The edge crack torsion (ECT) test is designed to initiate mode III delamination growth in composite laminates. An ECT specimen is a rectangular laminate, containing an edge delamination at the laminate mid-plane. Torsion load is applied to the specimens, resulting in relative transverse shear sliding of the delaminated faces. The test data reduction schemes are intended to yield initiation valu...

assessment of the correlation between rock brittleness and rock fracture toughness has been the subject of extensive research works in the recent years. unfortunately, the brittleness measurement methods have not yet been standardized, and rock fracture toughness cannot be estimated satisfactorily by the proposed indices. in the present study, statistical analyses are performed on some data col...

This article introduces stiff and tough biocomposites with in-situ polymerisation of poly (methyl methacrylate) ductile non-dry flax fibres. According to the results, composites processed fibres (preconditioned at 50% RH) had comparable quasi-static in-plane shear strength but 42% higher elongation failure toughness than oven-dried Interestingly, perforation energy flax–PMMA cross-ply subjected...

Improvement of the interfacial fracture toughness layer interfaces is one way to increase performance interlayer hybrid laminates containing standard thickness carbon/epoxy plies and make them fail in a stable, progressive way. The were interleaved with thermoset 913 type epoxy or thermoplastic acrylonitrile–butadienestyrene (ABS) films introduce beneficial energy absorption mechanisms promote ...

Interlaminar fracture toughness in carbon fiber reinforced plastics has been studied primarily using unidirectional or symmetric laminates. However, even quasi-isotropic laminates, delamination caused by an out-of-plane impact could result asymmetric, partial Thus, evaluating the interlaminar asymmetric particularly that of Mode II associated with resistance, is necessary. Asymmetric laminates ...

When a piezoelectric film is glued on the surface of a structure member subjected to mechanical load, a distribution of electric potential is induced. In the existence of defects in the member, a characteristic variation of electric potential is observed. Based on this phenomenon, the passive electric potential CT (computed tomography) method is developed for detecting and identifying defects i...

Composite laminates are prone to delamination. Implementation of delamination in the Carrera Unified Formulation frame work using nine noded quadrilateral MITC9 element is discussed in this article. MITC9 element is devoid of shear locking and membrane locking. Delaminated as well as healthy structure is analysed for free mode vibration. The results from the present work are compared with the a...

Delamination is one of the most common defects in laminate composite materials. To detect delaminations, different non-destructive test methods such as infrared thermography methods are currently widespread for non-destructive inspection, recommended for evaluating composite materials mostly in the active variant. The principle behind infrared thermography consists in highlighting the relevant ...