JEC COMPOSITES MAGAZINE - Issue #101 - November/December 2015 - 37

Fig. 4: The evolution of interface strength under hygrothermal ageing

continuously with ageing time for both composites and continues
decreasing after one year of ageing, indicating the progressive damage to the interface caused by hygrothermal ageing. The interface
strength retention of pDCPD composites is 60% after one year of
ageing.
During thermo-oxidative ageing, the static tensile properties of
the pDCPD composites were stable, illustrating the exceptional
resistance of pDCPD to thermo-oxidative ageing. Figure 5 shows
a comparison of τapp values from fibres situated far beneath the
surface exposed during ageing ("bulk") and from fibres situated
near the exposed surface ("near-surface"). The value of τapp for
near-surface fibres decreased substantially during ageing because
of surface oxidation (dropped to 37% after 16 weeks). In contrast,
the τapp for bulk fibres was 97% for the same ageing treatment,
indicating that they were largely unaffected by oxidation. Clearly,
high-temperature oxidation degraded the interface strength more
severely than thermal ageing alone.

Fig. 5: The evolution of interface strength under thermal oxidation ageing

Ageing of polymer-matrix composites (PMCs) is a major concern
for structural durability in aggressive service environments. The
present study demonstrates that pDCPD composites exhibit exceptional resistance to both hygrothermal ageing and thermo-oxidative
ageing. These characteristics are well-suited to potential applications, including wind energy structures, offshore oil platforms, oil
pipelines, and both land and marine vehicles. However, before such
composites can be deployed in these applications, investigations are
required to understand other types of ageing and associated damage mechanisms, such as ultraviolet exposure, freeze-thaw cycling,
creep and high pressure. In most practical applications, multiple
types of ageing occur concurrently and the effects couple, resulting
in complex interactions and uncertain longevity. n
Acknowledgements
Support from Materia, Inc. is gratefully acknowledged.
More information:
http://composites.usc.edu

ln 2016, JEC Atlanta offers you the possibility to speak at several end-user forums: aeronautics, automotive, building and construction,
land transportation, marine, wind energy, automation, environment & recycling, natural fibres, biocomposites and more.
So count your company in and be a speaker too!

May 3, 20l6

Challenges of the glass fibre industry

Novelties in thermoset resins

May 4, 20l6

Automotive: lower processing costs

Thermoplastics materials in the aeronautics industry

May 5, 20l6

3D printing

Poster Session (Automotive focus)

JEC Americas: Atlanta 20l6
(Apply online before December l4, 20l5 at www.jeccomposites.com/events/jec-conferences-atlanta-2016)

No101 November - December 2015 /

jec composites magazine 37


http://composites.usc.edu http://www.jeccomposites.com/events/jec-americas-2016-atlanta/

Table of Contents for the Digital Edition of JEC COMPOSITES MAGAZINE - Issue #101 - November/December 2015

Cover
Edito
Point of view : Developing advice
Contents
COMPANY & BUSINESS
In brief
Agenda of Events
APPLICATIONS
Golf
Sustainability
Bicycle
Mountain
MARKET
Japan
Brazil
FEATURE BUILDING & CONSTRUCTION
Floor
Antibacterial
Medical
Graphene
Design
Environment
RESEARCH & DEVELOPMENT
Ageing
Welding
Welding
Simulation
TECHNOLOGY & INNOVATIONS
Process
Green composites
Nano
Compound
Index
In the world
JEC COMPOSITES MAGAZINE - Issue #101 - November/December 2015 - Cover
JEC COMPOSITES MAGAZINE - Issue #101 - November/December 2015 - 2
JEC COMPOSITES MAGAZINE - Issue #101 - November/December 2015 - Edito
JEC COMPOSITES MAGAZINE - Issue #101 - November/December 2015 - Point of view : Developing advice
JEC COMPOSITES MAGAZINE - Issue #101 - November/December 2015 - 5
JEC COMPOSITES MAGAZINE - Issue #101 - November/December 2015 - Contents
JEC COMPOSITES MAGAZINE - Issue #101 - November/December 2015 - 7
JEC COMPOSITES MAGAZINE - Issue #101 - November/December 2015 - In brief
JEC COMPOSITES MAGAZINE - Issue #101 - November/December 2015 - 9
JEC COMPOSITES MAGAZINE - Issue #101 - November/December 2015 - Agenda of Events
JEC COMPOSITES MAGAZINE - Issue #101 - November/December 2015 - 11
JEC COMPOSITES MAGAZINE - Issue #101 - November/December 2015 - Ad1
JEC COMPOSITES MAGAZINE - Issue #101 - November/December 2015 - Ad2
JEC COMPOSITES MAGAZINE - Issue #101 - November/December 2015 - Golf
JEC COMPOSITES MAGAZINE - Issue #101 - November/December 2015 - Sustainability
JEC COMPOSITES MAGAZINE - Issue #101 - November/December 2015 - Bicycle
JEC COMPOSITES MAGAZINE - Issue #101 - November/December 2015 - 15
JEC COMPOSITES MAGAZINE - Issue #101 - November/December 2015 - Mountain
JEC COMPOSITES MAGAZINE - Issue #101 - November/December 2015 - 17
JEC COMPOSITES MAGAZINE - Issue #101 - November/December 2015 - Japan
JEC COMPOSITES MAGAZINE - Issue #101 - November/December 2015 - Brazil
JEC COMPOSITES MAGAZINE - Issue #101 - November/December 2015 - 20
JEC COMPOSITES MAGAZINE - Issue #101 - November/December 2015 - Floor
JEC COMPOSITES MAGAZINE - Issue #101 - November/December 2015 - 22
JEC COMPOSITES MAGAZINE - Issue #101 - November/December 2015 - Antibacterial
JEC COMPOSITES MAGAZINE - Issue #101 - November/December 2015 - Medical
JEC COMPOSITES MAGAZINE - Issue #101 - November/December 2015 - Graphene
JEC COMPOSITES MAGAZINE - Issue #101 - November/December 2015 - 26
JEC COMPOSITES MAGAZINE - Issue #101 - November/December 2015 - 27
JEC COMPOSITES MAGAZINE - Issue #101 - November/December 2015 - 28
JEC COMPOSITES MAGAZINE - Issue #101 - November/December 2015 - Design
JEC COMPOSITES MAGAZINE - Issue #101 - November/December 2015 - 30
JEC COMPOSITES MAGAZINE - Issue #101 - November/December 2015 - Environment
JEC COMPOSITES MAGAZINE - Issue #101 - November/December 2015 - 32
JEC COMPOSITES MAGAZINE - Issue #101 - November/December 2015 - 33
JEC COMPOSITES MAGAZINE - Issue #101 - November/December 2015 - 34
JEC COMPOSITES MAGAZINE - Issue #101 - November/December 2015 - Ageing
JEC COMPOSITES MAGAZINE - Issue #101 - November/December 2015 - RESEARCH & DEVELOPMENT
JEC COMPOSITES MAGAZINE - Issue #101 - November/December 2015 - 37
JEC COMPOSITES MAGAZINE - Issue #101 - November/December 2015 - Welding
JEC COMPOSITES MAGAZINE - Issue #101 - November/December 2015 - 39
JEC COMPOSITES MAGAZINE - Issue #101 - November/December 2015 - Welding
JEC COMPOSITES MAGAZINE - Issue #101 - November/December 2015 - 41
JEC COMPOSITES MAGAZINE - Issue #101 - November/December 2015 - 42
JEC COMPOSITES MAGAZINE - Issue #101 - November/December 2015 - 43
JEC COMPOSITES MAGAZINE - Issue #101 - November/December 2015 - Simulation
JEC COMPOSITES MAGAZINE - Issue #101 - November/December 2015 - 45
JEC COMPOSITES MAGAZINE - Issue #101 - November/December 2015 - 46
JEC COMPOSITES MAGAZINE - Issue #101 - November/December 2015 - 47
JEC COMPOSITES MAGAZINE - Issue #101 - November/December 2015 - 48
JEC COMPOSITES MAGAZINE - Issue #101 - November/December 2015 - 49
JEC COMPOSITES MAGAZINE - Issue #101 - November/December 2015 - Process
JEC COMPOSITES MAGAZINE - Issue #101 - November/December 2015 - 51
JEC COMPOSITES MAGAZINE - Issue #101 - November/December 2015 - Green composites
JEC COMPOSITES MAGAZINE - Issue #101 - November/December 2015 - 53
JEC COMPOSITES MAGAZINE - Issue #101 - November/December 2015 - Nano
JEC COMPOSITES MAGAZINE - Issue #101 - November/December 2015 - 55
JEC COMPOSITES MAGAZINE - Issue #101 - November/December 2015 - Compound
JEC COMPOSITES MAGAZINE - Issue #101 - November/December 2015 - Index
JEC COMPOSITES MAGAZINE - Issue #101 - November/December 2015 - In the world
JEC COMPOSITES MAGAZINE - Issue #101 - November/December 2015 - 59
JEC COMPOSITES MAGAZINE - Issue #101 - November/December 2015 - 60
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