Accession Number:

ADA141826

Title:

Strength of Bolted Joints in Laminated Composites

Descriptive Note:

Final rept. Jun-Dec 1983

Corporate Author:

MICHIGAN UNIV ANN ARBOR DEPT OF MECHANICAL ENGINEERING AND APPLIED MECHANICS

Report Date:

1984-03-01

Pagination or Media Count:

176.0

Abstract:

A method is presented for predicting the failure strength and failure mode of pin-loaded holes in fiberite reinforced composite laminates. The method includes two steps. First, the stress distribution in the laminate is calculated by the use of a finite element method. Second, the failure load and failure mode are predicted by means of a proposed failure hypothesis together with the Yamada-Sun failure criterion. A computer code was developed, which can be used to calculate the maximum load and the mode of failure of joints involving laminates with different ply orientations, different material properties, and different geometries. Tests were performed, measuring the rail-shear strength and the characteristic lengths for Fiberite composites. Tests were also conducted, measuring the failure strengths and failure modes of Fiberite laminates containing a pin-loaded hole or two pin-loaded holes in parallel or in series. Comparisons were made between the data and the results of the model. Good agreement was found between the analytical and the experimental results. Using the computer code, parametric studies were performed, illustrating the procedures which can be used to size composites containing pin-loaded holes.

Subject Categories:

  • Laminates and Composite Materials
  • Numerical Mathematics
  • Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE