355 nm high-reflective multilayer coatings with or without coevaporated interfaces (CEIs) were prepared by electron beam evaporation under the same deposition condition. Their transmission spectra, surface roughness, and mechanical stress properties were evaluated. Elemental composition analysis of the multilayer interfaces was performed using x-ray photoelectron spectroscopy, and laser-induced...

The purpose of present research is to estimate the damage of solid oxide fuel cell (SOFC) by using a new factor of acoustic emission (AE) during loading test. Acoustic emission signals and fracture processes were monitored by AE measurement system in real time during the test. In the investigation of fracture process with AE amplitude distributions, high-amplitude, middleamplitude and low-ampli...

This paper focuses on the effect of the drill geometry on the drilling of woven Carbon Fiber Reinforced Polymer composite (CFRPs). Although different geometrical effects can be considered in drilling CFRPs, the present work focuses on the influence of point angle and wear because they are the important factors influencing hole quality and machining forces. Surface quality was evaluated in terms...

Blistering, delamination, substrate deterioration Blistering, delamination, corrosion Blistering, reduced cohesion, film splitting, delamination Blistering, reduced cohesion, delamination, corrosion Blistering, intercoat delamination From components of paint film (e.g., inhibitive pigments, solvents, additives, etc.) From components of lower paint films (e.g., inhibitive pigments, solvents, add...

This paper discusses a new method for damage detection based on the most fundamental concept in continuum mechanics: strain compatibility. Compliance with this principle implies a deformed material is free from discontinuities, which are indicative of many types of structural damage. Therefore the principle of strain compatibility, in its ability to identify discontinuities, is very promising a...

A structural health monitoring system is developed for continuous online monitoring of delamination initiation and growth in composite structures. Structural health monitoring problems are often cast in the context of a statistical pattern recognition paradigm, in which a damage state of a structure is inferred by comparing test data with baseline data. However, subtle signal changes due to dam...

The characteristics of carbon fibre reinforced laminates have widened their use from aerospace to domestic appliances, and new possibilities for their usage emerge almost daily. In many of the possible applications, the laminates need to be drilled for assembly purposes. It is known that a drilling process that reduces the drill thrust force can decrease the risk of delamination. In this work, ...