AE Technique for Identification of Micro Failure Modes in CFRP Composites

Computational modeling of micro-crack induced attenuation in CFRP composites

A computational study is performed to determine the contribution to ultrasound attenuation in carbon fiber reinforced polymer composite laminates of linear elastic scattering by matrix micro-cracking. Multiple scattering approximations are benchmarked against exact computational approaches. Results support linear scattering as the source of observed increased attenuation in the presence of micr...

Effects of hygrothermal stress on the failure of CFRP composites

This paper investigates the hygrothermal effects on the failure mechanisms in bending of carbon fibre reinforced polymer (CFRP) composites. Accelerated diffusion testing was carried out by immersion at 50°C constant temperature and 70 bar hydrostatic pressure to study the effects of fresh or sea water diffusion into pre-preg CFRP laminates. Consequently the composite laminates were tested in be...

Waveform Analysis of Ae in Composites

Advanced, waveform based acoustic emission (AE) techniques have been developed to evaluate damage mechanisms in the testing of composite materials. This approach, more recently referred to as Modal AE, provides an enhanced capability to discriminate and eliminate noise signals from those generated by damage mechanisms. Much more precise source location can also be obtained in comparison to conv...

NDT of free formed CFRP composites with laser ultrasonics

In recent years the use of carbon fiber reinforced plastics (CFRP) in manufacturing of aircraft and auto cars has increased continually. These materials are of interest because of their excellent mechanical properties like high strength and stiffness at low weight. In consequence of the development of new production processes machine-made CFRP components became more complex in design and shape....

Simulation of Characteristic of Linear Degradation with Failure Modes