SYMPOSIA PAPER Published: 01 January 1988

Analytical and Experimental Investigation of the Notched Strength of Thick Laminates with Surface Notches


Experimental and analytical investigations of the fracture of a [0/± 45/90]10s graphite/epoxy laminate with part-through semi-elliptic surface notches have been conducted. Experimental values of notched strength were determined for a variety of notch aspect ratios and notch depths. Analytical predictions of laminate failure were obtained from three different models. One model was based on fracture mechanics concepts while the other two models were based on strength-of-materials concepts with a linear and quadratic strain distribution through the laminate thickness at the notch. The kinematic strain assumptions were in part based on results of a moiré interferometry investigation of the strain field at the notch.

The three models were equally successful in predicting the fracture of laminates with deep notches. The experimental results of laminates with shallow notches indicated more notch sensitivity (that is, greater strength reduction) than did the analytical models.

Author Information

Harris, CE
Texas A&M University, College Station, TX
Morris, DH
Virginia Polytechnic Institute and State University, Blacksburg, VA
Nottorf, EW
Texas A&M University, College Station, TX
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Developed by Committee: D30
Pages: 298–321
DOI: 10.1520/STP26142S
ISBN-EB: 978-0-8031-5044-7
ISBN-13: 978-0-8031-0980-3