S1104-2-2 Influence of thermal history on the clamp force of 9Al-Zn-2Ca Magnesium alloy bolt

Fukuda, Kenji; Yamanaka, Shigeru; Hibi, Genki; Morioka, Kojiro; Takigawa, Yorinobu; Hosokawa, Shuji

doi:10.1299/jsmemecjo.2010.4.0_135

Cited by 3 publications

(1 citation statement)

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“…Industrial manufacturers are focusing on nonferrous bolts such as aluminum alloy bolts because of their lightness and strength. A bolt made of magnesium alloy which is considered the lightest metal for structures has also been developed recently (4) . At present, magnesium alloy bolts are not widely used yet because the strength of the magnesium alloy bolts is considered to be insufficient.…”

Section: Introductionmentioning

confidence: 99%

The Tightening Characteristics of Magnesium Alloy Bolts

Hashimura¹,

Kurakake

Miyashita

et al. 2011

JMMP

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In recent years, due to the rapid progress of lightweight technology, the demand for lightweight mechanical and electronic parts has been increasing. To indicate an appropriate fastening guideline of magnesium alloy or aluminum alloy components is very important for safe use of lightweight components. In this study, tensile tests and tightening tests for magnesium alloy bolts and aluminum alloy bolts have been conducted to investigate the effectiveness of magnesium alloy bolts. The magnesium alloy bolts used in the tests were made of AZ31 and AZX912 (9Al-Zn-2Ca) magnesium alloy, and the aluminum alloy bolts were made of A5056 aluminum alloy. Test results showed that the tensile strength of the aluminum alloy bolts was higher than that of the magnesium alloy bolts. However the results of the tightening tests indicated that the tightening strength of the magnesium alloy bolts was greater than that of the aluminum alloy bolts. The reason the results were different in each test comes down to the magnitude of twisting torque. When a bolt is tightened to a specific clamping force, the bolt receives not only tensile force but also twisting torque. In general, the friction coefficient of aluminum alloy is higher than that of magnesium alloy. Hence an equivalent stress on the aluminum alloy bolts was larger than the same stress on the magnesium alloy bolts because the tightening torque generated when the aluminum alloy bolt was tightened, became larger than in the case of the magnesium alloy bolt. Accordingly the ultimate clamping force of an aluminum alloy bolt turned out to be less than that of a magnesium alloy bolt.

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Section: Introductionmentioning

confidence: 99%

The Tightening Characteristics of Magnesium Alloy Bolts

Hashimura¹,

Kurakake

Miyashita

et al. 2011

JMMP

Self Cite

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Fatigue Characteristics of Nonferrous Bolts at Elevated Temperature

Hashimura

Torii²,

Otsu³

2014

KEM

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In order to investigate fatigue characteristics of nonferrous bolts at elevated temperature, fatigue tests of bolted joints which were tightened with three kinds of nonferrous bolts were been conducted at 100°C atmosphere. The test bolts were made of A5056 aluminum alloy and AZ31 and AZX912 magnesium alloy. Creep tests of the bolts at 100°C atmosphere were also conducted. The results showed that the fatigue limit of A5056 bolt was the highest of all regardless of the ambient temperature. The fatigue limits of AZ31 bolt and AZX912 bolt also were a half of the fatigue limit of A5056 bolt at both ambient temperature. Bolt clamping force losses due to creep deformation were observed for all bolts during fatigue tests at elevated temperature. Hence as additional tests, the creep tests which was controlled either the tensile force or the displacements respectively were conducted. As the results it was seen that the clamping force losses for all bolts were remarkably large although the each creep deformation was different for each bolt material. Therefore the results indicates that we have to pay attention to the clamping force reduction due to creep deformation if we use the nonferrous bolt in high temperature.

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