Abstract
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
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
