Three-Dimensional Analysis of Stress Concentrations Near Holes in Laminated Composites,

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Abstract:

Stress concentration factors are determined using a three-dimensional finite-element analysis for laminated composites pierced by circular, square and diamond-shaped holes. Both angel-ply and bidirectional laminates are investigated for hole size to width-of- strip ratios from 0.125 to 0.41. Normal stress concentrations are found to be the least for square holes and greatest for diamond-shaped holes. Interlaminar shear stress concentrations which cannot be determined by a two-dimensional analysis, are as large at the hole surface as those at the free edge when angle-ply laminates are utilized and the holes are large. For small circular holes, angle-ply or -45 LAMINATES ARE RECOMMENDED. When large holes are present, bidirectional 900 laminates are shown to be more efficient. Author-PL

Author(s):
Barker, Richard M. ; Dana, Jon R. ; Pryor, Charles W., Jr
Author Organization(s):
VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG COLL OF ENGINEERING
Supplementary Note:
Presented at ASCE Specialty Conference on Composite Materials, Pittsburgh, Pa., 13-14 Nov 72.
Pagination:
0032

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
VPI-E-72-27
Contract/Grant Number(s):
DAAF07-69-C-0444
 Subject Terms
Communities of Interest:
No COI(s) Identified
Descriptor(s):
(*COMPOSITE MATERIALS, STRESSES), LAMINATES, ORIFICES, NUMERICAL ANALYSIS
Field(s)/Group(s):
Laminates and Composite Materials
Keyword(s):
FINITE ELEMENT ANALYSIS, STRESS CONCENTRATION
Report Date:
1972 Dec 01