Persico uses Araldite adhesive for racing yacht

ITALIAN YACHT MAKER PERSICO HAS USED A HUNTSMAN ADVANCED MATERIALS ADHESIVE IN THE BUILD OF A NEW DESIGN OF VOLVO OPEN 70 RACING YACHT FOR THE ABU DHABI TOURISM AUTHORITY.

Built by Persico at its Nembro site in Italy, the ‘Abu Dhabi’ is a 70 ft long vessel which is designed to weigh less, and be more robust, than other yachts in its class.

To achieve the high levels of component endurance and performance required to compete in demanding yacht races, Persico has used Huntsman Advanced Materials' Araldite® AW4859 / Hardener HW4859 adhesive to complete the yacht. The adhesive fixes together different highly loaded components, from bonding titanium fittings to the yacht’s carbon structure, to assembling the hatch, rudder bearing sleeves and components, bow sprit, chain-plate, mast and keel structure.

Araldite AW4859 / Hardener HW4859 is a new structural adhesive designed for composite bonding. It is also suitable for bonding dissimilar substrates such as metals or thermoplastics. According to Huntsman, the key features of this adhesive are its sag resistance, gap filling properties up to 4 mm, high temperature resistance (140°C) and good moisture and chemical resistance.

The adhesive is also said to exhibit outstanding fracture toughness and lap shear strengths up to 35 MPa on carbon and glass fibre reinforced plastics.

“We selected Araldite AW4859 / Hardener HW4859 for its proven ability to deliver outstanding performance to marine applications," explains Mark Somerville from Persico.

"When it comes to delivering the exact levels of stiffness required to ensure the ‘Abu Dhabi’ performs well in racing conditions, Araldite® AW4859 / Hardener HW4859 is certainly living up to our expectations. We have been particularly impressed with its shear strength, coupled with its ability to withstand heavy loads, intensive strain and extreme conditions, as well as its bonding properties to the components and substrates on our racing yacht.”

Another Huntsman adhesive, Araldite420 A/B is used to bond many other details on the boat.

Aluminium mesh is used as the infill to make security door, grille, fence and partition as illustrated in the the photos of this posting.

It can also be used for making machinery guards, security enclosures, decorative cum security screens, open air shelves and etc.

There are numerous benefits in choosing the aluminium mesh for the above mentioned usage/ purpose, namely, anti-rust, fire proof, vermin proof, good visibility, easy passage of air and light while ensuring security and protection.

What are Refractory Materials?

There was a time when I would simply pull out my trusty Webster’s Tome. I would efficiently thumb to the desired entry, proudly making full use of the alphabetical skills acquired through years of primary education. Voila! Having quickly located the desired term, I would faithfully and obediently parrot the appropriate definitions. But times have changed, and I have kept up with them. I now depend, as I’m sure is true for most of us, on Google and Wikipedia for my primary didactic guidance.

So I Googled “Refractory”.

Webster could never have anticipated the boundless diversity of definition declared relative by Google’s algorithms! You may enjoy looking for yourself, but let me assure you that for our purposes, refractory is not “the recovery phase after orgasm during which it is physiologically impossible for an individual to have additional orgasms” http://en.wikipedia.org/wiki/Refractory_period(sex)

And did you know that in the religion of the Vedic period in India, there are certain words that, when used as a Mantra, affect a spiritual transformation in the individual repeating them? Om (or Aum) is perhaps the most well known. The meaning of the words (and the self) becomes lost in the rhythm of repetition. The void that this loss creates invites change and hopefully an accompanying enlightenment. 

How in the world did I get from “Refractory” to refractory Karmas? The Six Degrees of Separation of People states that each person on Earth is only 6 acquaintances from every other person. I’d like to be the first to declare a similar relationship for information, my just conceived and soon to be famous Six Clicks of Separation of Information theory, each topic searched for is only 6 clicks away from all other topics

I’m tempted yet again to abandon this new hyperlink knowledge fest and dust off my trusted old tome. But I never do. I love this new world of fast and easy information. I love having the world’s largest library sitting on my desk. Maybe I won’t become famous for my theory, but I’ll bet one day I’ll learn to use technology as efficiently as that old dictionary.

In the mean time, you’ll have to read more of the blog to know what our discussion is all about. Since I already know, I’m just going to go practice my mantra. “Aum refractory, Aum refractory, Aum refractory…”

Greg Gorby, Editor

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High Temperature Resonant Ultrasound Spectroscopy: A Review

High Temperature Resonant Ultrasound Spectroscopy: A Review
Department of Physics and Astronomy, National Center for Physical Acoustics, The University of Mississippi, MS 38677, USA Received 6 August 2010; Accepted 24 November 2010 Academic Editor: Jaan Laane Copyright © 2010 G. Li and J. R. Gladden. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Abstract The measurement of elastic constants plays an important role in condensed matter physics and materials characterization. This paper presents the resonant ultrasound spectroscopy (RUS) method for the determination of elastic constants in a single crystal or amorphous solid. In RUS, the measured resonance spectrum of a properly prepared sample and other information such as geometry, density, and initial estimated elastic constants are used to determine the elastic constants of the material. We briefly present the theoretical background and applications to specific materials; however, the focus of this review is on the technical applications of RUS, especially those for high-temperature measurements. 1. Introduction: Elastic Constants and Measurement Methods The elastic response of a solid is determined by the full set of independent elastic constants, which are a measure of the material’s interatomic forces and, specifically, the curvature of the potentials around the equilibrium spacing. Elastic constants are a sensitive probe into the atomic environment of a crystal lattice, and changes in elastic constants are a useful tool for investigating critical phenomenon. Elastic constants are involved in many fundamental phenomena in solid-state physics: they are important parameters in equations of state, lattice dynamics, and phonon spectra; they are also linked to other quantities in thermodynamics such as coefficient of thermal expansion, Debye temperature, Grüneisen parameter, and so on. The measurement of elastic constants is of interest not only to engineers and materials scientists, but also to researchers in many areas of fundamental and applied physics. Numerous theoretical and experimental methods are available for evaluating elastic constants. If the equation for the interatomic potential is known, the elastic constant can be calculated from first principles. The results from ab initio calculations for some crystalline solids with known atomic structures and potentials are usually in reasonable agreement with the experimental data. For simple, accurate and efficient determination of elastic properties of materials, various ultrasonic and nonultrasonic experimental techniques are often preferred. Many experimental techniques [1–3] have been developed and employed for measuring the elastic constants of different types of materials. The selection of technique depends on factors such as the composition, structural characteristic and size of the sample, desired accuracy of measurement, and, of course, the availability of equipment and expertise. Various common techniques can be roughly categorized according to the major parameters that are evaluated or the primary equipment that are used (Table 1). The accuracy of a given experimental method depends on many factors other than the fundamental nature of the method itself. However, frequencies are one of the easiest quantities to measure, and resonance methods typically depend on many more frequency measurements than variables being determined. For these reasons, RUS has emerged as one of the most accurate methods for elastic constant measurements.

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Please find below our selection of Aluminium Mesh by Aperture sizes.

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