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Loading rate-induced transition in toughening mechanism of rubber-modified epoxy

Abadyan, M ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1080/00222341003595253
  3. Abstract:
  4. The effect of loading rate on toughening mechanisms of rubber-modified epoxy resin was investigated using amine-terminated butadiene acrylonitrile (ATBN) rubber. Rubber-modified samples were tested at various loading rates in the range of 1-1000 mm/min. At low loading rates, modified resin exhibited a high fracture toughness, which decreased by increasing the rate of loading. At higher loading rate a transition region was observed, where the fracture toughness did not change noticeably with increasing the loading rate. Beyond the transition region, the resin fracture toughness dropped dramatically to the level of unmodified epoxy. Fractography of the damage zone showed different toughening mechanisms for the various loading rate regions, i.e., shear yielding and crack branching. It is believed that the interaction between these two toughening mechanisms, each dominating in one extreme loading rate condition, is responsible for the intermediate transition region, where toughness is virtually independent from loading rate
  5. Keywords:
  6. Epoxy ; Transition ; Crack branching ; Damage zones ; Loading rate ; Low loading ; Modified epoxy ; Modified resin ; Rubber modification ; Rubber-modified epoxy resins ; Shear yielding ; Toughening mechanisms ; Transition regions ; Butadiene ; Epoxy resins ; Fractography ; Fracture ; Fracture mechanics ; Loading ; Resins ; Rubber ; Fracture toughness
  7. Source: Journal of Macromolecular Science, Part B: Physics ; Volume 49, Issue 3 , 2010 , Pages 602-614 ; 00222348 (ISSN)
  8. URL: http://www.tandfonline.com/doi/abs/10.1080/00222341003595253