Temperature dependent fatigue crack growth in electrical steel laminates with ?m-thick epoxy layers

The effect of adhesive layer thickness on monotonic roll peel strength and fatigue crack-growth kinetics was investigated for electrical steel laminates with bond line values ranging from 7 to 48 ?m. Roll increasing epoxy up 20 In contrast, leveling at higher values. fracture mechanics approach in mode I delivered an equivalent ranking such as testing. However, energy-based analysis much more sensitive than testing, also thicker lines. different failure modes were correlated the plastic deformation zone size developing propagating crack. case a constrained zone, cohesive mainly within ascertained. interfacial interestingly better crack growth resistance deduced weakly or non-constrained zone. Regarding temperature dependency, enhanced obtained 60 °C. At this about 50 °C below maximum loss factor adhesive, smaller 23 testing temperatures slightly above glass transition temperature, propagation rate 10 100 higher.