Typical fractures produced by slow reverse-bend testing of reinforcing bar have been studied by fractography and fracture-profile examination. The mechanism of fracture is discussed, and it is concluded that the probability of an unstable cleavage crack forming depends on the conditions prevailing below the notches which form adjacent to bar ribs (‘deformations’) on the inner surface of the bent bar. When ‘compression cracks’ form at the notches during bending of the bars, the critical region for cleavage is just beyond the tip of these ‘cracks’. Methods of preventing this type offailure in the construction industry are suggested.
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