Dynamic fiber debonding and frictional push-out in model composite systems: Experimental observations

Zhouhua Li, Xiaopeng Bi, John Lambros, Philippe H. Geubelle

Research output: Contribution to journalArticle

Abstract

In the present work a modified Split Hopkinson Pressure Bar (SHPB) system is adopted to perform dynamic fiber push-out experiments on model single fiber composite systems. A tapered punch and a support connect a monofilament composite with the incident and transmitted bars of the SHPB. The tapered punch is used to apply compressive loading to a single fiber (either steel or aluminum) embedded in a surrounding matrix material (EPON 862). The SHPB allows real time measurement of relative fiber/matrix displacement and push-out force, as the debonding and push-out event progresses. Using this technique we have studied the effect of loading rate, material mismatch, fiber length, and surface roughness on the push-out event. It was seen that maximum push-out force increases with increasing loading rate. In addition dynamic interfacial strength and toughness is highly dependent on fiber surface roughness. Results from a finite element analysis incorporating a cohesive failure model were used to extract interface strength and toughness values. It was found that the particular aluminum/EPON interface used is characterized by a dynamic shear failure strength of 48±8 MPa, a mode II fracture toughness of 160±40 N/m, and a friction coefficient of 0.2 at a sliding rate of 6 m/s. For the rates tested here these quantities were found to be approximately constant.

Original languageEnglish (US)
Pages (from-to)417-425
Number of pages9
JournalExperimental Mechanics
Volume42
Issue number4
DOIs
StatePublished - Dec 1 2002

Keywords

  • Debonding
  • Dynamic fiber push-out
  • Frictional sliding
  • Split Hopkinson Bar

ASJC Scopus subject areas

  • Aerospace Engineering
  • Mechanics of Materials
  • Mechanical Engineering

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