Abstract
A microstructural examination of reactor graphite is described. Thin plates of graphite bonded to a thick beam have been subjected to a uniform strain field by bending the beam and simultaneously examined by a light microscope. From such an examination it has been established that the characteristic striations in grist (calcined coke) particles are main lines of weakness while binder bridges are regions of high stress concentration. Such localized cracking appeared at stresses lower than those required for complete fracture. Further evidence of the presence of localized cracking was provided by the rapid decrease in the apparent modulus of the material in bulk (determined by a resonance frequency method) if specimens were prestressed to values approaching the fracture stress.
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