Marie Christine Lafarie-Frenot

Effect of carbon nanotubes on the thermoelectric properties of CFRP laminate for aircraft applications

The present paper focuses on the thermoelectric behavior of carbon nanotube-charged carbon fiber-reinforced polymer composite materials for aircraft applications. Two types of samples: Type A with carbon nanotube and Type B without carbon nanotube), and with two different stacking sequences (unidirectional—[0]8, cross orthogonal—[0/90]4) were manufactured for the thermoelectric experiments, DC electrical current was injected through the specimens, and the temperature of the specimens was monitored simultaneously in order to deduce the effect of carbon nanotube on the electrical conductivity change of the specimen. During the test, transient and steady temperature fields were measured on the sample surfaces by infrared thermography, and real-time voltage measurements monitor the sample electrical resistance. The results show that the presence of carbon nanotube produces increasing values of longitudinal electric conductivity σ L of about 10%. At 9 A, the maximum temperature value is around 95℃ for unidirectional and 145℃ for cross orthogonal samples. The presence of carbon nanotube tends to decrease the entire range of maximum temperatures, about 7% on average for the unidirectional and about 4% on average for cross orthogonal samples.

Some Examples of “Multi-Physical” Fatigue of Organic Matrix Composites for Aircraft Applications

This paper presents, discusses and review some recent results concerning the interaction between mechanics and the environment during fatigue tests carried out under accelerated environmental conditioning of laminated and woven Organic Matrix Composites (OMC) for high temperature aircraft parts, the synergy between electrical and mechanical fields during electro-mechanical fatigue of composite laminates for fuselage applications the damage behavior of 3D woven OMC under thermal cycling.For all case studies, the capabilities of the PPRIME Institute to perform such tests reproducing “multi-physical” fatigue environment and characterizing the phenomenology associated to multi-physics coupling at several scales will be highlighted. The main issues related to the development of “multi-physics” models for proper interpretation of test results are also reviewed.