On the applicability of high strength self‐tapping aluminium bolts in magnesium nut materials for automotive applications

Gerstmayr, Gerhard; Mori, Gregor; Leitner, Harald; Eichlseder, Wilfried

doi:10.1002/maco.200905409

Cited by 11 publications

(6 citation statements)

References 6 publications

(4 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…T s that the bolt receives is expressed as the following equation removing the term of friction of the bearing surface from the tightening torque T expressed in Eq. ( 1) and (2).…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

The Tightening Characteristics of Magnesium Alloy Bolts

Hashimura¹,

Kurakake

Miyashita

et al. 2011

JMMP

View full text Add to dashboard Cite

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.

show abstract

“…T s that the bolt receives is expressed as the following equation removing the term of friction of the bearing surface from the tightening torque T expressed in Eq. ( 1) and (2).…”

Section: Resultsmentioning

confidence: 99%

“…In recent years, due to the rapid progress of lightweight technology, the demand for lightweight mechanical and electronic parts has been increasing (1)(2)(3) . To indicate an appropriate fastening guideline for magnesium alloy or aluminum alloy components is very important for the safe use of lightweight components.…”

Section: Introductionmentioning

confidence: 99%

The Tightening Characteristics of Magnesium Alloy Bolts

Hashimura¹,

Kurakake

Miyashita

et al. 2011

JMMP

View full text Add to dashboard Cite

show abstract

“…For now, most relevant investigations focus on the corrosion mechanism of bolted connection and the change of load-carrying performance after corrosion in different structures. For instance, several researchers [17][18][19][20][21][22][23] investigated the bolted joints' corrosion mechanism in aircraft, steel bridges, satellite launch vehicles, and automotive applications, respectively. Moreover, some investigations [24][25][26][27][28] on structural performance degradation caused by bolt corrosion have been reported.…”

Section: Introductionmentioning

confidence: 99%

Identification of multi-bolt head corrosion using linear and nonlinear shapelet-based acousto-ultrasonic methods

Wang

2021

Smart Mater. Struct.

View full text Add to dashboard Cite

Among different types of fasteners used in multiple industries, the bolted connection attracts the most attention due to its low costs and ease of operation. However, bolt failures may induce severe catastrophes if not timely detected. One of the most common bolt failures is bolt corrosion (especially at the bolt head), and bolt head corrosion can significantly affect the mechanical performance of the bolted connection and even the entire structure. So far, no relevant investigations have been conducted to detect multi-bolt head corrosion, and thus the author applies the linear and nonlinear acousto-ultrasonic methods to attempt to solve this problem for the first time. Notably, this paper’s main contribution is that two new shapelet-based acousto-ultrasonic methods, i.e. shapelet-based active sensing and shapelet-based vibro-acoustic modulation (VAM), are developed by utilizing the concept of time-series shapelets. Compared to existing approaches such as entropy-enhanced acousto-ultrasonic methods, the proposed shapelet-based active sensing and shapelet-based VAM can achieve better detection performance. Finally, by conducting a multi-bolt head corrosion test, the effectiveness of the proposed methods is verified. Overall, the proposed methods can provide a new direction for researching bolt corrosion identification, and they can also contribute to the development of structural health monitoring, e.g. the detection of other structural damages in future work.

show abstract

“…3 Alternative joining technologies are clinching 4 and fasting. 5 While the usage of clinching is limited due to low dynamic strength of clinched magnesium alloy parts, 6 using steel or aluminium bolts is one of the most commonly used processes for joining magnesium–aluminium–zinc alloy components. 7,8 However, due to oscillatory motion during cyclic loading, the friction between the bolt tightened components makes the joint susceptible to fretting fatigue, especially when high tightening torques are employed.…”

Section: Introductionmentioning

confidence: 99%

Protective coatings for mechanical aluminum–magnesium joints

Dzhurinskiy

Leshchinsky

Maeva

et al. 2015

Surface Engineering

View full text Add to dashboard Cite

AZ31 alloy is used as a lightweight material for structural application in the automobile and aircraft production. However, alloy AZ31 is known to have poor corrosion resistant due to high electrochemical activity. In this study, the possibility of improving the corrosion resistance by applying protective coatings deposited by the low pressure cold spray process was investigated. The relative performance of each cold sprayed corrosion preventive coatings was assessed in accordance with American Society for Testing and Materials standards. The data for the bare AZ31 alloy were initially obtained and used as a reference point to compare the corrosion protective performance of different preventive coatings. Electrochemical behaviour of each coating composition was analyzed after a given time period of the accelerated corrosion test. Microstructure and mechanical properties of the deposited preventive coatings are also discussed. The cold sprayed preventive coatings provide sufficient protection to substantially reduce the corrosion rate of alloy AZ31.

show abstract

On the applicability of high strength self‐tapping aluminium bolts in magnesium nut materials for automotive applications

Cited by 11 publications

References 6 publications

The Tightening Characteristics of Magnesium Alloy Bolts

The Tightening Characteristics of Magnesium Alloy Bolts

Identification of multi-bolt head corrosion using linear and nonlinear shapelet-based acousto-ultrasonic methods

Protective coatings for mechanical aluminum–magnesium joints

Contact Info

Product

Resources

About