Measurement of the load-bearing capability of the fibre/matrix interface by single-fibre fragmentation

Measurement and analysis of stress transfer and toughness at a fiber–matrix interface

“…The average axial fiber stress, Ͻ j f Ͼ , is the same as that proposed by Tripathy and Jones 6 . The reduced average axial fiber stress, Ͻ j f Ͼ RED , is reported in order to emphasize the effect of the nature of the defect on the change of local stress transfer efficiency near the broken fiber end.…”

“…where Ͻ j f Ͼ is the average axial fiber stress. The imperfect interface parameter, D s 2 , and the cumulative stress transfer function, CSTF 6 , are obtained from analytical models that more precisely define this property. In many cases, interfacial damage is more complex than that assumed in available analytical models, for example, when combinations of interface debonding and matrix cracking occur, as shown in Figure 6.…”

“…The precise mode of failure is often a function of the environmental conditions and time, thus complicating the prediction of long-term behavior. A number of research groups have characterized the resistance to propagation of these defects by combining experimental observations of filament fracture in embedded single fiber microcomposites with either analytical solution or finite element analysis of the stress transfer and energy changes accompanying the fracture of an embedded filament [1][2][3][4][5][6][7][8][9] .…”

“…Interpretation of his analytical work also leads to the conclusion that ''damage zones'' are likely to extend a long distance from the broken fiber end, thus requiring the use of very large models to estimate adequately the total energy changes accompanying a fracture event at a broken fiber end. In addition, friction losses when the broken fiber retracts into the matrix 10 , acoustic energy losses generated by fracture events 11 , viscoelastic behaviour of the matrix 6 , and the kinetic energy of the moving cracks 12 all contribute to a complete energy balance. but are often ignored.…”

Three-phase model and digital image correlation to assess the interphase effect on the elasticity of carbohdyrate polymer-based composites reinforced with glass–silica beads

“…For example, Biliaderis, Lazaridou, and Arvanitoyannis (1999) have shown that Young's modulus of starch-based blends decreases when the water content in the material increases. The measurement of the interphase properties is accessible experimentally using classical methods such as pull out, push-out tests (Chandra & Ananth, 1995;Chandra & Ghonem, 2001;Nozawa, Katoh, & Snead, 2009) and fragmentation test (Johnson, Hayes, & Jones, 2009;Tripathi & Jones, 1997;Zhou, Wagner, & Nutt, 2001), particularly for fibre-reinforced materials. Local measurement based on indentation are also utilised preferentially for thin films (Chicot, Démarécaux, & Lesage, 1996;Dehm, Ruhle, Conway, & Raj, 1997;Ho & Dual, 1996;Kharrat, Chateauminois, Carpentier, & Kapsa, 1997;Lee, Wang, Pharr, & Xu, 2007;Li & Siegmund, 2004;Zhang, Chen, & Li, 2004;Zhu & Bartos, 1997).…”