a method and apparatus for accomplishing stress relief in fabricated structures by application of dynamic loading induced by vibration to relieve residual stresses sufficiently to achieve dimensional stability . maximum dynamic loading of the structure by use of an accelerometer attached to the structure is obtained by scanning a range of vibration frequencies to arrive at maximum output of the accelerometer corresponding to the maximum in the dynamically applied loading and tuning the vibration to a frequency corresponding to the peak in the acceleration curve .