Cyclic fatigue crack propagation of nanoparticle modified epoxy
Source abstract
Abstract
Abstract An experimental study on the fatigue performance of nanoparticle modified epoxy was conducted. Seven material systems were examined which were: neat epoxy (E), 6 and 12 weight percent (wt.%) silica nanoparticle modified epoxy (S6, S12), 6 and 12 wt.% rubber nanoparticle modified epoxy (R6, R12), 3 wt.% each of silica and rubber nanoparticle modified epoxy (S3R3) and 6 wt.% each of silica and rubber nanoparticle modified epoxy (S6R6). Effects of those nanoparticles on the fatigue threshold (Δ G th and Δ K th ) and fatigue crack propagation rates ( da/dN ) were studied. It was found that, compared to neat epoxy (E), nanosilica (S6, S12) increased Δ G th (and Δ K th ) but nanorubber (R6 and R12) did not. However, a synergistic effect was observed on the fatigue threshold when both silica and rubber nanoparticles were added into epoxy. All these nanoparticles, individually or conjointly, decreased da/dN with silica the most effective. Morphology of the fracture surface was examined to understand the role of nanoparticles on toughening mechanisms under cyclic loading, which depended on the applied Δ G levels.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Epoxy Resin Curing Processes · Mechanical Behavior of Composites · Polymer Nanocomposites and Properties
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (23)
Show source-provided references
1. Fracture toughness of nano- and micro-spherical silica-particle-filled epoxy composites10.1016/j.actamat.2008.01.002 ↗
2. Toughening mechanisms in epoxy-silica nanocomposites (ESNs)10.1016/j.polymer.2009.08.014 ↗
3. Toughening mechanisms of nanoparticle-modified epoxy polymers10.1016/j.polymer.2006.11.038 ↗
4. Fracture behaviours of in situ silica nanoparticle-filled epoxy at different temperatures10.1016/j.polymer.2008.06.040 ↗
5. Epoxy nanocomposites-fracture and toughening mechanisms10.1016/j.engfracmech.2006.05.018 ↗
6. On fracture toughness of nanoparticle modified epoxy10.1016/j.compositesb.2011.05.014 ↗
7. Cyclic fatigue of polymer nanocomposites10.1016/j.engfailanal.2009.04.022 ↗
8. The cyclic-fatigue behavior of an epoxy polymer modified with micro-rubber and nano-silica particles10.1007/s10853-009-3653-y ↗
9. Improvements and mechanisms of fracture and fatigue properties of well-dispersed alumina/epoxy nanocomposites10.1016/j.compscitech.2008.07.010 ↗
10. The fracture and fatigue behaviour of nano-modified epoxy polymers10.1007/s10853-007-1768-6 ↗
11. Fracture behaviour of fumed silica/epoxy nanocomposites10.1016/j.compositesa.2008.09.010 ↗
12. Fatigue of rubber-modified epoxies: effect of particle size and volume fraction10.1007/BF00352793 ↗
13. Improving interlaminar fracture toughness of carbon fibre/epoxy laminates by incorporation of nanoparticles10.1016/j.compositesb.2011.04.036 ↗
14. ASTM D5045-99. Standard test methods for plane-strain fracture toughness and strain energy release rate of plastic materials; 1999.
15. Review and extension of compliance information for common crack growth specimens10.1007/BF01390468 ↗
16. Fatigue crack closure under triaxial stress constraint—I. Experimental investigation10.1016/0013-7944(94)90009-4 ↗
17. Wang GT. On fracture toughness and fatigue resistance of polymer/nanoparticle composites. PhD Thesis. The University of Sydney; March 2010.
18. ASTM E647-08. Standard test method for measurement of fatigue crack growth rates; 2009.
19. Critical analysis of crack propagation laws10.1115/1.3656900 ↗
20. Micromechanics of rubber-toughened polymers10.1023/A:1004686708639 ↗
21. The effects of particle bulk modulus on toughening mechanisms in rubber modified polymers10.1002/pen.10346 ↗
22. A model of fatigue crack growth based on Dugdale model and damage accumulation
23. Analysis of fatigue crack growth in a rubber-toughened epoxy resin: effect of temperature and stress ratio10.1016/0032-3861(93)90180-I ↗