Abstract
Composite components regularly experience dynamic loads in service. Despite this, it is still difficult to obtain accurate mechanical properties of composite materials under high strain rate conditions. In this study, a new application of the Image-Based Inertial Impact (IBII) test methodology was developed, to generate an accurate in-plane transverse and shear moduli dataset from unidirectional (UD) off-axis composite specimens. The obtained dataset was consistent across different sample configurations, where results from the UD45^{circ } off-axis specimens agreed well with the UD90^{circ } values. Validation of the shear modulus identification was also undertaken by comparing the results from the UD90^{circ } and UD45^{circ } specimens with a multi-directional (MD) configuration. Here, it was found that MD±45^{circ } specimen shear modulus values where marginally lower than that from the UD specimens, in accordance with the lower fibre volume fraction of the MD laminate. Low strain rate sensitivities in the 0.5-2times10^{3} hbox {s}^{-1} regime evidenced in this work suggest previously published data (often from split-Hopkinson bar tests) may include both a material and system i.e. testing apparatus response.
Highlights
There are many examples of composite components being subjected to dynamic loads
The final mean G12 value of 4.73 GPa obtained at an average shear strain rate of 1.1×10−4 s−1 was consistent with that in [2], which was obtained from MD±45◦ specimens made from the same material
The transverse stress gauge approach used to obtain the transverse modulus from UD45◦ specimens had previously been evaluated with a single UD45◦ Carbon Fibre Reinforced Polymer (CFRP) specimen in [30]
Summary
There are many examples of composite components being subjected to dynamic loads. In the aerospace industry, aircraft nose caps, wings and rear stabilisers can be impacted by a range of objects such as birds, hail or ice and runway debris. The simulation’s ability to predict a realistic structural response hinges largely on the accuracy of the data used in the individual material models specified for the component. This is especially true for fibre reinforced polymer composite materials, where the resin dominant (i.e. transverse and shear) properties are generally considered rate sensitive [1]. Not all CFRP composites investigated utilised the same matrix system and some variation due to resin chemistry was expected
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