In the present work, the interaction of Rayleigh waves with a delamination in a fiber reinforced composite plate was analyzed. Rayleigh waves, upon interacting with delamination mode, convert into Lamb waves in the delamination zone. These guided Lamb modes have the capability to mode convert back into Rayleigh modes when they interact with the edge of the delamination. A unidirectional glass/e...

Drilling-induced delamination often occurs both at the entrance and the exit of the workpiece during drilling of composite material. Investigators have studied analytically and experimentally that delamination in drilling can be correlated to the thrust force of the drill. With a pre-drilled pilot hole, the delamination can be reduced significantly. Early reference reported models of drilling-i...

A study was undertaken using electrochemical impedance spectroscopy to measure delamination and compare that measurement, which can be performed on the sample repeatedly, with the accepted method of cathodic disbondment (CD) testing, the major drawback of which is that this measurement can only be done once on the sample; in reaching this goal, EIS could be used to predict delamination based on...

The susceptibility of QFN package to delamination, particularly in the area between the Ni/Pd/Au leadframe die pad and mold compound, has been a major concern to many IC manufacturers. The presence of a Ni/Pd/Au oxide layer on the leadframe of QFN packages was found to cause delamination at the die pad or mold compound interface. Delamination refers to the disbonding between a surface of the mo...

The mechanisms of failure a composite sandwich structure subjected to projectile impact have been investigated. results reveal the complex interplay between various damage dissipation mechanisms. effects modifying matrix skins with polysiloxane core–shell rubber (CSR) nanoparticles and silica were Single cantilever beam specimens tested evaluate skin-core debonding. addition CSR beyond 3 wt% ca...

This paper addresses the characterisation of mode I interlaminar fracture toughness a carbon fibre/epoxy composite material, toughened with thermoplastic particles in ply interlayers. The is undertaken at −55 °C, 19 and 90 on both dry fully moisture saturated coupons. Fractographic observations delamination surfaces allows identification failure mechanisms. propagation tested wet/90 °C exhibits...

in this research, b4c-ni cermet coating was sprayed on the surface of 4130 steel from b4c and ni feed-stockpowders using high velocity oxy-fuel (hvof) method. in order to characterize the tribological behavior of thecoating, ball on disk wear tests were done at the ambient temperature and under the loads of 1, 3 and 5 n.phase analysis of the coating after spraying was studied by x-ray diffracto...

Interleaving thermoplastic veils has proved to enhance the interlaminar fracture toughness of carbon fibre/epoxy composites under static loading conditions. However, fatigue delamination behaviour yet be investigated. Herein, meltable Polyamide-12 (PA) and non-meltable Polyphenylene-sulphide (PPS) were used for interlay toughening unidirectional (UD) non-crimp fabric (NCF) laminates that manufa...

Coordination of neural crest cell (NCC) induction and delamination is orchestrated by several transcription factors. Among these, Sry-related HMG box-9 (Sox9) and Snail2 have been implicated in both the induction of NCC identity and, together with phoshorylation, NCC delamination. How phosphorylation effects this function has not been clear. Here we show, in the developing chick neural tube, th...

It is difficult to detect delamination of rotating composite components like helicopter and wind turbine blades while in-service with a wired system. In the present study, a wireless system using a tiny oscillation circuit for detecting delamination of carbon/epoxy composites is proposed. In this system, a tiny oscillation circuit is attached to the composite component. When delamination of the...