Identification of Materials Mechanical Properties from Full-Field Measurements: Latest Advances in the Virtual Fields Method

Pierron, Fabrice

doi:10.4028/www.scientific.net/amm.13-14.3

Cited by 2 publications

(1 citation statement)

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“…Ongoing requirements in pursuit of consistent high strain rate data for orthotropic composites have called for new experimental methods to be developed. New techniques based on full-field measurements have emerged [14,23], with a recent example being the Image-Based Inertial Impact (IBII) test described in [24][25][26]. The IBII test uses ultra-high speed imaging, fullfield measurements and the Virtual Fields Method (VFM) to obtain material properties under dynamic loads by using the inertial response of the material as a kind of embedded load-cell.…”

Section: Introductionmentioning

confidence: 99%

The Off-Axis IBII Test for Composites

Parry

Fletcher

Pierron

2020

J. dynamic behavior mater.

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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 $$0.5-2\times$$ 0.5 - 2 × 10$$^{3}$$ 3 $$\hbox {s}^{-1}$$ 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.

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