@article{chen_li_yuan_2013, title={Development of time-reversal method for impact source identification on plate structures}, volume={20}, ISSN={["1875-9203"]}, DOI={10.1155/2013/312169}, abstractNote={This paper presents a detailed study on the impact source identification of a plate structure using time-reversal (T-R) method. Prior to impact monitoring, the plate is calibrated (or characterized) by transfer functions at discrete locations on the plate surface. Both impact location and impact loading time-history are identified using T-R technique and associated signal processing algorithms. Numerical verification for finite-size isotropic plates under low velocity impacts is performed to demonstrate the versatility of T-R method for impact source identification. The tradeoff between accuracy of the impact location detection and calibration spacing is studied in detail. In particular, the effect of plate thickness on calibration spacing has been examined. A number of parameters selected for determining the impact location, approximated transfer functions and steps taken for reconstructing the impact loading time-history are also examined. Two types of noise with various intensities contaminated in strain response and/or transfer functions are investigated for demonstrating the stability and reliability of the T-R method. The results show that T-R method is robust against noise in impact location detection and force reconstruction in circumventing the inherent ill-conditioned inverse problem. Only transfer functions are needed to be calibrated and four sensors are requested in T-R method for impact identification.}, number={3}, journal={SHOCK AND VIBRATION}, author={Chen, Chunlin and Li, Yulong and Yuan, Fuh-Gwo}, year={2013}, pages={561–573} }
 @article{chen_peters_li_2013, title={Self-healing sandwich structures incorporating an interfacial layer with vascular network}, volume={22}, ISSN={["0964-1726"]}, DOI={10.1088/0964-1726/22/2/025031}, abstractNote={A self-healing capability specifically targeted for sandwich composite laminates based on interfacial layers with built-in vascular networks is presented. The self-healing occurs at the facesheet–core interface through an additional interfacial layer to seal facesheet cracks and rebond facesheet–core regions. The efficacy of introducing the self-healing system at the facesheet–core interface is evaluated through four-point bend and edgewise compression testing of representative foam core sandwich composite specimens with impact induced damage. The self-healing interfacial layer partially restored the specific initial stiffness, doubling the residual initial stiffness as compared to the control specimen after the impact event. The restoration of the ultimate specific skin strength was less successful. The results also highlight the critical challenge in self-healing of sandwich composites, which is to rebond facesheets which have separated from the core material.}, number={2}, journal={SMART MATERIALS AND STRUCTURES}, author={Chen, Chunlin and Peters, Kara and Li, Yulong}, year={2013}, month={Feb} }