Fibre failure assessment in carbon fibre reinforced polymers under fatigue loading by synchrotron X-ray computed tomography
Source abstract
Abstract
In situ fatigue experiments using synchrotron X-ray computed tomography (SRCT) are used to assess the underpinning micromechanisms of fibre failure in double notch carbon/epoxy coupons. Observations showed fibre breaks along the 0o ply splits, associated with the presence and failure of bridging fibres, as well as fibres failed in the bulk composite within the 0o plies. A tendency for cluster formation, with multiple adjacent breaks in the bulk composite was observed when higher peak loads were applied, exceeding 70% of the ultimate tensile strength. Ex situ fatigue tests were used to assess the accumulation and distribution of fibre breaks for different loading conditions, varying peak load and number of cycles. A direct comparison with the quasi-static case for an equivalent peak load, considering the same material system and geometry, has shown that fatigue produces a significantly higher number of fibre breaks. This supports the hypothesis that fibre breaks are indeed caused by the load cycling.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Mechanical Behavior of Composites · Fiber-reinforced polymer composites · Composite Material Mechanics
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References (28)
Show source-provided references
1. The tensile and fatigue behaviour of carbon-fibres
2. The cyclic fatigue of high-performance fibers10.1007/s11837-005-0219-6 ↗
3. Harris · 2003
4. Damage accumulation in a carbon/epoxy composite: comparison between a multiscale model and computed tomography experimental results10.1016/j.compositesa.2012.03.011 ↗
5. Tensile failure of fibrous composites10.2514/3.2699 ↗
6. Tensile failure of fibers composites10.2514/3.4990 ↗
7. A statistical theory of material strength with application to composite materials10.1016/0022-5096(70)90023-2 ↗
8. Hedgepeth · 1961
9. Local stress concentrations in imperfect filamentary composite materials10.1177/002199836700100305 ↗
10. The chain-of-bundle probability model for the strength of fibrous materials I: analysis and conjectures10.1177/002199837801200207 ↗
11. Probability distributions for the strength of composite materials I: two-level bounds10.1007/BF00036188 ↗
12. Stress in a three-dimensional unidirectional composite containing broken fibers10.1016/0013-7944(80)90068-5 ↗
13. Strain concentration for fibers and matrix in unidirectional composite10.1016/0266-3538(91)90002-7 ↗
14. Tensile strength of unidirectionally reinforced composites. I10.1177/073168448200100206 ↗
15. Lower-Tail approximations for the probability of failure of three-dimensional fibrous composites with hexagonal geometry10.1098/rspa.1983.0087 ↗
16. An experimental investigation into the tensile strength scaling of notched composites10.1016/j.compositesa.2006.07.008 ↗
17. An investigation into the damage development and residual strengths of open-hole specimens in fatigue10.1016/j.compositesa.2014.11.013 ↗
18. Ultra high resolution computed tomography of damage in notched carbon fiber-epoxy composites10.1177/0021998308092211 ↗
19. In situ fibre fracture measurement in carbon-epoxy laminates using high resolution tomography10.1016/j.compscitech.2011.06.004 ↗
20. Synchrotron radiation computed tomography for experimental validation of a tensile strength model for unidirectional fibre-reinforced composites10.1016/j.compositesa.2015.06.018 ↗
21. Fatigue damage mechanics of composite materials. I: experimental measurement of damage and post-fatigue properties10.1016/0266-3538(92)90109-G ↗
22. Hexcel HexPly M21. http://www.hexcel.com/Resources/DataSheets/Prepreg-Data-Sheets/M21_global.pdf.
23. In situ synchrotron tomographic evaluation of the effect of toughening strategies on fatigue micromechanisms in carbon fibre reinforced polymers10.1016/j.compscitech.2015.01.012 ↗
24. Fatigue micromechanism characterisation in carbon fibre reinforced polymers using synchrotron radiation computed tomography10.1016/j.compscitech.2014.05.006 ↗
25. High resolution tomographic imaging and modelling of notch tip damage in a laminated composite10.1016/j.compscitech.2010.04.012 ↗
26. Wright · 2011
27. Developments in synchrotron x-ray computed tomography at the national synchrotron light source10.1117/12.363725 ↗
28. Fatigue damage mechanics of composite materials Part III: prediction of post-fatigue strength10.1016/0266-3538(92)90067-D ↗