I have an application where a braided copper cable is breaking during a sinusoidal sweep vibration test, at the termination points. Changing the temper of the wire is the easiest option to improve this condition. Redesigning the parts to move the resonant frequency is not an option right now. My initial thought was to change the temper to get a higher elongation at fracture so the part is more ductile but I think now that since this is a fatigue failure below the tensile strength that the elongation value is not really relevant. So would using a material with a higher tensile strength be better to resist crack propagation, even if the ductility is lower? Or something different altogether? I’ve only been able to find fatigue strength values for “annealed” and “half-hard” material, but not the other tempers that I can select from.
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