Stress and strain characteristics of screw-thread steel bolts in different working conditions
To solve the problems of complicated,unpredictable bolts stress,the stress and strain characteristics and evolution rules of normal and defective screw-thread steel bolts in different working conditions are analyzed by numerical simulation based on laboratory tensile testing and DIC monitoring.The results show that,the maximum stress,maximum true strain and maximum plastic strain of anchor rods increases gradually with the increase of load values and types,generally presenting an increasing tendency.When the bolt has defects,the stress and strain on defects are obviously concentrated,the shape and location of defects will affect the stress and strain distribution.Due to the existence of screw-thread steel,transverse ribbed structures and defects,local stress and strain are concentrated on rods and the plastic strain turns larger.The sites of plastic strain concentration are prone to develop into the source of cracks under the influences of high load and corrosion,which leads to the failure of bolt breakage.The research results can provide a reference for bolt structure optimization,condition monitoring and service life prediction.
screw-thread steel boltbolt structurestress and strainplastic straintensile test
万方数据
维普
