A new methodology to predict moisture effects on mechanical behaviors of GFRP-BALSA sandwich by acoustic emission and infrared thermography

This work focuses on moisture effects mechanical properties of GFRP-balsa sandwich structure experimentally and numerically. Firstly, relationships between Moisture Content (MC) Acoustic Emission (AE) wave velocity have been demonstrated by Hsu-Nielsen tests during the water immersion tests. And then, a new methodology was proposed to predict elastic modulus skin wet based relationship MC, AE modulus. Static 4-point bending were monitored InfraRed Thermography (IRT) verify good consistency stiffness reduction prediction method. Furthermore, Progressive Damage Analysis (PDA) model has developed introducing modified modulus, strength, as well fracture energy skin, quickly stiffness, load, displacement damage evolution process sandwich. Finally, it demonstrates that localization PDA concordance with observations IRT technique.