An analytical investigation is conducted to predict the post-buckling strength of laminated composite stiffened panels under compressive loads. When a stiffened composite panel buckles, the skin would deform into a sinusoidal mode shape, and hence induces additional moments and forces near the skin-stiffener interface region. These induced loads would cause the existing small edge delamination ...

Drilling is one of the important machining processes in hole making operations. Delamination is a vital problem during any drilling operation. It causes structural integrity reduction and poor assembly tolerance as well as potential for long-term performance deterioration. As a result, drilling of any material requires dimensional stability and interface quality. In this study, glass fibre rein...

The wrinkling and delamination of stiff thin films adhered to a polymer substrate have important applications in "flexible electronics." The resulting periodic structures, when used for circuitry, have remarkable mechanical properties because stretching or twisting of the substrate is mostly accommodated through bending of the film, which minimizes fatigue or fracture. To date, applications in ...

The goal of this project is to develop a new NDT technique/algorithm based on Lamb waves, in which damage can be detected “without relying on past reference data.” In particular, a NDT methodology will be formulated for detecting defects such as crack, corrosion and delamination commonly found in aircraft. The proposed concept of “reference-free” damage diagnosis attempts to address some of the...

Impact damage characteristics and compression after edge-on impact (CAEI) strength of CFRP laminates were experimentally investigated. with various thicknesses stacking sequences prepared. tests a constant energy level performed using the special fixtures. The damaged areas their shapes on evaluated an ultrasonic C-scanning machine. It was observed that thickness affected delamination shape, wh...

An analysis is made of contact damage in brittle coatings on metal substrates, using a case study of a dental porcelain coating of thickness between 0.1 and 1 mm fused onto a Pd alloy base, with spherical indenter of radii 2.38 and 3.98 mm. At large coating thicknesses (>300 mm), the first damage takes the form of surface-initiated transverse cone cracks outside the contact. At small coating th...

The use of laminate composites in structures is under a considerable increase. The advantages of their use are related with a considerable weight reduction and consequent improvement of dynamic characteristics, in the case of aeronautics, automobile, railway and naval industries. Some applications of these materials in sports are already well known, like cycling, motor sports or golf, just to m...

Two state-of-the-art analytical compression after impact (CAI) modelling approaches are presented and evaluated for the problem of thin-film buckle-driven propagation a delamination in composite laminates. Characteristic phenomena investigated by evaluating behaviour energy release rate an anisotropic sublaminate above 2D embedded delamination. These characteristics include extension-bend, shea...