Damage measurements in epoxy structural adhesives using microhardness

Damage measurements in epoxy structural adhesives using microhardness The design of adhesively joined components requires the ability to predict and model the joint response under expected operating conditions, including crash events for vehicle structures. Specifically, quantifying adhesive material damage accumulation from static and dynamic loading is essential to predict the response of bonded components in such scenarios. In this study, Vickers microhardness measurements were used as a forensic technique to quantify damage in bulk tensile samples for three structural epoxy adhesive materials: an untoughened epoxy; a toughened epoxy; and a high toughness epoxy. The samples were tested to failure over a range of strain rates (0.002–100 s−1), and hardness measurements were taken post-test along the gauge length. In general, for toughened epoxies the damage extended over much of the sample gauge length, while the un-toughened epoxy demonstrated damage localization at the failure location. The hardness data support the contention that mechanisms such as crazing and shear banding play a role in microhardness changes in toughened epoxies. Increments in strain rate led to an increase in the damage localization. Microhardness measurements were a valuable tool to quantify damage, with the limitation that the magnitude of change in hardness could be adhesive-specific, hypothesized to be related to competing damage mechanisms. The benefits of this approach include the ability to spatially quantify damage, to detect strain rate effects and to carry out measurement of damage post-test in support of constitutive modeling and failure analysis. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png International Journal of Adhesion and Adhesives Elsevier

Damage measurements in epoxy structural adhesives using microhardness

Loading next page...
 
/lp/elsevier/damage-measurements-in-epoxy-structural-adhesives-using-microhardness-xyMn0QHh87
Publisher
Elsevier
Copyright
Copyright © 2018 Elsevier Ltd
ISSN
0143-7496
D.O.I.
10.1016/j.ijadhadh.2018.01.014
Publisher site
See Article on Publisher Site

Abstract

The design of adhesively joined components requires the ability to predict and model the joint response under expected operating conditions, including crash events for vehicle structures. Specifically, quantifying adhesive material damage accumulation from static and dynamic loading is essential to predict the response of bonded components in such scenarios. In this study, Vickers microhardness measurements were used as a forensic technique to quantify damage in bulk tensile samples for three structural epoxy adhesive materials: an untoughened epoxy; a toughened epoxy; and a high toughness epoxy. The samples were tested to failure over a range of strain rates (0.002–100 s−1), and hardness measurements were taken post-test along the gauge length. In general, for toughened epoxies the damage extended over much of the sample gauge length, while the un-toughened epoxy demonstrated damage localization at the failure location. The hardness data support the contention that mechanisms such as crazing and shear banding play a role in microhardness changes in toughened epoxies. Increments in strain rate led to an increase in the damage localization. Microhardness measurements were a valuable tool to quantify damage, with the limitation that the magnitude of change in hardness could be adhesive-specific, hypothesized to be related to competing damage mechanisms. The benefits of this approach include the ability to spatially quantify damage, to detect strain rate effects and to carry out measurement of damage post-test in support of constitutive modeling and failure analysis.

Journal

International Journal of Adhesion and AdhesivesElsevier

Published: Apr 1, 2018

References

You’re reading a free preview. Subscribe to read the entire article.


DeepDyve is your
personal research library

It’s your single place to instantly
discover and read the research
that matters to you.

Enjoy affordable access to
over 12 million articles from more than
10,000 peer-reviewed journals.

All for just $49/month

Explore the DeepDyve Library

Unlimited reading

Read as many articles as you need. Full articles with original layout, charts and figures. Read online, from anywhere.

Stay up to date

Keep up with your field with Personalized Recommendations and Follow Journals to get automatic updates.

Organize your research

It’s easy to organize your research with our built-in tools.

Your journals are on DeepDyve

Read from thousands of the leading scholarly journals from SpringerNature, Elsevier, Wiley-Blackwell, Oxford University Press and more.

All the latest content is available, no embargo periods.

See the journals in your area

DeepDyve Freelancer

DeepDyve Pro

Price
FREE
$49/month

$360/year
Save searches from
Google Scholar,
PubMed
Create lists to
organize your research
Export lists, citations
Read DeepDyve articles
Abstract access only
Unlimited access to over
18 million full-text articles
Print
20 pages/month
PDF Discount
20% off