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High Temperature and Environmental Effects on Polymeric Composites
ASTM Selected Technical Papers
High Temperature and Environmental Effects on Polymeric Composites
By
CE Harris
CE Harris
1
NASA Langley Research Center
,
Hampton, VA 23665
;
symposium co-chairmen and editors
.
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TS Gates
TS Gates
1
NASA Langley Research Center
,
Hampton, VA 23665
;
symposium co-chairmen and editors
.
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ISBN-10:
0-8031-1491-5
ISBN:
978-0-8031-1491-3
No. of Pages:
228
DOI:
https://doi.org/10.1520/STP1174-EB
Publisher:
ASTM International
Publication date:
1993
eBook Chapter

The Effect of the Interphase/Interface Region on Creep and Creep Rupture of Thermoplastic Composites

By
YS Chang
YS Chang
1
Graduate research assistant
, Material Engineering Science Program,
Virginia Polytechnic Institute and State University
,
Blacksburg, VA 24061
.
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,
JJ Lesko
JJ Lesko
2
Graduate research assistant
, Engineering Science and Mechanics Department,
Virginia Polytechnic Institute and State University
,
Blacksburg, VA, 24061
.
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,
KL Reifsnider
KL Reifsnider
3
Alexander F. Giacco professor
, Engineering Science and Mechanics Department,
Virginia Polytechnic Institute and State University
,
Blacksburg, VA 24061
.
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,
DA Dillard
DA Dillard
4
Associate professor
, Engineering Science and Mechanics Department,
Virginia Polytechnic Institute and State University
,
Blacksburg, VA 24061
.
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Doi:
https://doi.org/10.1520/STP18052S
Page Count:
21
  • Published:
    1993

The effect of the interphase/interface region on the creep and creep rupture behavior of thermoplastic (J2) composites was investigated. The mechanical properties of the J2 composites were altered by systematic changes in fiber surface characteristics. The three fiber surface variations investigated were: untreated AU4, electrochemical surface treated AS4(1) and (2), and surface treated/epoxy sized AS4CGP fiber. (AS4(1) and AS4(2) represent batch numbers.) For the same batch of the composites, the static mechanical properties, in general, ordered themselves from strong to weak as follows: AS4(2)/J2 > AS4CGP/J2 > AU4/J2. However, the creep rupture strength revealed a different ordering: AS4CGP/J2 > AS4(2)/J2 > AU4/J2. This indicates that good static mechanical properties may not dictate good long term mechanical performance. The creep rupture strength of the AS4(1)/J2 composites degraded about two times faster than the other three composites. Experimental results showed that the interphase/interface region did not affect the degradation rates of the creep rupture strength of the thermoplastic composites, but did influence the creep rupture strengths.

Keywords:
interphase, thermoplastic composites, meso-indentation, interfacial shear strength, creep, creep rupture

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