FINITE ELEMENT ANALYSIS OF QI CARBON/GLASS HYBRID LAMINATES SUBJECTED TO QUASI-STATIC INDENTATION USING 2D AXISYMMETRIC MODEL
Topic(s) : Material and Structural Behavior - Simulation & Testing
Co-authors :
An CHEN (UNITED KINGDOM), Xun WU (UNITED KINGDOM), Luiz KAWASHITA , Michael R. WISNOM (FRANCE)Abstract :
FINITE ELEMENT ANALYSIS OF QI CARBON/GLASS HYBRID LAMINATES SUBJECTED TO QUASI-STATIC INDENTATION USING 2D AXISYMMETRIC MODEL
An Chen*, Xun Wu, Luiz Kawashita, Michael R. Wisnom
* Bristol Composites Institute, University of Bristol, Bristol BS8 1TR, UK
e-mail: vk20927@bristol.ac.uk
Carbon fibre reinforced polymer (CFRP) materials is vulnerable to out-of-plane loading such as impact due to low strain to failure and through-thickness strength. The previous experimental work in [1] has shown that, hybrid laminates composed of carbon and high elongation fibres (e.g., glass fibre) have superior impact performance to that of CFRP. However, the underlying mechanisms for the improvements are not well understood. In this work, an efficient two-dimensional axisymmetric finite element model was established to simulate the response of the hybrid laminates proposed in [1] against quasi-static indentation for the aim of understanding the detailed damage mechanisms, the factors controlling the impact response of the laminates, as well as optimising the design of hybrid laminates under impact loading.
In the present 2D axisymmetric model, half of the through-thickness cross section of the laminates parallel to the fibre direction was constructed in ABAQUS/Explicit. The model was based on two-dimensional solid elements compatible with interface finite elements, which allows to model fibre failure and interlaminar delamination, respectively. Various material behaviours such as transverse nonlinear shear are taken in to account and their effects have been examined. The benefit of employing an axisymmetric model is that the through-thickness stresses obtained from it are particularly effective to be used for the analysis of local events like penetration, thus reducing the high computational cost presented in the state-of-the-art three-dimensional impact modelling.
The prediction for the baseline CFRP case has shown good agreement with experimental results (Fig.1), thus validating the axisymmetric assumption. This model provides an effective approach to study the penetration mechanisms, especially the interaction between fibre failure and delamination, which is hard to conduct in three-dimensional modelling. Parametric studies have also been undertaken to understand the relative effect of geometric and material properties on the laminate impact behaviour. The model is then extended to several proposed hybrid configurations to provide valuable guidelines for designing optimal hybrid composites for impact.
REFERENCES
[1]X. Wu, J. Finlayson, M.R. Wisnom, and S.R. Hallett. Improved energy absorption of novel hybrid configurations under static indentation. In: Proceedings of the 20th European conference on composite materials, Lausanne, 26-30 June 2022.
An Chen*, Xun Wu, Luiz Kawashita, Michael R. Wisnom
* Bristol Composites Institute, University of Bristol, Bristol BS8 1TR, UK
e-mail: vk20927@bristol.ac.uk
Carbon fibre reinforced polymer (CFRP) materials is vulnerable to out-of-plane loading such as impact due to low strain to failure and through-thickness strength. The previous experimental work in [1] has shown that, hybrid laminates composed of carbon and high elongation fibres (e.g., glass fibre) have superior impact performance to that of CFRP. However, the underlying mechanisms for the improvements are not well understood. In this work, an efficient two-dimensional axisymmetric finite element model was established to simulate the response of the hybrid laminates proposed in [1] against quasi-static indentation for the aim of understanding the detailed damage mechanisms, the factors controlling the impact response of the laminates, as well as optimising the design of hybrid laminates under impact loading.
In the present 2D axisymmetric model, half of the through-thickness cross section of the laminates parallel to the fibre direction was constructed in ABAQUS/Explicit. The model was based on two-dimensional solid elements compatible with interface finite elements, which allows to model fibre failure and interlaminar delamination, respectively. Various material behaviours such as transverse nonlinear shear are taken in to account and their effects have been examined. The benefit of employing an axisymmetric model is that the through-thickness stresses obtained from it are particularly effective to be used for the analysis of local events like penetration, thus reducing the high computational cost presented in the state-of-the-art three-dimensional impact modelling.
The prediction for the baseline CFRP case has shown good agreement with experimental results (Fig.1), thus validating the axisymmetric assumption. This model provides an effective approach to study the penetration mechanisms, especially the interaction between fibre failure and delamination, which is hard to conduct in three-dimensional modelling. Parametric studies have also been undertaken to understand the relative effect of geometric and material properties on the laminate impact behaviour. The model is then extended to several proposed hybrid configurations to provide valuable guidelines for designing optimal hybrid composites for impact.
REFERENCES
[1]X. Wu, J. Finlayson, M.R. Wisnom, and S.R. Hallett. Improved energy absorption of novel hybrid configurations under static indentation. In: Proceedings of the 20th European conference on composite materials, Lausanne, 26-30 June 2022.