Results 81 to 90 of about 24,069 (204)

Space fabrication demonstration system: Executive summary [PDF]

The results of analysis and tests conducted to define the basic 1-m beam configuration required, and the design, development, fabrication, and verification tests of the machine required to automatically produce these beams are ...

core   +1 more source

Index to NASA Tech Briefs, 1975 [PDF]

, 1976
This index contains abstracts and four indexes--subject, personal author, originating Center, and Tech Brief number--for 1975 Tech ...

core   +1 more source

Comparison of 4-ball and 5-ball rolling contact fatigue tests on lubricated Si3N4/steel contact [PDF]

, 2003
Accelerated four-ball and five-ball rolling tests were performed on HIPed Si3N4 ball samples (rough lapped with surface roughness value Ra0.08 μm and Rq0.118 μm) in fully lubricated condition.
Hadfield, M, Kang, J
core  

The effect of ultrasonic surface rolling process on the gradient microstructure and wear resistance of AZ31 thin sheet

Journal of Magnesium and Alloys
This study investigates the effects of the ultrasonic surface rolling process (USRP) on the surface microstructure, texture, and wear behavior of commercial AZ31 magnesium alloy sheet.
Rongxue Liu, Xihai Li, Yifan Song, Zhaojie Wang, Lingyu Zhao, Fangqiang Ning, Hong Yan, Rongshi Chen   +7 more
doaj   +1 more source

Formation mechanism of surface gradient microstructure and mechanical properties evolution of Mg–Y-Nd-Gd-Zr alloy by ultrasonic rolling

Journal of Materials Research and Technology
The evolution mechanism of the microstructure and mechanical properties of a Mg–Y-Nd-Gd-Zr alloy subjected to different numbers of passes of the ultrasonic surface rolling process (USRP) was investigated.
Sheng Wang, Wei Li, Linbo Chen, Lin Luo, Gang Meng, Guoqi Chang, Qiaodi Liu   +6 more
doaj   +1 more source

Automated beam builder [PDF]

, 1980
Requirements for the space fabrication of large space structures are considered with emphasis on the design, development, manufacture, and testing of a machine which automatically produces a basic building block aluminum beam.
Muench, W. K.
core   +1 more source

Effect of ultrasonic surface rolling process on microstructure and properties of hydride sintered pure titanium

Fenmo yejin jishu
Surface hardening of the pure titanium sintered by titanium hydride was treated by ultrasonic surface rolling process (USRP) in this paper, and the effects of USRP on the microstructure evolution and properties of the hydride sintered pure titanium were ...
YAO Jing, ZHANG Jiantao, LI Xingyi, LIU Zhongqiang, LIU Xiao, XIAO Zhiyu   +5 more
doaj   +1 more source

A Module Experimental Process System Development Unit (MEPSDU) [PDF]

Design work for a photovoltaic module, fabricated using single crystal silicon dendritic web sheet material, resulted in the identification of surface treatment to the module glass superstrate which improved module efficiencies.

core   +1 more source

Study on the enhancement of surface integrity and wear resistance of iron-based coatings by ultrasonic surface rolling process

Journal of Materials Research and Technology
This study explores the fabrication of iron-based coatings on 45CrNiMoVA steel using laser cladding technology. Laser cladding offers advantages such as a low dilution rate and a dense microstructure but is hindered by drawbacks like poor surface finish ...
Xinsheng Wang, Yang Zheng, Jian Liu, Zhihai Cai, Xian Du, Haidou Wang   +5 more
doaj   +1 more source

Technology transfer-transportation [PDF]

Problems in the public transportation industry and refining methods for decreasing the time gap between the development and the marketing of new technology are considered.
Anyos, T., Lizak, R., Wilhelm, J.
core   +1 more source