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Viewing 1 to 30 of 2666
2016-04-05
Journal Article
2016-01-1560
Bo Lin, Chinedum E. Okwudire
Ball nut assemblies (BNAs) are used in a variety of applications, e.g., automotive, aerospace and manufacturing, for converting rotary motion to linear motion (or vice versa). In these application areas, accurate characterization of the dynamics of BNAs using low-order models is very useful for performance simulation and analyses. Existing low-order contact load models of BNAs are inadequate, partly because they only consider the axial deformations of the screw and nut. This paper presents a low-order load distribution model for BNAs which considers the axial, torsional and lateral deformations of the screw and nut. The screw and nut are modeled as finite element beams, while Hertzian Contact Theory is used to model the contact condition between the balls and raceways of the screw and nut. The interactions between the forces and displacements of the screw and nut and those at the ball-raceway contact points are established using transformation matrices.
2016-04-05
Journal Article
2016-01-1344
Koushi Kumagai, Masaaki Kuwahara, Tsuyoshi Yasuki, Norimasa Koreishi
This paper describes development of FE model for Laser Screw Welding (LSW) fracture and validation of the model with test results. LSW was developed and introduced to vehicles on market by Toyota Motor Corporation in 2013, and this technology is propagating to production vehicles globally. LSW has advanced features such as productivity and large gap allowance. Although the authors had developed the fracture FE model for resistance spot weld, fracture model for the LSW has not been developed. Many comprehensive tests were conducted to develop the fracture model. The results showed that the LSW have two times more variation in fracture mode, compare to traditional resistance spot welding. And the bifurcation fracture mode, which due to clearance between welded plates, was also observed. In order to analyze the fracture phenomenon of the LSW in crash analysis, detailed model using fine solid elements was developed. The model can materialize both case of minimum and maximum clearance.
2016-04-05
Technical Paper
2016-01-0501
Seung Hoon Hong, Frank Yan, Shin-Jang Sung, Jwo Pan, Xuming Su, Peter Friedman
Fatigue behavior of flow drill screw (FDS) joints in lap-shear specimens of aluminum 6082-T6 sheets with and without clearance hole are investigated based on experiments and a structural stress fatigue life estimation model. Lap-shear specimens with FDS joints were tested under quasi-static and cyclic loading conditions. Optical micrographs show that the failure modes of the FDS joints in specimens with and without clearance hole are quite similar under quasi-static and cyclic loading conditions. The fatigue lives of the FDS joints in specimens with clearance hole are longer than those of the FDS joints in specimens without clearance hole for given load ranges under cyclic loading conditions. A structural stress fatigue life estimation model is adopted to estimate the fatigue lives of the FDS joints in lap-shear specimens. The closed from structural stress solution is based on the analytical solution for a plate with a rigid inclusion under a resultant shear load.
2016-02-11
WIP Standard
AS9805A
No scope available.
2016-01-15
WIP Standard
AS3397B

SCOPE IS UNAVAILABLE.

2016-01-15
WIP Standard
AS7431B
Scope is unavailable.
2016-01-09
Standard
MA3424A
SCOPE IS UNAVAILABLE.
2016-01-01
Journal Article
2015-01-9085
Vinod Upadhyay, Xiaoning Qi, Nick Wilson, Dante Battocchi, Gordon Bierwagen, Joy Forsmark, Robert McCune
Abstract This work reports on measurement and analysis of the galvanic interaction between steel self-piercing rivets (SPRs) having several different surface conditions and magnesium alloy substrates under consideration for use in automotive structural assemblies. Rivet surface conditions included uncoated steel, conventional Zn-Sn barrel plating and variations of commercial aluminizing processes, including supplemental layers and sealants. Coating characteristics were assessed using open circuit potential (OCP) measurement, potentiodynamic polarization scanning (PDS), and electrochemical impedance spectroscopy (EIS). The degree of galvanic coupling was determined using zero-resistance ammeter (ZRA) and the scanning vibrating electrode technique (SVET), which also permitted characterization of galvanic current flows in situ.
2015-12-27
Standard
AS7228A
This procurement specification covers aircraft quality solid rivets and tubular end rivets made from a corrosion resistant steel of the type identified under the Unified Numbering System as UNS S30200.
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