Strain and load controlled fatigue tests were run on boron-aluminum and boron-epoxy angle-plied specimens. Acoustic emission data was recorded using a gating technique that eliminated most extraneous noise. Various material parameters were monitored during the test. A good corre lation between acoustic emission and damage extent and propagation was obtained. This was evidenced by an apparent first order linear relationship between dynamic compliance and totalized acoustic emission. A basis for an energy based failure model is formulated and discussed.
Get full access to this article
View all access options for this article.
References
1.
P.C. Paris, "The Fracture Mechanics Approach to Fagigue,"Proc. of the 10th Sagamore Army Mont. Res. Conf., Syracuse Univ. Press, Syracuse, NY, (1964 ).
2.
K.L. Reifsnider, W.W. Stinchcomb, R.S. Williams, and L.A. Marcus, "Heat Generation in Composite Materials During Fatigue Loading," technical report # AFOSR-TR-73-1961, May, 1973.
3.
R.S. Williams, K.L. Reifsnider, W.W. Stinchcomb, and H.T. Turgay, technical report to be published, (1974).
4.
G.L. Jones, "Acoustic Emission Studies in Composites and Composite Reinforced Metals,"Materials Engr. Sci. PhD dissertation, VPI&SU, (1974).
5.
R.S. Williams, K.L. Reifsnider, "Experimental analysis of heat generation and thermal emission due to cyclic stress and related damage in fiber reinforced materials: presented at VAS annual meetingWilliamsburg, VA, May, 1973.
6.
K.L. Reifsnider, and R.S. Williams, "Determination of Fatigue Related Heat Emission in Composite Materials,"presented and accepted for publication at Fall SESA meeting, Oct ., 1973.
7.
R.G. Liptai, and C.A. Tatro, "Acoustic Emission Techniques in Non-destructive Testing,"Proc. of 7th Inst. Conf. on NDT, Warsaw, Poland, June, 1973.
8.
D.O. Harris, A.S. Tetelman, F.A.I. Darwish, "Detection of Fiber Cracking by Acoustic Emission," Dunegan Corp. technical report #DRC 71-1, (1971).
9.
D.T. Raske, and J.K. Marrow, "Mechanics of Materials in Low Cycle Fatigue Testing," ASTM STP 465 , (1969).
10.
W.W. Stinchcomb , K.L. Reifsnider, L.A. Marcus, and R.S. Williams, "Effects of Cyclic Frequency on the Mechanical Properties of Composite Materials," AFOSR technical report #AFOSR-TR-73-1907 , July, 1973.
11.
K.L. Reifsnider , and E.G. Henneke, "Stochastic Aspects of Frequency Effects on the Fatigue and Fracture of Bias-ply Composite Flawed Plated Specimens,"presented at Symp. on Stochastic Problems in Mechanics , U. of Waterloo, Waterloo, Ontario , June, 1974.
12.
G.R. Irwin, "Fracture," Handbook der Physik, V. VI, (1958).
13.
J.L. Rose, "Damage Analysis in Composite Materials,"presented at the ASTM Composite Reliability Conference, Las Vegas, NV, April 15-16, 1974.
14.
H.T. Corten, "Fracture Mechanics of Composites,"Fracture, Vol. VII (1972) p. 675.
