The interlaminar shear strength was estimated for four types of B-A1 unidirectional composites. The shear strengths from the short beam shear test and symmetric block shear test sometimes show a considerable differ ence. It is shown that in the case of a matrix of high plasticity and (or) many defects in the shear-plane the short beam shear test gives a much too high shear strength. The symmetric block shear test supplies more realistic values both for the inter- and intralaminar shear strength.
References
1.
G. Menges and R. Kleinholz, "Vergleich Verschiedener Verfahren zum Bestimmen der Interlaminaren Scherfestigkeit," Kunststoffe, Vol. 59 (1969), p. 959.
2.
R.F. Zabora and J.E. Bell, "A Test Technique to Study Interlaminar Shear Phenomena of Laminated Composites," Technical Report AFFDL-TR-71-67 (1971), (AD-729 872).
3.
Apparent Horizontal Shear Strength of Reinforced Plastics by Short Beam Method, ASTM D 2344-76.
4.
G.L. Hanna and S. Steingiser, "Defining the Adhesion Characteristics in Advanced Composites," ASTM STP460 (1969), p. 182.
5.
C.A. Berg, J. Tirosh and M. Israeli, "Analysis of Short-Beam Bending of Fiber Reinforced Composites," ASTM STP497 (1972), p. 206.
6.
C.A. Berg, R. Melton, I. Kalnin and T. Dunn, "Fracture in the Grip Section of Fiber Reinforced, Reduced Cross Section Tension Specimens," J. of Mat. JMLSA, Vol. 6 (1971), p. 683.
7.
Berechnung und Versagensvorhersage von Faserverbundstrukturen. ZTL-Zukunfts-Technik-Luft, Fag 2, Jahresabschluβ-bericht 1975.
