After pretorsion the successor tensile yield limit and strength limit both improved very highly , but the trend of the increase of the strength limit was suspended till the pretorsional capacity reached 17 , when the pretorsional capacity was greater than17 ( prestrain value was 81 . 19 % of total strain ) , the successor strength limit rapid failed and approached the yield limit . this illustrate the a3 steel specimen translate from plasticity into friability after pretorsion strengthen . when the specimen was operated by tension - torsion action , the yield limit had very large improved , but the strength limit changed very little . furthermore , the trend of the increase of the strength limit was suspended till the pretension capacity reached 0 . 25 ( prestrain value was 66 . 93 % of total strain )
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