Optimizing Prestress of Fatigue Property-dominated 8.8-grade Bolts

doi:10.11901/1005.3093.2019.073

Chinese Journal of Materials Research

2019, Vol. 33

Issue (8): 629-634 DOI: 10.11901/1005.3093.2019.073

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Optimizing Prestress of Fatigue Property-dominated 8.8-grade Bolts

Zhuman SONG¹,Rui LI²,Miao QIAN²,Wenbo SHI³,Ke QIAN²,Heng MA²,Qingyin CHEN²,Guangping ZHANG¹(

)

1. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2. Zhejiang Huadian Equipment Testing Institute Co. Ltd. , Hangzhou 310015, China
3. Key Laboratory for Anisotropy and Texture of Materials, Ministry of Education, School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China

Cite this article:

Zhuman SONG,Rui LI,Miao QIAN,Wenbo SHI,Ke QIAN,Heng MA,Qingyin CHEN,Guangping ZHANG. Optimizing Prestress of Fatigue Property-dominated 8.8-grade Bolts. Chinese Journal of Materials Research, 2019, 33(8): 629-634.

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Abstract

The ratio (σ_s/σ_b) of ultimate tensile strength to yield strength for the 8.8-grade bolt were firstly obtained by tensile tests, and then its fatigue properties under the pre-applied stresses of 10%, 30% and 50% of the ultimate tensile strength were investigated, respectively. The results show that the fatigue limit of 8.8-grade bolt decreases from 370 MPa to 263 MPa with increasing the pre-applied stress from 10% to 50% of the ultimate tensile strength. In addition, the effective stress at fatigue limit was obtained as 562.75 MPa by handling the effect of pre-applied stress on the fatigue S-N curves of the 8.8-grade bolt with the effective stress parameter method. It means that the fatigue failure of 8.8-grade bolt will not happen when the effective stress is lower than 562.75 MPa. Finally, the maximum pre-applied stresses and pre-load torque curves corresponding to the 8.8-grade M6 and M27 bolts at different stress ratios were given.

Key words: materials failure and protection fatigue strength effective stress 8.8-grade bolts prestress

Received: 21 January 2019

ZTFLH:

TM752

Fund: Supported by Zhejiang Science and Technology Project(No. 5211HD180005)

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	Articles by authors
	Zhuman SONG
	Rui LI
	Miao QIAN
	Wenbo SHI
	Ke QIAN
	Heng MA
	Qingyin CHEN
	Guangping ZHANG

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https://www.cjmr.org/EN/10.11901/1005.3093.2019.073 OR https://www.cjmr.org/EN/Y2019/V33/I8/629

Fig.1 Dimensions of tensile and fatigue specimens of 8.8-grade bolt (unit: mm)

Table 1 Chemical composition of 8.8-grade bolt (mass fraction， %)

Fig.2 Optical image of microstructure of 8.8-grade bolt

Fig.3 Engineering stress-strain curve of 8.8-grade bolt

Fig.4 S-N curves of 8.8-grade bolt under different applied prestresses

Fig.5 SEM images of fatigue damaged 8.8-grade bolt subjected to different applied prestresses (a) and (b) fatigue crack initiation zone, (c) and (d) fatigue crack growth zone;(a) and (c) σ₀=84 MPa, Δσ/2=400 MPa，(b) and (d) σ₀=420 MPa, Δσ/2=300 MPa

Fig.6 Curves of relationship between effective stress and fatigue life

Fig.7 Relationships between

σ 0107

/σ_b-R and pretightening torque-R

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