Fatigue crack growth rate studies of two high temperature structural adhesives, EA-9649 and AF-163, are described. It is shown that crack closure loads develop as a result of fatigue crack propagation. The fatigue crack propagation rates have been correlated with the strain energy release rate range, AG and with an effective strain energy release, ΔGaff. The effective strain energy release rate range subtracts the strain energy due to crack closure from the applied strain energy release rate range.
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David Jablonski (1980) studied this question.
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