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Bauschinger effect in high‐strength tensile bolts
Author(s) -
Ring Markus,
Dahl Winfried
Publication year - 1993
Publication title -
steel research
Language(s) - English
Resource type - Journals
eISSN - 1869-344X
pISSN - 0177-4832
DOI - 10.1002/srin.199301565
Subject(s) - bauschinger effect , ultimate tensile strength , compression (physics) , materials science , tension (geology) , composite material , yield (engineering) , tensile testing , structural engineering , engineering , plasticity
High‐strength tensile bolts of class 8.8 were produced without final heat treatment. Shank‐threaded bolts with shanks larger than 65 mm showed inadmissibly large elongations after being tested in proof‐load tensile tests according to DIN‐ISO 898‐1. The reason could be plastic compression applied during fabrication in combination with tensile stresses during testing (Bauschinger effect). For a better understanding of this phenomenon different types of steel were tested in combined compression‐tension tests. It was discovered that plastic compression of 1–1.5 % can lead to a maximum decrease in yield strength of 50%. The mathematical relation between decrease and compression rate can be described by a simple power law. As a consequence bolts of this size need an additional heat treatment. In case of being integrated in some other part of production no additional costs occur. Wholly threaded bolts and shank‐threaded bolts with shanks smaller than 65 mm can be used without final heat treatment.