr - 42.5Ni - 6.0Mo - 2.7Ti - 0.015B - 35Fe

AMS F Corrosion Heat Resistant Alloys Committee
  • Aerospace Material Specification
  • AMS5830C
  • Current
Published 2019-11-12 by SAE International in United States
This specification covers a corrosion and heat-resistant nickel-iron alloy in the form of welding wire.
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Titanium Alloy Bars, Forgings, and Rings, 6Al - 4V Extra Low Interstitial (ELI), Duplex Annealed, Fracture Toughness

AMS G Titanium and Refractory Metals Committee
  • Aerospace Material Specification
  • AMS4931G
  • Current
Published 2019-11-05 by SAE International in United States

This specification covers a titanium alloy in the form of bars 6.000 inches (152.40 mm) and under in nominal diameter or least distance between parallel sides, forgings and flash welded rings 6.000 inches (152.40 mm) and under in thickness, and stock for forging and stock for flash welded rings of any size.

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Towards High Accuracy Parking Slot Detection for Automated Valet Parking System

Tongji University-Qinghua Yang, Hui Chen, Junzhe Su, Jie Li
Published 2019-11-04 by SAE International in United States
Highly accurate parking slot detection methods are crucial for Automated Valet Parking (AVP) systems, to meet their demanding safety and functional requirements. While previous efforts have mostly focused on the algorithms’ capabilities to detect different types of slots under varying conditions, i.e. the detection rate, their accuracy has received little attention at this time. This paper highlights the importance of trustworthy slot detection methods, which address both the detection rate and the detection accuracy. To achieve this goal, an accurate slot detection method and a reliable ground-truth slot measurement method have been proposed in this paper. First, based on a 2D laser range finder, datapoints of obstacle vehicles on both sides of a slot have been collected and preprocessed. Second, the Density-Based Spatial Clustering of Applications with Noise (DBSCAN) algorithm has been improved to efficiently cluster these unevenly-distributed datapoints. After that, the Random Sample Consensus (RANSAC) algorithm has been improved to accurately fit the vehicles’ longitudinal contours. Finally, the candidate slot has been constructed and checked for its rationality. The final slot detection results have…
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Research on CAN FD Controller Conformance Test System

Tongji University-Feng Luo, Zhuo Fu
Published 2019-11-04 by SAE International in United States
The Controller Area Network with Flexible Data-Rate (CAN FD) is invented to compensate for the limited bandwidth of Controller Area Network (CAN). The technology of CAN FD bus conformance test is a prerequisite for the interconnection and normal work of different manufacturers’ CAN FD module, and is of great significance for ensuring the reliability of the CAN FD network. Firstly, the communication protocol conformance test theory is briefly analyzed and the characteristics of the CAN FD protocol are introduced in this paper. Then the test scope and test objects of CAN FD conformance test are pointed out. This paper mainly focuses on the CAN FD controller conformance test, which is belong to chip test. The controller implements the most parts of data link layer in a CAN FD module. Furthermore, the test method and the test cases are elaborated. Based on the coordinated test method, a conformance test system is designed and the hardware and software are developed for the test system. The execution of the test process requires communication and coordination between the test…
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Design and Research of Intelligent Vehicle EPB Controller Based on ISO26262 Standard

Nanjing Tech University-Min Song
Senior-Tian Le Jia
Published 2019-11-04 by SAE International in United States
In recent years, the development of intelligent vehicle and new energy vehicles has advanced by leaps and bounds, which has further improved the safety requirements of controllers. And more and more component manufacturers are actively promoting the ISO 26262 standard “Road Vehicles-Functional Safety”. At the same time, the electronic parking brake (EPB) system is an indispensable electronic product of the intelligent vehicle, which brings convenience to drivers and improves vehicle safety. So it is necessary to develop an intelligent vehicle pneumatic EPB system based on the ISO 26262 standard to improve reliability and safety. In this paper, the concept phase of the ISO 26262 standard was analyzed and applied to the design of the EPB system. The risk assessment and risk analysis of the EPB system were carried out, and the corresponding safety objectives were formulated. In this paper, a dual MCU scheme was proposed to the EPB system, which contained the core MCU and the monitoring MCU. Then the hardware circuit is designed according to the proposed safety goal, including mutual reset circuit and…
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Deliverable Aerospace Software Supplement for AS9100A Quality Management Systems - Aerospace - Requirements for Software (Based on AS9100A)

G-14 Americas Aerospace Quality Standards Committee (AAQSC)
  • Aerospace Standard
  • AS9006B
  • Current
Published 2019-10-31 by SAE International in United States

The basic requirements of AS9100A apply with the following clarifications.