X-RAY STRESS ANALYSIS OF THE BAUSCHINGER EFFECT IN METALS.
PICATINNY ARSENAL DOVER N J AMMUNITION ENGINEERING DIRECTORATE
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As a result of tensile tests performed on fired 175mm shell bodies, it was observed that the yield point was lower after loading the shell in set-back. A sizeable difference in yield strength was measured between as-fired and unfired shells with little difference in ultimate tensile strength. One possible cause of this phenomenon is the Bauschinger Effect. The Bauschinger Effect states that a specimen which is plastically strained in one direction and along one axis has a greater yield strength for that direction, but reduced loading strength in the opposite direction. To prove the magnitude to which this material would undergo a reduction in yield, X-ray diffraction measurements were made of beams cut from specimen shell bodies. X-ray stress measurements were made while the beam was maintained under different loads. A computer program was developed to calculate residual stress. Author
- Physical Chemistry