Stress distribution in adhesive joints and evaluation of strength using acoustic emissionAdhesive joints 에서의 응력분포 및 acoustic emission 을 이용한 강도 평가

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Stress distribution, strength and the effects of eccentric load path in single-lap adhesive joints have been investigated. Also, the characteristics of acoustic emission with surface pretreatment and strength were studied for the evaluation of joint strength. In this work, aluminium alloy 2024-T3 clad was used as adherend material and Araldite AW 106(resin) & HV 953U(hardener) as adhesive material. The stress concentration in the joints with considering the bending moment was higher at both edges of overlap than that with neglecting it. The max. shear stresses showed nearly same value in the joints with same overlap length and different adherend thickness. On the other hand, the max. shear stress was increased with the increase of overlap length in the joints with same adherend thickness. This is considered to be caused by the different residual stress and plastic zone size. There were intimate relationships between surface pretreatment, shear strength, failure mode and the characteristics of Acoustic emission. The etched specimens showed the highest strength. The weaker the adhesive joints were, the more they released AE at earlier stage of load application. In addition, total AE release was higher in poor joints than in good joints at the same small load. The peak amplitude generated in strong adhesive joints was higher than that generated in weak adhesive joints. This was caused by the different modes of fracture (cohesive or adhesive).
Advisors
Kim, Ho-ChulLee, Choo-Chon김호철이주천
Description
한국과학기술원 : 기계공학과,
Publisher
한국과학기술원
Issue Date
1986
Identifier
65327/325007 / 000821940
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 기계공학과, 1986.2, [ xiii, 101 p. ]

URI
http://hdl.handle.net/10203/46713
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=65327&flag=dissertation
Appears in Collection
ME-Theses_Master(석사논문)
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