TY - GEN
T1 - Quantitative characterization of hypervelocity debris cloud-induced pitting damage in AL-whipple shields using nonlinear ultrasonic waves
AU - Cao, Wuxiong
AU - Zhou, Pengyu
AU - Wang, Kai
AU - Wang, Yafeng
AU - Chi, Runqiang
AU - Pang, Baojun
AU - Su, Zhongqing
PY - 2019/1/1
Y1 - 2019/1/1
N2 - In a typical Whipple shield for protecting spacecraft from hypervelocity impact (HVI), the debris cloud, formed by the shattered material of the outer bumper layer, commits multitudinous, disorderedly scattered pitting craters and cracks over a wide region in the rear wall layer. Material degradation due to the pitting damage is a precursor of structural fragmentation and system failure. In this study, microscopic material degradation of the rear wall layer in a typical dual-layered Whipple shield, initiated and intensified by the debris cloud-engendered pitting damage, is characterized using metallographic analysis. Diverse microstructure changes (e.g., refined grains, dislocation, micro-voids and micro-cracks) are observed, accompanying the generation of visible macro-scale pitting craters, and intensification of material plasticity and nonlinearity. In addition to the material nonlinearity in the vicinity of pitting craters, micro-voids and micro-cracks are also developed which distort propagation of probing guided ultrasonic waves GUWs, thereby triggering acoustic nonlinearity. Targeting at the evaluation and monitoring of this sort of pitting damage, an insight into the generation of high-order modes in GUWs is achieved, and then validated via experiment. On this basis, a monitoring and evaluation framework based on the lead zirconate titanate (PZT) network, in conjunction with the use of the developed nonlinear damage indices, is developed, whereby the hypervelocity debris cloud-induced pitting damage can be depicted and characterized quantitatively and precisely.
AB - In a typical Whipple shield for protecting spacecraft from hypervelocity impact (HVI), the debris cloud, formed by the shattered material of the outer bumper layer, commits multitudinous, disorderedly scattered pitting craters and cracks over a wide region in the rear wall layer. Material degradation due to the pitting damage is a precursor of structural fragmentation and system failure. In this study, microscopic material degradation of the rear wall layer in a typical dual-layered Whipple shield, initiated and intensified by the debris cloud-engendered pitting damage, is characterized using metallographic analysis. Diverse microstructure changes (e.g., refined grains, dislocation, micro-voids and micro-cracks) are observed, accompanying the generation of visible macro-scale pitting craters, and intensification of material plasticity and nonlinearity. In addition to the material nonlinearity in the vicinity of pitting craters, micro-voids and micro-cracks are also developed which distort propagation of probing guided ultrasonic waves GUWs, thereby triggering acoustic nonlinearity. Targeting at the evaluation and monitoring of this sort of pitting damage, an insight into the generation of high-order modes in GUWs is achieved, and then validated via experiment. On this basis, a monitoring and evaluation framework based on the lead zirconate titanate (PZT) network, in conjunction with the use of the developed nonlinear damage indices, is developed, whereby the hypervelocity debris cloud-induced pitting damage can be depicted and characterized quantitatively and precisely.
KW - HVI
KW - SHM
UR - http://www.scopus.com/inward/record.url?scp=85074296593&partnerID=8YFLogxK
M3 - Conference article published in proceeding or book
AN - SCOPUS:85074296593
T3 - Structural Health Monitoring 2019: Enabling Intelligent Life-Cycle Health Management for Industry Internet of Things (IIOT) - Proceedings of the 12th International Workshop on Structural Health Monitoring
SP - 2247
EP - 2254
BT - Structural Health Monitoring 2019
A2 - Chang, Fu-Kuo
A2 - Guemes, Alfredo
A2 - Kopsaftopoulos, Fotis
PB - DEStech Publications Inc.
T2 - 12th International Workshop on Structural Health Monitoring: Enabling Intelligent Life-Cycle Health Management for Industry Internet of Things (IIOT), IWSHM 2019
Y2 - 10 September 2019 through 12 September 2019
ER -