ISSN 1005-3093
CN 21-1328/TG
Started in 1987

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Nano melamine cyanurate (NMC) was synthesized by a solvothermal method, and characterized by FTIR, XRD and SEM. The effect of solvents, surfactants, reaction-temperature and -time on the particle size of the product were investigated. NMC can be only obtained by using distilled water as a solvent, a. . .
 Chinese Journal of Materials Research, 2014 Vol. 28 (6): 401-406    DOI: 10.11901/1005.3093.2013.857
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Current Issue More>>
 25 October 2019, Volume 33 Issue 10 Previous Issue
 Select Fatigue Properties and Crack Growth Behavior of ML40Cr Steel for 8.8-grade Bolts WANG Yuanchen,SONG Zhuman,LI Rui,SHI Wenbo,ZHU Yankun,ZHANG Guangping Chinese Journal of Materials Research. 2019, 33 (10): 771-775.   DOI: 10.11901/1005.3093.2019.207 Abstract   HTML   PDF (3730KB) ML40Cr steel for 8.8-grade bolts of power transmission towers was selected as research object in this paper. Considering the fatigue reliability of the bolts fastened under different pre-stresses, tension-tension fatigue and symmetric three-point bending experiments were conducted to investigate the fatigue properties and fatigue crack propagation behavior of ML40Cr steel samples, respectively. The experimental results show that the fatigue limits for smooth samples and notched samples of the ML40Cr steel are 263 MPa and 95 MPa, respectively when the 50% of tensile strength was adopted as the mean stress with different stress amplitudes. The effect of the mean stress on the stress-fatigue life (S-N) curve of the ML40Cr steel samples was investigated by the effective stress method and the corresponding fatigue notch sensitivity 0.31 was obtained. According to the results of symmetrical three-point bending tests the Paris formula of ML40Cr steel for 8.8 bolts is fitted as $da/dN=10-10?K2.2$. Mechanisms of notch fatigue strength and crack growth of the ML40Cr steel for the bolts were also discussed.