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Additional resources for 52.Reliability
For a square profile, stress relaxation occurs mainly at the maximum temperature of the cycle, which is reached rather quickly. In such an extreme case, the stress relaxation time above threshold is shorter and therefore corresponds to a higher threshold frequency. Thus a square-cycle frequency has a greater effect on fatigue than a sinusoidal frequency, which is addressed in the model by normalizing the cycle frequency to f th: Nf = Aγ −2 ( f / f th )1/3 eφ/Tm (26) where f th is determined by Eq.
The fatigue results are different because stress relaxation and associated creep in the thermal cycle occur continuously over the temperature excursion. The thermal effects on fatigue dynamics are absent when the joints are mechanically cycled. Thermal effects cannot be quantitatively interpreted without an accurate knowledge of how strain and temperature interact. The temperature ramp rate is also important because the stress profile depends on this rate and so does the duration of the stress cycle above a threshold which dictates the dislocation dynamics and fatigue damage.
However, cleanliness of the interface and a strong bond are essential. If the interface is a continuous network of polymer bonds without gaps or contamination, the chance of corrosion is remote. In such an ideal situation, the polymer absorbs water until it saturates to the level dictated by the outside vapor pressure, acccording to Henry’s law. The water remains in solution as long as there is no loss of adhesion or interfacial defect where corrosion can nucleate. Otherwise corrosion starts in those sites which become sinks to water and other corrosive species surrounding the area.