摘要
南京砂岩、合肥砂岩在频率为0.5～25 Hz的循环加载实验中取得了滞回曲线,其非稳定部分主要由加工硬化阶段产生的微损伤引起,且滞回曲线随频率的增高朝稳定滞回圈发展,随循环数增加,滞回圈由稀变密,滞回圈面积减小。从3方面阐明了循环加载的应变硬化和软化响应:在恒应力控制下轴向应变幅值减小,应变振幅随应力振幅的增大逐渐增大,随应变振幅的增大其模量减小。
Through the cyclic loading (0.5-25 Hz) experiment on Nanjing and Hefei sandstone, it is found that the unstable behavior of hysteresis is mainly caused by micro-damages growing in processing-hardening period. It is observed that hysteresis loops become small and stable as frequency or cyclic number increasing. The effects of strain hardening and softening are suggested on the basis of strain-amplitude decreasing under constant stress, strain-amplitude increasing with stress-amplitude increasing, and modulus decreasing with strain-amplitude increasing.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2003年第11期1807-1810,共4页
Chinese Journal of Rock Mechanics and Engineering
基金
地震科学联合基金
教育部高等院校博士学科点专项科研基金(10003)联合资助项目。
