Study on regularity of different lay types wire rope scrap broken wire in GB/T 5972-2016
For ordinary lay wire rope and lang lay wire rope under the same category number,in the range of 6d length or 30d length,GB/T 5972-2016 shows that there is fixed proportional relationship of about 2∶1 in the minimum number of visible broken wires of wire rope to scrap degree under certain service conditions.Analysis shows when broken wire rope length is integral multiple of wire rope lay distance,frequency ratio of double spiral steel wire in single strand of ordinary lay wire rope and lang lay wire rope also has fixed ratio of about 2∶1.Although standard gives different minimum number of broken wires for same category number of ordinary lay wire rope,lang lay wire rope,but this does not mean that lay type will affect safety of wire rope.The contribution of lay type to visible frequency of double spiral steel wire in single strand is±1,-1 for lang lay and+1 for ordinary lay.N and N±1 have clear meanings respectively.
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