Accession Number : AD0736834

Title :   Stresses in Laminated Composites Containing a Broken Layer. Part I. Analysis.

Descriptive Note : Technical rept.,

Corporate Author : CALIFORNIA UNIV SAN DIEGO LA JOLLA DEPT OF THE AEROSPACE AND MECHANICAL ENGINEERING SCIENCES

Personal Author(s) : Ashbaugh,Noel E.

Report Date : OCT 1971

Pagination or Media Count : 30

Abstract : The stress field around a stress-free crack in bimaterial laminated composite with elastic constituents is determined when the external loads open the crack surfaces. The crack is created by a broken layer and has a finite length. This problem is reduced to one in which the only nonzero boundary stress is a normal stress on the crack surface. The solution presented applies to a more general problem where either the normal displacement or the normal stress can be prescribed. The stresses are given by integral expressions which contain the derivative of the normal displacement along the crack surface. For the case when the normal stress is prescribed, a singular differential-integral equation is derived which the normal displacement of the crack surface must satisfy. The asymptotic behavior near the crack tips of the solution to the singular differential-integral equation is analyzed. Also a set of composite parameters is presented which provide some pertinent information for this crack problem. (Author-PL)

Descriptors :   (*COMPOSITE MATERIALS, *STRESSES), (*LAMINATES, COMPOSITE MATERIALS), LOADS(FORCES), CRACKS, ELASTIC PROPERTIES

Subject Categories : Laminates and Composite Materials

Distribution Statement : APPROVED FOR PUBLIC RELEASE