A study was made of the carrying capacity and fracture of glass fiber composite notched columns having pinned-ends and loaded in compression. Apparently the cracks had a detrimental effect by lowering the maximum carrying capacity of the columns. However, these cracks, which were initially machined in the transverse direction at the center of the column, changed their direction of propagation with increasing load and continued their propagation in the longitudinal direction parallel to the glass fibers. A compari son of these tests results with those obtained previously on aluminum columns [1-3] is also given.
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References
1.
H. Liebowitz , H. Vanderveldt, and D.W. Harris, "Carrying Capacity of Notched Columns,"Int. J. Solids Structures , Vol. 3 (1967), p. 489.
2.
H. Liebowitz , D.W. Harris, and H. Vanderveldt, "Fracture of Long and Short Notched Columns,"Experimental Mechanics , Vol. 8, No. 2, (1968), p. 49.
3.
H. Vanderveldt and H. Liebowitz, "Fracture and Response of Notched and Un-notched Columns," Submitted for Publication (Dec. 1967).
4.
Private communication between Monsanto Co. and Dr. H. Liebowitz (1967). This value of the modulus was supplied by the Monsanto Co. It is found from flexural tests using a 16/1 span to depth ratio and 3 point loading; the value obtained for this modulus is an average value resulting from five or more tests.
