Quantitative characterization of hypervelocity debris cloud-induced pitting damage in AL-whipple shields using nonlinear ultrasonic waves

Wuxiong Cao, Pengyu Zhou, Kai Wang, Yafeng Wang, Runqiang Chi, Baojun Pang, Zhongqing Su

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review

Abstract

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.

Original languageEnglish
Title of host publicationStructural Health Monitoring 2019
Subtitle of host publicationEnabling Intelligent Life-Cycle Health Management for Industry Internet of Things (IIOT) - Proceedings of the 12th International Workshop on Structural Health Monitoring
EditorsFu-Kuo Chang, Alfredo Guemes, Fotis Kopsaftopoulos
PublisherDEStech Publications Inc.
Pages2247-2254
Number of pages8
ISBN (Electronic)9781605956015
Publication statusPublished - 1 Jan 2019
Event12th International Workshop on Structural Health Monitoring: Enabling Intelligent Life-Cycle Health Management for Industry Internet of Things (IIOT), IWSHM 2019 - Stanford, United States
Duration: 10 Sep 201912 Sep 2019

Publication series

NameStructural 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
Volume2

Conference

Conference12th International Workshop on Structural Health Monitoring: Enabling Intelligent Life-Cycle Health Management for Industry Internet of Things (IIOT), IWSHM 2019
CountryUnited States
CityStanford
Period10/09/1912/09/19

Keywords

  • HVI
  • SHM

ASJC Scopus subject areas

  • Computer Science Applications
  • Health Information Management

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