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Rate effects on the delamination fracture of multidirectional carbon-fiber/epoxy composites under mode I loading

Title
Rate effects on the delamination fracture of multidirectional carbon-fiber/epoxy composites under mode I loading
Author
최낙삼
Issue Date
2001-05
Publisher
Kluwer Academic Publishers
Citation
Journal of Materials Science, v. 36, no. 9, page. 2257–2270
Abstract
The present study has shown the experimental results for characterization of the mode I delamination fracture of continuous carbon fiber/epoxy multidirectional composites under a wide range of test rates, up to high rates of 11.4 m/s. At the slow rates of test ≤1.0 × 10−1 m/s the delamination fracture energy showed a rising “R-curve”, a strong function of the length of propagating crack due to the large extent of crack jumping and following fiber bridging. At the high rates of test ≥1.0 m/s any loads recorded by the load cell were largely obscured by such dynamic effects as “spring-mass” oscillations and flexural wave reflections. In this respect, Equation 11, requiring the values of the actual arm displacement and flexural (axial) modulus, was better for the deduction of G IC. However the maximum value of G IC so obtained was considerably underestimated. By increasing the rate up to 1.0 × 10−1 m/s, there were little differences in the delamination fracture behaviors, whereas at high rates >1.0 m/s the maximum values of G IC decreased considerably. In the case of a short initial crack length, however, the maximum values largely increased at a rate of 11.4 m/s.
URI
https://link.springer.com/article/10.1023%2FA%3A1017512605105https://repository.hanyang.ac.kr/handle/20.500.11754/158473
ISSN
0022-2461; 1573-4803
DOI
10.1023/A:1017512605105
Appears in Collections:
COLLEGE OF ENGINEERING SCIENCES[E](공학대학) > MECHANICAL ENGINEERING(기계공학과) > Articles
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