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A methodology for in-situ micro-compression testing of fiber composites

Paper presented at the Symposium “Micromechanics of Advanced Materials III (Symposium in Honor of Professor James C.M. Li's 90th Birthday)”, Material Science & Technology Conference and Exhibition (MS&T 2015), 4 – 8 October 2015, Columbus, OH, USA
  • Y. Charles Lu , Gyaneshwar P. Tandon and Robert Wheeler
Published/Copyright: August 3, 2016
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 107 Issue 8

Abstract

A methodology for in-situ micro-compression testing of fiber composites has been developed. The tests were performed on carbon fiber reinforced bismaleimide matrix unidirectional composite, IM7/BMI 5250-4. Micro-size specimens were prepared from the bulk composite plaque through a two-step micro-fabrication process and then tested by using a micro-mechanical testing device placed inside the scanning electron microscope chamber. Results show that the fundamental properties (modulus and strength) of the fiber composites obtained from micro-size specimens are consistent with the theoretical estimations and significantly higher than those from macro-size specimens, which may have revealed the presence of size-scale effects in composite materials. The in-situ testing shows that the overall failure mode of the present composite is caused by “micro-buckling” of fibers in shear-mode. High shear strains are seen to occur at the fiber–matrix interfaces, which lead to the micro-cracking and ultimate failure of the composite.

Keywords: Micro-compression; Micro-size specimen; Fiber composite; FIB
*Correspondence address, Dr. Y. Charles Lu, Department of Mechanical Engineering, University of Kentucky, Lexington, KY 40506-0503, USA, Tel.: +1 270 534 3115, Fax: +1 270 534 6292, E-mail:

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Received: 2015-11-20
Accepted: 2016-01-12
Published Online: 2016-08-03
Published in Print: 2016-08-11

© 2016, Carl Hanser Verlag, München

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https://doi.org/10.3139/146.111365
Keywords for this article
Micro-compression; Micro-size specimen; Fiber composite; FIB

Articles in the same Issue

  1. Contents
  2. Contents
  3. Original Contributions
  4. Nanoindentation of carbon microspheres
  5. Thermal and mechanical properties of single-walled and multi-walled carbon nanotube polycarbonate polyurethane composites with a focus on self-healing
  6. Preparation and characterization of ZnO nanorod arrays produced using wet methods
  7. Phase equilibria of the Al–Zn–Fe–V quaternary system at 620 °C
  8. Effect of withdrawal rate and zinc content on pore structure and morphology of lotus-type porous Cu–Zn alloys fabricated using continuous casting
  9. Investigation of tungsten surface changes after interaction with dense plasma streams compared with the results given by a simple 1D model
  10. Investigation of Al2O3/TiC ceramic cutting tool materials with the addition of SiC-coated h-BN: preparation, mechanical properties, microstructure and wear resistance
  11. Effect of the addition of different sintering aids on the densification behavior of zirconia-toughened alumina nanocomposite powder
  12. Mixed mode notch-crack fatigue propagation in the welding zone of 06Cr19Ni10 austenitic stainless steel: Effect of strain strengthening
  13. A study on mechanical and microstructural properties of dissimilar FSWed joints of AA5251–AA5083 plates
  14. Short Communications
  15. A methodology for in-situ micro-compression testing of fiber composites
  16. The synthesis and electrochemical performance of Cu6Sn5 intermetallic nanoparticles as anode material in Li ion batteries
  17. DGM News
  18. DGM News
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