Experimental results on fatigue crack propagation in PEEK under different load levels, specimen thickness, and environmental temperatures reported in References [1] and [2] are analyzed. When the kinetic data is plotted against J1 = σv δ (where σv is the yield stress of the material and δ is the crack tip opening displacement), the crack speed is practically independent of the load level, specimen thickness, and environmental tempera tures up to 75°C. The experimental data is confronted with a power type kinetic equation and the kinetic equation of the crack layer model. The analysis indicates that both kinetic equations describe well the data under a wide spectrum of loading conditions.
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