Accession Number : AD0716334

Title :   Collocated Interfacial Stress Intensity Factors for Finite, Bi-Material Plates,

Corporate Author : BALLISTIC RESEARCH LABS ABERDEEN PROVING GROUND MD

Personal Author(s) : Sawyer,Stephen Gerard

Report Date : SEP 1970

Pagination or Media Count : 35

Abstract : The paper examines elastic stress intensity factors associated with partially debonded interfaces in finite, bi-material plates. Bi-material stress intensity factors K(1) and K(2) are functions of an arbitrary length parameter; certainly any fracture condition involving bi-material stress intensity factors must be independent of a length parameter as in the homogeneous case. One defines a new quantity K(i) called the interfacial stress intensity factor which is independent of an arbitrary length parameter. A truncated Williams power series stress function for stresses in a cracked bi-material plate, as modified by Sih and Rice, is used with an improved boundary collocation procedure to generate interfacial stress intensity factors for finite bi-material plates. This modified collocation technique eliminates the need for tuning the boundary points. The method is exemplified by application to a centrally cracked bi-material plate and to a partially debonded composite laminate. (Author)

Descriptors :   (*STRUCTURAL MEMBERS, COMPOSITE MATERIALS), (*COMPOSITE MATERIALS, STRESSES), FRACTURE(MECHANICS), CRACKS, INTERFACES, LAMINATES, MATHEMATICAL ANALYSIS

Subject Categories : Laminates and Composite Materials
      Mechanics
      Solid State Physics

Distribution Statement : APPROVED FOR PUBLIC RELEASE