A STATISTICAL INVESTIGATION OF MICROCRACK FORMATION
STANFORD UNIV CA DEPT OF MATERIALS SCIENCE AND ENGINEERING
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Low temperature tension tests were made with low carbon polycrystalline iron, in which stable cleavage microcracks form. Probability distributions of the orientation of these cracks were used to investigate the effects of stress and strain on their formation. Since only the surface traces of cracks could be observed experimentally, relationships were developed to give the distribution of the true orientation of these cracks as measured by the direction of the normal to the crack plane. Simple models for the effect of stress on crack formation were investigated, including the cottrell-Petch formulation for microcrack formation. Predictions of the probability distribution of crack orientation angles, and from these the distribution of the surface trace angles that should be observed experimentally, were determined for these models.
- Metallurgy and Metallography