Ultrasound array camera can help carbon fiber quality assurance

2015 ◽  
Vol 59 (6) ◽  
pp. 277
Author(s):  
David L. Christensen ◽  
Elliot W. Hawkes ◽  
Annjoe Wong-Foy ◽  
Ronald E. Pelrine ◽  
Mark R. Cutkosky

This paper addresses inspection techniques that can be performed by microrobots used for fabricating three dimensional structures. In contrast to most commercial rapid prototyping processes, the parallelism afforded by microrobot teams allows incremental inspection of structures during assembly. In the present case, this approach is applied to parts fabricated from carbon fiber struts bonded with UV-cured epoxy. Preliminary tests involving thermal and vibrational inspection methods are described and compared with the results of FEA models of the joints. Vibrational inspection performed by microrobots and recorded using a directional microphone, characterizes bond joint natural frequency with good resolution (an average measurement standard deviation of 5Hz over a range of 650–1215 Hz). These effective stiffness measurements are correlated with ultimate bond strength as well. The measurements are sufficient to distinguish between joints that do or do not have desired amounts of adhesive.


2021 ◽  
pp. 110-117
Author(s):  
Aime M. Gloi ◽  
Javis Jackson ◽  
Angela Sonnier

Kobunshi ◽  
1999 ◽  
Vol 48 (11) ◽  
pp. 857-857
Author(s):  
Ryuichi YAMAMOTO

2017 ◽  
Vol 3 (1) ◽  
pp. 10-20 ◽  
Author(s):  
Frederic J. C. Fischer ◽  
Matthias Beyrle ◽  
Arthur-Hans Thellmann ◽  
Manuel Endrass ◽  
Thomas Stefani ◽  
...  

Author(s):  
Hong-Ming Lin ◽  
C. H. Liu ◽  
R. F. Lee

Polyetheretherketone (PEEK) is a crystallizable thermoplastic used as composite matrix materials in application which requires high yield stress, high toughness, long term high temperature service, and resistance to solvent and radiation. There have been several reports on the crystallization behavior of neat PEEK and of CF/PEEK composite. Other reports discussed the effects of crystallization on the mechanical properties of PEEK and CF/PEEK composites. However, these reports were all concerned with the crystallization or melting processes at or close to atmospheric pressure. Thus, the effects of high pressure on the crystallization of CF/PEEK will be examined in this study.The continuous carbon fiber reinforced PEEK (CF/PEEK) laminate composite with 68 wt.% of fibers was obtained from Imperial Chemical Industry (ICI). For the high pressure experiments, HIP was used to keep these samples under 1000, 1500 or 2000 atm. Then the samples were slowly cooled from 420 °C to 60 °C in the cooling rate about 1 - 2 degree per minute to induce high pressure crystallization. After the high pressure treatment, the samples were scanned in regular DSC to study the crystallinity and the melting temperature. Following the regular polishing, etching, and gold coating of the sample surface, the scanning electron microscope (SEM) was used to image the microstructure of the crystals. Also the samples about 25mmx5mmx3mm were prepared for the 3-point bending tests.


2020 ◽  
Vol 8 (32) ◽  
pp. 16661-16668
Author(s):  
Huayao Tu ◽  
Shouzhi Wang ◽  
Hehe Jiang ◽  
Zhenyan Liang ◽  
Dong Shi ◽  
...  

The carbon fiber/metal oxide/metal oxynitride layer sandwich structure is constructed in the electrode to form a mini-plate capacitor. High dielectric constant metal oxides act as dielectric to increase their capacitance.


Sign in / Sign up

Export Citation Format

Share Document