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Articles with Abstracts

Fiber bundle push-out test and image-based finite element simulation for 3D carbon/carbon composites
Carbon 50 #8 (2012)
Sharma, Mahajan and Mittal of the Indian Institute of Technology Delhi, India, conducted push-out tests on 3D C/C composites and the experimental results were fitted to the shear lag model to determine these interfacial properties.  The fiber bundle and matrix interfaces were observed as being partially damaged in the tomographic images and the crack network was explored in detail. The tomographic images were also used to reconstruct a finite element (FE) mesh for simulating push-out tests.  The simulations had a good agreement with experiments and values of 0.75 for coefficient of friction, 25 N/mm2 for debond stress, 14 N/mm2 for clamping stress and 36 N/m for fracture energy release rate were obtained as interfacial parameters for the composite. (RDC 4/25/2012)

Transmission electron microscopy study of the microstructure of carbon/carbon composites reinforced with in situ grown carbon nanofibers
Carbon 50 #7 (2012)
Liu, XueFeng and Xiao of the Chinese Academy of Sciences and Central South University, China,  including carbon nanofibers (CNFs) in carbon/carbon (C/C) composites is an effective method to improve the mechanical properties of C/C composites.  In situ grown CNFs reinforced C/C composites as well as conventional C/C composites without CNFs were fabricated by chemical vapor infiltration.  Transmission electron microscopy investigations indicate that the entangled CNFs (30120 nm) formed interlocking networks on the surface of carbon fibers (CFs). Moreover, a thin high-textured (HT) pyrocarbon (PyC) layer (
20 nm) was deposited on the surface of CFs during the growth of CNFs. We find the microstructure of C/C composites depends strongly on the local distribution density (LDD) of CNFs. In regions of low CNF LDD, a triple-layer structure was formed. The inner layer (attached to CF) is HT PyC (20 nm), the middle layer (150200 nm) is composed of HT PyC coated CNFs (HT/CNFs) and medium-textured PyC, and the outmost layer (several microns) is composed of HT/CNFs and micropores. In regions of high CNF LDD, a double-layer structure was formed. The inner layer is HT PyC (20 nm), and the outer layer is composed of HT/CNFs, isotropic PyC and nanopores. However, only medium-textured PyC and micropores were found in the matrix of the conventional C/C composites.  (RDC 3/29/2012)


Roger D. Corneliussen

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Copyright 2012 by Roger D. Corneliussen.
No part of this transmission is to be duplicated in any manner or forwarded by electronic mail without the express written permission of Roger D. Corneliussen

* Date of latest addition; date of first entry is 3/29/2012.