The Plastic Zone and Residual Stress near a Notch and a Fatigue Crack in HSLA Steel.
NORTHWESTERN UNIV EVANSTON IL DEPT OF MATERIALS SCIENCE
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The plastic zone and residual stress around a notch under load and with the load removed, and around a fatigue crack at the same stress intensity factor as for the notch have been examined, with automated X-ray techniques and a microbeam. There is a good agreement between the measured plastic zone size and Hutchinsons theory for a work hardening material. Residual stresses exist well behind the tip, and vary with depth, so that measurements of crack closure on a surface may not be directly related to closure stress which samples the bulk. Instabilities in the dislocation arrangement can be detected by comparing X-ray line broadening of bulk specimens under load, and with the load removed. Author
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