Title page for ETD etd-07082002-224733

Type of Document

Master's Thesis

Author

Peairs, Daniel M.

Author's Email Address

dpeairs@vt.edu

URN

etd-07082002-224733

Title

Development of a Self-Sensing and Self-Healing Bolted Joint

Degree

Master of Science

Department

Mechanical Engineering

Advisory Committee

Advisor Name	Title
Inman, Daniel J.	Committee Chair
Leo, Donald J.	Committee Member
Park, Gyuhae	Committee Member

Keywords

bolted joint
shape memory alloy
self-healing
impedance method
structural health monitoring
smart structures

Date of Defense

2002-07-03

Availability

unrestricted

Abstract

A self-sensing and self-healing bolted joint has been developed. This concept encompasses the areas of health monitoring, joint dynamics and smart materials. In order to detect looseness in a joint the impedance health monitoring method is used. A new method of making impedance measurements for health monitoring that greatly reduces the equipment cost and equipment size was developed. This facilitates implementation of the impedance technique in real-life field applications. Several proof of concept experiments are presented and compared to the traditional method of making impedance measurements.

Investigations of bolted joint dynamics were conducted. A literature review of bolted joints and their diagnostics is presented. The application of the transfer impedance method is compared to standard modal tests on various bolt tensions. An investigation of damping in bolted joints was also made comparing a bolted and monolithic beam.

Practical issues in adaptive bolted joints are investigated. This includes issues on activating/heating SMA actuators, connecting the actuators to the power source, size selection of SMA actuators and insulations. These issues are examined both experimentally and theoretically.

Files

Filename		Size	Approximate Download Time (Hours:Minutes:Seconds)
Filename		Size	28.8 Modem	56K Modem	ISDN (64 Kb)	ISDN (128 Kb)	Higher-speed Access
	01CoverandAbstract.pdf	53.42 Kb	00:00:14	00:00:07	00:00:06	00:00:03	< 00:00:01
	02Acknowledgements.pdf	49.19 Kb	00:00:13	00:00:07	00:00:06	00:00:03	< 00:00:01
	03TableofContents.pdf	64.98 Kb	00:00:18	00:00:09	00:00:08	00:00:04	< 00:00:01
	04Chapter1.pdf	348.97 Kb	00:01:36	00:00:49	00:00:43	00:00:21	00:00:01
	05Chapter2.pdf	711.13 Kb	00:03:17	00:01:41	00:01:28	00:00:44	00:00:03
	06Chapter3.pdf	315.81 Kb	00:01:27	00:00:45	00:00:39	00:00:19	00:00:01
	07Chapter4.pdf	401.06 Kb	00:01:51	00:00:57	00:00:50	00:00:25	00:00:02
	08Chapter5.pdf	60.23 Kb	00:00:16	00:00:08	00:00:07	00:00:03	< 00:00:01
	09References.pdf	83.13 Kb	00:00:23	00:00:11	00:00:10	00:00:05	< 00:00:01
	10AppendixA.pdf	75.65 Kb	00:00:21	00:00:10	00:00:09	00:00:04	< 00:00:01
	11Vita.pdf	48.00 Kb	00:00:13	00:00:06	00:00:06	00:00:03	< 00:00:01