Accession Number : ADA502862


Title :   A Feasibility Study into the Active Smart Patch Concept for Composite Bonded Repairs


Descriptive Note : Technical rept.


Corporate Author : DEFENCE SCIENCE AND TECHNOLOGY ORGANISATION VICTORIA (AUSTRALIA) AIR VEHICLES DIV


Personal Author(s) : Rajic, N ; Rosalie, S C


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a502862.pdf


Report Date : Aug 2008


Pagination or Media Count : 41


Abstract : This report describes an experimental investigation into a novel form of composite bonded repair called the Active Smart Patch (ASP). The ASP represents an important conceptual advancement over conventional repair technology by incorporating into a patch a network of embedded piezoelectric elements that provides a diagnostic facility for structural health. This type of repair is being developed as a means of mitigating the strict certification requirements currently placed on bonded repairs to primary aircraft structure, and as a potentially cost-efficient means of providing structural integrity assurance where lack of access precludes conventional nondestructive inspection. Initial development of the concept targets the problem of cracking at Forward Auxillary Spar Station (FASS) 281.28 in the F-111 Lower Wing Skin. As a first approximation to this problem, a prototype ASP was developed and then applied to a metal coupon which was notched to simulate cracking. The study shows that a network of piezoelectric transducers embedded in the bond-line of the patch provides a robust basis for the detection of notch growth.


Descriptors :   *COMPOSITE MATERIALS , NONDESTRUCTIVE TESTING , ACOUSTIC WAVES , CRACK PROPAGATION , STRUCTURAL INTEGRITY , BONDED JOINTS , PIEZOELECTRIC MATERIALS , AUSTRALIA , PIEZOELECTRIC TRANSDUCERS , SIGNAL PROCESSING , REPAIR


Subject Categories : Laminates and Composite Materials
      Mfg & Industrial Eng & Control of Product Sys


Distribution Statement : APPROVED FOR PUBLIC RELEASE