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Araldite® Demonstrates the Advantages of Ductility on Composite Single Lap Joints

Published on 2014-07-28. Author : SpecialChem

An Araldite® epoxy adhesive system from Huntsman Advanced Materials has been used in an experiment conducted by a research group, under the direction of Dr Trevor Young of the Irish Center for Composites Research at the University of Limerick, in which the bondline stress concentrations and the influence of adhesive ductility on composite single lap joints were investigated.

For the purposes of testing, the Center used and compared two epoxy paste adhesives, with the Araldite® system (Araldite® AW 4858 / HW 4858) offering relatively low tensile strength and high ductility and the other providing high tensile strength and low ductility.

Quasi-static tensile tests were conducted on single lap joints to failure at room temperature and local strain gradients in the adhesive fillet regions were analysed with high magnification two-dimensional digital image correlation. The fracture surfaces were also examined using scanning electron microscopy to identify plastic deformations and to understand the influence of adhesive ductility on joint failure.

Due to its relatively low tensile strength and high ductility, results showed that the Araldite® adhesive provided higher joint strength offering better stress distribution with lower adhesive stiffness prior to crack initiation and considerable local adhesive yielding with stress redistribution prior to joint failure.

Araldite® AW 4858 / HW 4858 is a room temperature curing black epoxy adhesive paste of high strength and toughness. It is suitable for bonding a wide variety of metals and is especially designed for bonding composites.

The Center’s article on the ‘Experimental Analysis of the Bondline Stress Concentrations to Characterise the Influence of Adhesive Ductility on the Composite Single Lap Joint Strength’ has also been published in The Journal of Adhesion.

About Huntsman

Huntsman Corporation is a publicly traded global manufacturer and marketer of differentiated chemicals with 2013 revenues of over $11 billion. Its chemical products number in the thousands and are sold worldwide to manufacturers serving a broad and diverse range of consumer and industrial end markets. The company operates more than 75 manufacturing and R&D facilities in over 30 countries and employ approximately 12,000 associates within our 5 distinct business divisions. .

Forward-Looking Statements

Statements in this release that are not historical are forward-looking statements. These statements are based on management's current beliefs and expectations. The forward-looking statements in this release are subject to uncertainty and changes in circumstances and involve risks and uncertainties that may affect the company's operations, markets, products, services, prices and other factors as discussed in the Huntsman companies' filings with the U.S. Securities and Exchange Commission. Significant risks and uncertainties may relate to, but are not limited to, financial, economic, competitive, environmental, political, legal, regulatory and technological factors. The company assumes no obligation to provide revisions to any forward-looking statements should circumstances change, except as otherwise required by applicable laws.

Source: Huntsman


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