期刊
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
卷 56, 期 -, 页码 8-26出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesa.2013.09.007
关键词
Fibres; Thermoplastic resin; Rheological properties; Forming
资金
- ThermoPlastic composites Research Center (TPRC)
- Region Twente and the Gelderland & Overijssel team for the TPRC
- GO Programme EFRO
Intra-ply shear appears during the forming process of hot thermoplastic laminates with a uni-directional fibre reinforcement. This paper proposes a torsion bar test to characterise the longitudinal shear mechanism, which can be performed with a standard rheometer. Sensitivity analyses showed that most reliable shear property measurements can be obtained by using torsion bar specimens with a close to square cross section. The method is implemented in practise and critically evaluated. Storage and loss moduli were determined for carbon UD/PEEK specimens at high temperatures. Non-linear material behaviour was found for relatively small shear strains. The linear regime was focussed on subsequently, where the characteristics were found to be similar to that of a visco-elastic solid or weak gel, confirmed by a dominant storage modulus and a weak frequency dependency. Future work is recommended to be focussed on the large strain regime, for which this paper provides a found basis. (C) 2013 Elsevier Ltd. All rights reserved.
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