Showing papers by "Ajit Mal published in 2022"
TL;DR: In this article , a technique based on guided ultrasonic waves coupled with an uncertainty analysis based on fuzzy arithmetic is developed to quantify the nominal values of a inherent epistemic uncertainty in the material constants of quasi-isotropic fiber-reinforced composites.
6 citations
27 Jul 2022
TL;DR: In this article , the authors analyzed the convergence of guided waves in pipes to Lamb waves in plates for isotropic materials and defined a threshold frequency above which it is reasonable to approximate waves propagating in a pipe with a certain wall thickness to radius ratio as Lamb waves.
Abstract:
This work is concerned the with analysis of the convergence of guided waves in pipes to Lamb waves in plates for isotropic materials. The main goal is to be able to define a threshold frequency above which it is reasonable to approximate waves propagating in a pipe with a certain wall thickness to radius ratio as Lamb waves. The study involves a detailed comparison of velocity differences for symmetric and antisymmetric waves in plates versus longitudinal and flexural modes in pipes. Phase and group velocities of pipes with various wall thickness-to-radius ratios are compared to a plate of corresponding thickness. An empirical convergence criterion is defined to determine the frequency above which a pipe will have a plate-like response. It is shown that “convergence” may already be reached at frequencies commonly used for nondestructive testing purposes. Analytical considerations are supported and validated by experimental results, showing good agreement of predicted and measured wave velocities.