| About this Abstract |
| Meeting |
2024 ASC Technical Conference, US-Japan Joint Symposium, D30 Meeting
|
| Symposium
|
2024 ASC Technical Conference, US-Japan Joint Symposium, D30 Meeting
|
| Presentation Title |
Breaking the Wavelength Barrier for Precursor Damage Estimation in Composite Structures Using Nonlinear Ultrasonics |
| Author(s) |
Hossain Ahmed, Sourav Banerjee |
| On-Site Speaker (Planned) |
Sourav Banerjee |
| Abstract Scope |
Detection of damage nucleation in Carbon Fiber Reinforced Polymer (CFRP) composite at a scale lower than the inspection frequency is presented herein. In ultrasonic technology, traditionally, inspection wave frequency must be smaller than the damages or defects to be estimated. Therefore, in estimating precursor damage in CFRP composites, high frequency ultrasonic waves are employed, which has a limitation to travel longer distance. In this work, it has been shown that by decoding non-linearity in conventional low frequency guided wave, it is possible to estimate damage nucleation in CFRP composite structures during the first 20% of their operational life. During this life span of CFRP composites, damages nucleate in the form of voids and fiber breakage which are smaller than the comparable ultrasonic wavelength. In this experimental study, CFRP composite specimens are prepared from four-layer woven composite plates and tensile-tensile fatigue loadings are applied to induce precursor damage in three stages. After each stage of fatigue loading, an 8-hour relaxation is maintained when ultrasonic waves are transmitted and received as Rayleigh Lamb wave and P-wave form. By analyzing higher order non-linearity in both low frequency guided wave and high frequency P-wave, the growth of precursor damage in CFRP composite structures are assessed. It has been found that the higher order non-linearity ultrasonics can predict the damage growth with acceptable accuracy despite the order of damages are smaller than the ultrasonic wave lengths. This prediction is further validated by experimentally determining the remaining strength of the CFRP composite specimens. |
| Proceedings Inclusion? |
Definite: Post-meeting proceedings |