On the role of strain and stress state in ductile failure
Abstract U sing plane strain and axisymmetric notched tensile specimens in combination with finite deformation stress analysis, the strain to initiate failure in a range of structural steels is shown to be co-related by the state of stress for both axisymmetric and plane states of strain. The implications of this result for ductile failure terminated by flow localisation is discussed in the light of the theoretical work on localised flow.
In the light of the situation that there are no provisions about fatigue load in the highway bridge design codes and specifications in China for the time being,this paper conducts a study of the determination method and principle of fatigue test load for the cable and girder anchorage structure of highway steel cable-stayed bridge,using the specifications abroad and fatigue cumulative damage theories,on the basis of the vehicle load statistic data collected in some cities and on some sections of the National Roads in the country,and also with reference to the traffic volume prediction in the feasibility study of Sutong Bridge and other relevant highway engineering technical standards.