References and abstracts to PhD theses are also available, and some of the later publications can be downloaded in pdf format.

A review of the state of the art of guided waves for long range inspection is also available.

Citation

BibTex format

@article{Fan:2015:10.1109/TUFFC.2015.007018,
author = {Fan, Z and Mark, AF and Lowe, MJS and Withers, PJ},
doi = {10.1109/TUFFC.2015.007018},
journal = {IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL},
pages = {1530--1543},
title = {Nonintrusive Estimation of Anisotropic Stiffness Maps of Heterogeneous Steel Welds for the Improvement of Ultrasonic Array Inspection},
url = {http://dx.doi.org/10.1109/TUFFC.2015.007018},
volume = {62},
year = {2015}
}

RIS format (EndNote, RefMan)

TY  - JOUR
AB - —It is challenging to inspect austenitic welds nondestructivelyusing ultrasonic waves because the spatially varyingelastic anisotropy of weld microstructures can lead to thedeviation of ultrasound. Models have been developed to predictthe propagation of ultrasound in such welds once the weldstiffness heterogeneity is known. Consequently, it is desirableto have a means of measuring the variation in elastic anisotropyexperimentally so as to be able to correct for deviationsin ultrasonic pathways for the improvement of weld inspection.This paper investigates the use of external nonintrusiveultrasonic array measurements to construct such weld stiffnessmaps, representing the orientation of the stiffness tensor accordingto location in the weld cross section. An inverse modelbased on a genetic algorithm has been developed to recover asmall number of key parameters in an approximate model ofthe weld map, making use of ultrasonic array measurements.The approximate model of the weld map uses the Modeling ofanIsotropy based on Notebook of Arcwelding (MINA) formulation,which is one of the representations that has been proposedby other researchers to provide a simple, yet physicallybased, description of the overall variations of orientations ofthe stiffness tensors over the weld cross section. The choice ofsensitive ultrasonic modes as well as the best monitoring positionshave been discussed to achieve a robust inversion. Experimentshave been carried out on a 60-mm-thick multipasstungsten inert gas (TIG) weld to validate the findings of themodeling, showing very good agreement. This work shows thatultrasonic array measurements can be used on a single side ofa butt-welded plate, such that there is no need to access theremote side, to construct an approximate but useful weld mapof the spatial variations in anisotropic stiffness orientation thatoccur within the weld.
AU - Fan,Z
AU - Mark,AF
AU - Lowe,MJS
AU - Withers,PJ
DO - 10.1109/TUFFC.2015.007018
EP - 1543
PY - 2015///
SN - 0885-3010
SP - 1530
TI - Nonintrusive Estimation of Anisotropic Stiffness Maps of Heterogeneous Steel Welds for the Improvement of Ultrasonic Array Inspection
T2 - IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL
UR - http://dx.doi.org/10.1109/TUFFC.2015.007018
UR - http://hdl.handle.net/10044/1/28106
VL - 62
ER -