Effect of temperature on low velocity impact damage and post-impact flexural strength of cfrp assessed using ultrasonic c-scan and micro-focus computed tomography

Suvarna, R., Arumugam, V., Bull, D.J., Chambers, A.R. and Santulli, C. (2014) Effect of temperature on low velocity impact damage and post-impact flexural strength of cfrp assessed using ultrasonic c-scan and micro-focus computed tomography. Composites Part B: Engineering, 1- 22. (doi:10.1016/j.compositesb.2014.04.028).

Abstract

The effect of temperature on the low velocity impact resistance properties and on the post-impact flexural performance of CFRP laminates were studied. With this aim, 150x75 mm cross-ply carbon fibre/epoxy laminates with a [0/90/90/0]2s layup, therefore with a total of sixteen layers, were impacted at ambient temperature (30°C) and at elevated temperatures (55, 75 and 90?C) at a velocity of 2m/s using a drop weight impact tower. This was followed by flexural tests carried out at ambient temperature using a three-point bending rig. Damage assessment of impact and post-impact behaviour were carried out using ultrasonic C-scan and microfocus X-ray computed tomography (?CT). Interrupted flexural tests using ?CT allowed delamination propagation to be observed. In general, lower projected damage was observed at elevated temperatures, which resulted also in a possible hindrance to delamination and shear cracks propagation during impact and in a greater amount of retained flexural strength after impact.

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Contributors

Author: D.J. Bull

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