國立虎尾科技大學 |

Low Speed Impact Testing and Non-Destructive Evaluation of IM7/Toughened Epoxy Quasi-isotropic Composite Panels.

紀錄類型:	書目-語言資料,手稿 : Monograph/item
正題名/作者:	Low Speed Impact Testing and Non-Destructive Evaluation of IM7/Toughened Epoxy Quasi-isotropic Composite Panels./
作者:	Giusti, Barbara.
面頁冊數:	1 online resource (89 pages)
附註:	Source: Masters Abstracts International, Volume: 85-06.
Contained By:	Masters Abstracts International85-06.
標題:	Aerospace engineering. -
電子資源:	click for full text (PQDT)
ISBN:	9798381169348

Low Speed Impact Testing and Non-Destructive Evaluation of IM7/Toughened Epoxy Quasi-isotropic Composite Panels.
Giusti, Barbara.

Low Speed Impact Testing and Non-Destructive Evaluation of IM7/Toughened Epoxy Quasi-isotropic Composite Panels. - 1 online resource (89 pages)

Source: Masters Abstracts International, Volume: 85-06.

Thesis (M.S.)--California State University, Long Beach, 2023.

Includes bibliographical references

This research presents the experimental and simulation results of a smart health monitoring system (SHM) using piezoelectric transducers to detect temperature and damage induced signal changes. Eight IM7 carbon/epoxy quasi-isotropic coupons were fabricated and then damaged with low speed impact velocities ranging from 1.73 m/s to 2.18 m/s. The signals were post-processed with a custom-made Matlab code and based on Lamb wave propagation analysis. A 45 V, 20 dB gain, 5-peak tone burst signal was transmitted at 250 kHz via an array of piezoelectric transducers (PZT) in a pitch-catch mode. PZTs were installed at the four edges of the coupons, and their signals were analyzed in the frequency and time domain. The identification and selection of a well-defined wave packet for each signal were used to acquire information on signal speed and its variation, phase shift, and changes in signal amplitude and power. Temperature-related signal changes were detected using peak amplitudes and time stamps information. Damage detection and related location identification were attempted by extrapolating information on wave packet velocity, damage index, illumination parameter, and peak power changes. The impact simulation and damage determination were performed via Abaqus using vendor-published engineering constants. These were validated by tensile and flexural tests on fabricated coupons as per ASTM Standard procedures. Possible manufacturing issues, post processing pitfalls, and the path forward are discussed.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2024

Mode of access: World Wide Web

ISBN: 9798381169348Subjects--Topical Terms:

686400
Aerospace engineering.
Subjects--Index Terms:

Low velocity impactIndex Terms--Genre/Form:

554714
Electronic books.

Low Speed Impact Testing and Non-Destructive Evaluation of IM7/Toughened Epoxy Quasi-isotropic Composite Panels.
LDR:02891ntm a22003737 4500 001 1145076
005 20240617111339.5
006 m o d
007 cr mn ---uuuuu
008 250605s2023 xx obm 000 0 eng d
020 $a 9798381169348
035 $a (MiAaPQ)AAI30419314
035 $a AAI30419314
040 $a MiAaPQ $b eng $c MiAaPQ $d NTU
100 1 $a Giusti, Barbara. $3 1470287
245 1 0 $a Low Speed Impact Testing and Non-Destructive Evaluation of IM7/Toughened Epoxy Quasi-isotropic Composite Panels.
264 0 $c 2023
300 $a 1 online resource (89 pages)
336 $a text $b txt $2 rdacontent
337 $a computer $b c $2 rdamedia
338 $a online resource $b cr $2 rdacarrier
500 $a Source: Masters Abstracts International, Volume: 85-06.
500 $a Advisor: Roy, Surajit.
502 $a Thesis (M.S.)--California State University, Long Beach, 2023.
504 $a Includes bibliographical references
520 $a This research presents the experimental and simulation results of a smart health monitoring system (SHM) using piezoelectric transducers to detect temperature and damage induced signal changes. Eight IM7 carbon/epoxy quasi-isotropic coupons were fabricated and then damaged with low speed impact velocities ranging from 1.73 m/s to 2.18 m/s. The signals were post-processed with a custom-made Matlab code and based on Lamb wave propagation analysis. A 45 V, 20 dB gain, 5-peak tone burst signal was transmitted at 250 kHz via an array of piezoelectric transducers (PZT) in a pitch-catch mode. PZTs were installed at the four edges of the coupons, and their signals were analyzed in the frequency and time domain. The identification and selection of a well-defined wave packet for each signal were used to acquire information on signal speed and its variation, phase shift, and changes in signal amplitude and power. Temperature-related signal changes were detected using peak amplitudes and time stamps information. Damage detection and related location identification were attempted by extrapolating information on wave packet velocity, damage index, illumination parameter, and peak power changes. The impact simulation and damage determination were performed via Abaqus using vendor-published engineering constants. These were validated by tensile and flexural tests on fabricated coupons as per ASTM Standard procedures. Possible manufacturing issues, post processing pitfalls, and the path forward are discussed.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2024
538 $a Mode of access: World Wide Web
650 4 $a Aerospace engineering. $3 686400
650 4 $a Mechanical engineering. $3 557493
653 $a Low velocity impact
653 $a Non-destructive evaluation
653 $a Piezoelectric transducers
653 $a Health monitoring system
655 7 $a Electronic books. $2 local $3 554714
690 $a 0538
690 $a 0548
710 2 $a ProQuest Information and Learning Co. $3 1178819
710 2 $a California State University, Long Beach. $b Mechanical and Aerospace Engineering. $3 1241255
773 0 $t Masters Abstracts International $g 85-06.
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=30419314 $z click for full text (PQDT)