Ar. Kallmeyer et Ri. Stephens, CONSTANT AND VARIABLE AMPLITUDE FATIGUE BEHAVIOR AND MODELING OF AN SRIM POLYMER MATRIX COMPOSITE, Journal of composite materials, 29(12), 1995, pp. 1621-1648
Strain-controlled fatigue behavior of smooth specimens of an SRIM poly
mer matrix composite under constant and variable amplitude loading was
investigated, including the effects of mean stresses/strains. Signifi
cant degradation of the macroscopic stiffness was observed during cycl
ic loading, and SEM I examination of the failed specimens revealed the
degradation was due to a variety of damage mechanisms, including matr
ix cracking, fiber/matrix debonding, fiber fracture, and fiber bucklin
g. Fatigue life predictions made using common strain-based models over
estimated the experimental results for both constant amplitude and var
iable amplitude loading. An improved strain-based model for making lif
e predictions using an effective strain amplitude was proposed which w
as in much closer agreement with experimental results.