The well-known tradeoff between strength and ductility is a key issue in the large-scale engineering application of steel materials to resist fatigue due to earthquakes and other vibrational excitations.The steel prod...The well-known tradeoff between strength and ductility is a key issue in the large-scale engineering application of steel materials to resist fatigue due to earthquakes and other vibrational excitations.The steel production industry provides a vast range of technologies to achieve the desired performances.Through experimental research,it was found that FeCrNi-based high-ductility steel(HD-S)can demonstrate remarkable hysteresis behavior due to extensive deformation capacity of strain-hardening until the ultimate fracture,compared to industrially manufactured high-strength steel(HS-S)with the level of 1 GPa in yield strength.The balance between strength and ductility can be realized by slightly adding the percentage of Ni by 5%to achieve a ductile hysteresis behavior.Moreover,the HD-S specimens exhibit greater resistance to low-cycle fatigue with large plastic amplitude.By developing a new damage evolution law based on instantaneous damage differential during nonstationary fatigue history,the fatigue life of materials is extended into the inelastic hinges of flexural beams/origami components.The proposed approach enables the fatigue design of steel structural components with desirable disaster-prevention capacities for complex steel structures.展开更多
基金supported by the National Key R&D Program of China under Grant No.2022YFB2602700the National Natural Science Fund for Excellent Young Scientists Fund Program,the Fundamental Research Funds for the Central Universities(Grant No.2022CDJKYJH052)the Support Plan for Returned Overseas Scholars of Chongqing(cx2020022).
文摘The well-known tradeoff between strength and ductility is a key issue in the large-scale engineering application of steel materials to resist fatigue due to earthquakes and other vibrational excitations.The steel production industry provides a vast range of technologies to achieve the desired performances.Through experimental research,it was found that FeCrNi-based high-ductility steel(HD-S)can demonstrate remarkable hysteresis behavior due to extensive deformation capacity of strain-hardening until the ultimate fracture,compared to industrially manufactured high-strength steel(HS-S)with the level of 1 GPa in yield strength.The balance between strength and ductility can be realized by slightly adding the percentage of Ni by 5%to achieve a ductile hysteresis behavior.Moreover,the HD-S specimens exhibit greater resistance to low-cycle fatigue with large plastic amplitude.By developing a new damage evolution law based on instantaneous damage differential during nonstationary fatigue history,the fatigue life of materials is extended into the inelastic hinges of flexural beams/origami components.The proposed approach enables the fatigue design of steel structural components with desirable disaster-prevention capacities for complex steel structures.
