Accession Number : ADA184823

Title :   NDE (Nondestructive Evaluation) of Adhesive Bonds. Phase 1.

Descriptive Note : Final rept. 15 Sep 86-31 May 87,

Corporate Author : TEXAS RESEARCH INST INC AUSTIN

Personal Author(s) : Teller, Cecil M ; Diercks, K J

PDF Url : ADA184823

Report Date : 11 Aug 1987

Pagination or Media Count : 56

Abstract : This report describes the results of a successful effort to demonstrate the feasibility of using leaky Lamb waves to detect and delineate flaws in the bond surface of metal/rubber laminates, even when adherends remain in intimate contact. It is shown that the leaky Lamb wave method can detect and image a poorly bonded surface when conventional pulse-echo method failed even to detect the flaw. A new technique was implemented for preparing partially bonded surfaces by varying the percentage of adhesive coverage, and results are provided that illustrate the sensitivity of the leaky Lamb wave method in detecting different surfaces prepared by this technique. An analytical model of the leaky Lamb wave phenomenon in homogenous, isotropic metal/rubber laminates is described. Numerical results for a metal/rubber laminate immersed in water are included.

Descriptors :   *ADHESIVE BONDING, *SONAR TRANSDUCERS, *LAMINATES, ACOUSTIC WINDOWS, BONDED JOINTS, CURING, NONDESTRUCTIVE TESTING, ACOUSTIC REFLECTION, ULTRASONIC TESTS, FOURIER SPECTROSCOPY, ANISOTROPY, DEFECTS(MATERIALS), SALT WATER, RUBBER COATINGS, RUBBER SEALS, METALS, BOUNDARY LAYER, INTERFACES, COMPOSITE MATERIALS, NEOPRENE

Subject Categories : Adhesives, Seals and Binders
      Laminates and Composite Materials
      Acoustic Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE