TY - JOUR
T1 - Biaxial tensile failure of short carbon-fibre-reinforced PEEK composites
AU - Kang, Huaipu
AU - Qi, Lin
AU - Dang, Haoyuan
AU - Jin, Kanghua
AU - Thomson, Daniel
AU - Cui, Hao
AU - Li, Yulong
N1 - Publisher Copyright:
© 2021 Elsevier Ltd
PY - 2021/5/26
Y1 - 2021/5/26
N2 - The biaxial tensile failure of short carbon fibre reinforced polyether-ether-ketone (SCFR-PEEK) composites is characterized in this paper. An improved cruciform specimen was proposed to apply biaxial stresses, and five different stress ratios were employed in experiments. The stress distribution within the gauge section is not measurable across the varying stress ratios, therefore it is not trivial to obtain stress-strain data in the experiments. In this work, a combined experimental and numerical approach was proposed to deduce the true material behaviour during biaxial tensile tests. A numerical model with consideration of anisotropy and plasticity was proposed, it was further calibrated with uniaxial experiments and then validated with biaxial tests. Through this approach, the failure stress states at different stress ratios were successfully obtained. Compared with the numerical results based on constitutive relations, numerical results with linear elastic simplification overestimate the biaxial tensile strength, and are not suitable for material with an apparent nonlinear segment. The biaxial tensile failure envelope matches the Tsai-Hill criterion, and equal biaxial tensile results can be used for determining interaction coefficient F12 in the Tsai-Wu criterion. This research approach offers an accurate and reliable solution for biaxial tensile testing of materials with consideration of anisotropic and nonlinear behaviour.
AB - The biaxial tensile failure of short carbon fibre reinforced polyether-ether-ketone (SCFR-PEEK) composites is characterized in this paper. An improved cruciform specimen was proposed to apply biaxial stresses, and five different stress ratios were employed in experiments. The stress distribution within the gauge section is not measurable across the varying stress ratios, therefore it is not trivial to obtain stress-strain data in the experiments. In this work, a combined experimental and numerical approach was proposed to deduce the true material behaviour during biaxial tensile tests. A numerical model with consideration of anisotropy and plasticity was proposed, it was further calibrated with uniaxial experiments and then validated with biaxial tests. Through this approach, the failure stress states at different stress ratios were successfully obtained. Compared with the numerical results based on constitutive relations, numerical results with linear elastic simplification overestimate the biaxial tensile strength, and are not suitable for material with an apparent nonlinear segment. The biaxial tensile failure envelope matches the Tsai-Hill criterion, and equal biaxial tensile results can be used for determining interaction coefficient F12 in the Tsai-Wu criterion. This research approach offers an accurate and reliable solution for biaxial tensile testing of materials with consideration of anisotropic and nonlinear behaviour.
KW - Biaxial testing
KW - Failure envelope
KW - Finite element analysis (FEA)
KW - Non-linear behaviour
KW - Short-fibre composites
UR - http://www.scopus.com/inward/record.url?scp=85102840604&partnerID=8YFLogxK
U2 - 10.1016/j.compscitech.2021.108764
DO - 10.1016/j.compscitech.2021.108764
M3 - 文章
AN - SCOPUS:85102840604
SN - 0266-3538
VL - 208
JO - Composites Science and Technology
JF - Composites Science and Technology
M1 - 108764
ER -