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总览 评价 张海东 1, , 朱志武 1,2,* ( 1、 西南交通大学力学与工程学院,四川 成都,610031; 2、 中科院寒旱所冻土工程国家重点实验室,甘肃 兰州,730000; ) 摘要: 采用分离式霍普金森压杆(SHPB),对于-17℃冻土进行了应变率约350、600、800、100
张海东1,, 朱志武1,2,*
(
1、西南交通大学力学与工程学院,四川 成都,610031; 2、中科院寒旱所冻土工程国家重点实验室,甘肃 兰州,730000; )
摘要:
采用分离式霍普金森压杆(SHPB),对于-17℃冻土进行了应变率约350、600、800、1000和1200s-1的单轴冲击实验。获得了其相应应变率下的应力应变关系。发现其没有明显的屈服现象,具有显著的应变率效应,其峰值应力与最终应变均随加载应变率增大而增大,并且具有一定的线性关系。引入含损伤的Johnson-Cook模型,描述-17℃冻土的应力应变关系,发现在600~1200s-1的加载应变率范围内,该模型具有较好的适用性。
关键词:
固体力学;冻土;冲击;分离式霍普金森压杆;应变率效应;损伤
ZHANG Haidong, ZHU Zhiwu*
(
School of Mechanics and Eng.,Southwest Jiaotong Univ.,Chengdu 610031; )
Abstract:
A split Hopkinson pressure bar (SHPB) is employed to investigate the dynamic behavior of -17℃ frozen soil under uni-axial dynamic compression test with strain rates from 350s-1 to 1200s-1.The stress-strain relations at various strain rates were obtained. The frozen soil didn't yield during the tests.The compressive strength of frozen soil shows positive strain-rate sensitivity over the range of strain rates employed.The Johnson-Cook model with damage was introduced to describe the dynamic behavior of -17℃ frozen soil.This model works well at the strain rate range from 600 s-1 to 1200s-1.
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