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Stress Relaxation in Bolted Joints of Die Cast Magnesium Components
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English
Abstract
As the use of magnesium continues to grow in the automotive industry, new developments for lightweight driveline components are gaining more interest. Therefore, the need to develop alloys with greater creep resistance and better knowledge of the bolt load behaviour is necessary. Through continuing efforts in research and development, appropriate technical solutions can be found. As a tool in this development work, laboratory test equipment for direct measurements of the bolt load behaviour has been developed based on the use of strain gauged bolts.
Bolt load retention behaviour was investigated using Grade 8.8 M8 x 1.25 and M10 x 1.50 standard fasteners which were modified and equipped with strain gauges. The modified fasteners recorded the bolt load during thermal cycling of bolted test specimens of die cast AZ91, AS21 and AE42 magnesium alloys. The test specimens were exposed to various thermal cycles for 100 hours and 500 hours at 125° C and 150° C. The effect of washer size, bolt diameter and coupon thickness are presented along with the effects of disassembly and reassembly.
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Authors
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Citation
Pettersen, K. and Fairchild, S., "Stress Relaxation in Bolted Joints of Die Cast Magnesium Components," SAE Technical Paper 970326, 1997, https://doi.org/10.4271/970326.Also In
Characteristics and Applications of Magnesium in Automotive Design
Number: SP-1250; Published: 1997-02-24
Number: SP-1250; Published: 1997-02-24
References
- Schmidt, W. “Magnesium Gusswerkstoffe mit erhöhter Warmfestigkeit” Giesserei 57 1970 535 538
- Suman, C. “Creep of Diecast Magnesium Alloys AZ91D and AM60B” SAE paper no. 910416
- Foerster, G.S. “New Developments in Magnesium Die Castings” IMA Annual Conference 1976 35 39
- Höllrigl-Rosta, F. Just, E. Köhler, J. Melzer, H.J. “Magnesium im Volkswagen” Metall 34 1980 1138 1141
- Nelson, K.E. “Magnesium Die Casting Alloys” 6th SDCE international die casting conference 1970
- Foerster, G.S. “Designing Die Casting Alloys” 7th SDCE international die casting conference 1972
- Couling, S.L. “New Magnesium Alloys” Metals Eng. Quarterly may 1972 7 13
- Mercer, W.E. “Magnesium Die Cast Alloys for Elevated Temperature Applications” SAE paper no. 900788
- Albright, D.L. Aune “Stress Relaxation Behavior of Die Casting Alloys” SAE 1991 p.n. 910412
- Aune, T.K. Ruden, T.J. “High temperature Properties of Magnesium Die Casting Alloys” SAE 1992 p.n. 920070
- Aune, T.K. Westengen, H. “Property Update on Magnesium Die Casting Alloys” SAE 1995 p.n. 950424
- Pettersen, K. Siedersleben, M. “Castability and Mechanical Properties of Magnesium-based Alloys, Related to the Production of Automotive Transmission Housings” 15. Int. Pressure Die Casting Conference Montreux 1996
- Siedersleben, M. Pettersen, K. “Fertigungserfahrungen mit unterschiedligen Magnesiumlegierungen” 1996 146 149
- Sieracki, E.G. Velazquez, J.J. Kabiri, K. “Compressive Stress Retention Characteristics of High Pressure Die Casting Magnesium Alloys” SAE 1996 p.n. 960421
- Dutton, R. “A Survey of Compressoin Creep Testing of Metals” Mater. Res. Stand. 9 1969 11 17
- Westengen H. Olsen A.L. “Magnesium die castings for automotive applications” ATA-MAT 94 Conference October 5-7 1994 Torino, Italy
- Hawke D. Ruden T. “Galvanic Compatibility of Coated Steel Fasteners with Magnesium” SAE Technical Paper no. 950429 Detroit February 1995