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I would suspect you were operating you modifications too near their natural frequency. Even if you merely pass through, components with a low fatigue life, such as aluminum, will break eventually unless you use a high safety factor in your design. For a simple beam the calculations are trivial but on something like a nose cone you are best left to testing it. In some applications you can pass through multiple resonating frequencies - we often encounter this in turbomachine design. If yu want to investigate attach some accelerometers to oscilloscopes and read them as you drive. If you notice peaks in the cycles, you have a problem.
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