The effect of an interphase on the stress and energy distribution in the embedded single fibre test

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

“…The stress profiles and the change in elastic strain energy associated with debonding and matrix cracking accompanying a filament fracture are evaluated using an axisymmetrical finite element (FE) model similar to that previously reported 4,[9][10][11]13,14 . The fragmentation process is modeled as a cylinder of matrix material surrounding a single filament fragment of length, L (Figure 1).…”

Nanostructured Interphases and Multiscale Effects in the Forming of Composite Micro-Rods

“…2). DiAnselmo et al [9] showed that the interphase may infl uence the stress and energy distribution in the embedded single-fi ber specimens. In the fi ber-reinforced epoxy matrix composites, the interphase thickness may vary from a few nanometers to a few microns, depending on the fi ber coating [10].…”

“…Ho and Drzal [15] reviewed earlier studies of interphases and pointed out the importance of local stresses on interphase performance. Interphases having appropriate Young's moduli, Poisson's ratios, and thickness were found to be useful for tailoring bulk properties and reducing stress concentration near interfaces [9,11]. Interfacial debonding is also infl uenced by the interface properties [16,17].…”

“…e mechanical properties of a composite micro-rod with a single embedded fi ber, its transverse modulus, and its fracture toughness may be also aff ected by the fi ber/ matrix interphase, as the studies of DiAnselmo [9] and Harik [18] suggest. Moreover, the secondary processing and press forming of composites or the net-shape forming of micromechanical systems (e.g., MEMS) is dependent on the global and local response under transverse loading.…”

Fibre/resin interaction in fragmentation tests: coaxial vs. simple specimens comparison

“…If we accept that changing the surface treatments of carbon fibres does affect the stress transfer relative to the same tough reference resin, we may assume that a resin coating, albeit a very thin one, should modify the stress transfer relative to the same carbon fibre surface. A number of models dealing with the coaxial geometry have been described in the literature, including their application to the fragmentation test (Termonia, 1990;Di Anselmo et al, 1992;Monette et al, 1993;Jones, 1996). We present in this paper only experimental results and a very simplified validation.…”