Interlaminar fracture is useful for product development and material selection furthermore, a measurement of the mode i interlaminar fracture toughness, independent of specimen ge-ometry or method of load introduction, is useful for establish-ing design allowables used in damage tolerance analyses of composite structures made from these materials.
The analysis of interlaminar fracture in uniaxial fibre-polymer composites article (pdf available) in proceedings of the royal society a 427(1872):173-199 january 1990 with 230 reads. The intralaminar and interlaminar mode-i fracture-toughness of a unidirectional im7/8552 graphite/epoxy composite were measured using compact tension (ct) and double cantilever beam (dcb) test specimens, respectively.
The inter-ply characteristics of polymeric prepreg composites influence their interlaminar fracture toughness and the overall performance this article embarks on engineering the inter-ply interfaces of carbon fiber reinforced polymer (cfrp) composites a novel and practical technique for dispersion. Intralaminar and interlaminar progressive failure analyses of composite panels with circular cutouts of delamination from the edge of the cutout at a location perpendicular to the loading axis was identified as the major cause for catastrophic failure of the panels nonself-similar delamination growth, delamination arrest, and closure of. The analysis of interlaminar fracture in uniaxial fibre-polymer composites proc r soc lond a 1990 427: 173 – 199 google scholar, crossref, isi: 24. Therefore, a detailed literature survey is presented on mode i and mode ii testing, and mixed mode testing is reviewed briefly mode i testing the most commonly used test for if[ characterization in mode i is the dcb test the dcb test was aplied previously for testing adhesives and interlaminar fracture of composites based on glass fibres.
Interlaminar fracture major failure in polymer composites its development hugely weaken the stiffness of a composite structure, which can lead to the failure during service  and also it hugely affected the performance of laminated composite. Other mechanisms of reinforcement due to the cnts beyond fiber bridging include: polymer hysteretic effects such as crazing, cnt fracture, or cnt bending as they are pulled out of the matrix (the cnts are radially-aligned, not perpendicular to the crack plane, and also are not straight/collimated but rather wavy , .
It was shown that the nanofibril mat was responsible for a major interlaminar fracture toughness improvement, as high as 255–322%, compared to a non‐interleaved carbon/epoxy baseline composite which was attributed to its interfacial failure the propagation mode i interlaminar fracture toughness of both composites increased up to 152%. Several fracture modes in polymer composites such as delamination or interlaminar fracture, matrix cracking or intralaminar fracture, matrix-fiber debonding, fiber breaking, fiber pullout etc  in the fiber reinforced polymer composite, the matrix absorbs energy in tearing while the high strength fibers break by brittle cleavage [4.
T, exceeds the interlaminar fracture toughness, g c although several different types of test specimens have also been suggested for the measurement of the mode iii interlaminar fracture toughness property, an interaction criterion incorporating the scissoring shear, however, has not yet been established and remains a challange. The significant role of the interlaminar fracture in the failure mechanism of composites is reflected by the large number of articles published in this field 1-19 in these works fracture fibre type effect on mixedmode i/ii interlaminar fracture in polymer composites (2) where v f is the fibre volume fraction (v f is defined as the ratio of. Polymer matrix composites, particularly in the form of laminates, have become established as engineering materials in many failure critical applications, for example in aerospace, in transport generally and in chemical plant. Polymer composite materials usually indicate a mixture of brittle and ductile failure processes there a few fracture modes in polymer composites failure such as fiber breaking, intralaminar fracture or matrix cracking, matrix-fiber debonding, fiber pullout, interlaminar fracture or delamination, and etc .