Delamination is one of the most common failure modes in composite structures. In the case of in-plane compressional loading, delamination of a layered flat structure can cause a local buckling in delaminated area which subsequently affects the overall stiffness of the initial structure. This leads to an early failure of the overall structure. Moreover, with an increase in load, the delaminated ...

The buckling and postbuckling behaviors of a composite beam with single delamination are investigated. A three-dimensional finite element model using the commercial code ANSYS is employed for this purpose. The finite elements analyses have been performed using a linear buckling model based on the solution of the eigenvalues problem, and a non-linear one based on an incremental-iterative method....

• PEI film inclusions improve the Mode I and II interlaminar toughness performance of CF/PEEK laminates. laminates toughened with at delamination susceptible ply interfaces exhibited superior impact relative to baseline a smaller damage footprint Unlike thermoset based composite laminates, all tested on surface. This is useful attribute in aerospace structures, where barely visible (BVID) conce...

Compressing a thin elastic film attached to a thick compliant substrate can lead to buckling instability. Two commonly observed buckling modes, buckle-delamination and wrinkling, have each been analyzed separately in previous studies. Recent experiments have observed that the two modes can co-exist and co-evolve. In this paper, by analytical and finite element methods, we present a study on con...

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Adhesive bonding community shows a continued interest in using bridging mechanisms to toughen the interface of secondary bonded joints, especially case laminated composites. Due snap-back instability that occurs during fracture, confusions may exist when identifying toughening effect experimentally. The true be overestimated by lumping all energy contributions (kinetic included) an overall effe...

The present work is focused on a comparative study of the effect Ti-Al interlayers and Ta alloying mechanical behavior Ti1−xAlxN coatings under normal contact pressure in-plane straining. loading samples was carried out by scratch testing, while tensile straining performed uniaxial tension coated steel substrates. Ti0.45Al0.55N Ti0.43Al0.45Ta0.12N monolithic as well Ti0.45Al0.55N/Ti0.45Al0.55 m...

In mode II interlaminar fracture toughness tests of composite laminates, the evaluated based on linear elastic mechanics deviates from true due to material nonlinearity matrix. this study, an elastoplastic finite-element analysis was performed a new quasi-static test, i.e., doubly end-notched tension (DENT) investigate difference between perceived energy release rate and J-integral. The effect ...