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54 results on '"Zhang, Qinglong"'

31. Residual stress relief of welded aluminum alloy plate using ultrasonic vibration

Author

Su Zhao, Yu Lei, Shang Xiaofeng, and Zhang Qinglong

Subjects
010302 applied physics, Materials science, Acoustics and Ultrasonics, Vibratory stress relief, Alloy, chemistry.chemical_element, Welding, engineering.material, 01 natural sciences, law.invention, Stress (mechanics), chemistry, Residual stress, law, Aluminium, Normal mode, 0103 physical sciences, engineering, Ultrasonic sensor, Composite material, 010301 acoustics
Abstract

Ultrasonic vibratory stress relief (UVSR) is a novel method for residual stress relieving of metal parts. In this paper, the UVSR method was applied to treat a random-sized plate, which is not designed to match with the resonant frequency of the ultrasonic transducer. The UVSR system includes an ultrasonic generator, a 20 kHz ultrasonic transducer and specially designed fixtures to exert ultrasonic vibration to the treated parts. Based on the experimental results, the average stress relief ratio reached 53% and the final residual stress distribution interval was reduced by 57. The vibratory stress introduced by the ultrasonic vibration was obtained accurately by matching the FE model with the measured vibration amplitude distribution. It is found that local yield stress, instead of macroscopic yield stress, should be used as the threshold of residual stress relieving. Moreover, if the local yield stress of a material is constant, the local yield stress of 6082 aluminum alloy is reduced by at least 27% during the UVSR. Finally, it is found that the residual stress relief rate in one direction is proportional to the vibratory stress introduced in that direction.

Published
2020

34. Latitudinal pattern of soil lignin/cellulose content and the activity of their degrading enzymes across a temperate forest ecosystem

Author

Yang, Shan, primary, Yao, Fei, additional, Ye, Ji, additional, Fang, Shuai, additional, Wang, Zhirui, additional, Wang, Ruzhen, additional, Zhang, Qinglong, additional, Ma, Ruiao, additional, Wang, Xugao, additional, Jiang, Yong, additional, Dorodnikov, Maxim, additional, Li, Hui, additional, and Zou, Hongtao, additional

Published
2019
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48. Properties of electroless Ni-W-P amorphous alloys

Author

Qu Xuanyuan, Zhang Qinglong, Hu Wangyu, and Zhang Bangwei

Subjects
Materials science, Amorphous metal, Mechanical Engineering, Phosphorus, Metallurgy, chemistry.chemical_element, Condensed Matter Physics, Microstructure, Indentation hardness, Amorphous solid, Metal, Nickel, chemistry, Mechanics of Materials, visual_art, visual_art.visual_art_medium, General Materials Science, Chemical composition
Abstract

This paper describes work performed to determine some of the properties of the electroless Ni-W-P amorphous deposits. Phosphorus contents were varied up to 32 at.%, and the amorphous structure was found to be present at phosphorus contents above 5 at.%. Irrespective of P content, all the deposits exhibited excellent adhesion to metallic substrates. The addition of even small amounts of W provided greatly increased hardness compared with the plain Ni-P deposits. The wettability properties of the Ni-W-P deposits were found to be comparable to those of Ni-P and N-B-P deposits but inferior to those of Ni-B deposits. (C) Elsevier Science Inc., 1996

Published
1996

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