摘要
冰体材料对应变速率很敏感,存在一个韧脆转变区和转变速率 εR,当 ε< εR时冰体为韧性性质,当 ε> εR时,冰体为脆性性质.因此可按冰体的不同性态分段描写本构模型,对冰体的韧性性质给出了损伤模型,对冰体的脆性性质给出了断裂模型.分别用损伤模型预测韧-脆转变区的起始速率,用断裂模型预测韧-脆转变的终点速率及相应的破坏应力.
Ice strength is very sensitive to strain rate, and there are a range from ductile deformation to brittle deformation and a velocity of transit . Ice is ductile as and is brittle as . So the constitutive model of ice can be described in different range with the relevant property. Ice ductile property can be described by damage model and ice brittle property by fracture model. The start velocity from ductile property to brittle property of ice can be predicted with damage model, and the end velocity can be predicted with fracture model. By the same way the relevant fracture stress can be worked out.
出处
《冰川冻土》
CSCD
北大核心
2003年第S2期304-307,共4页
Journal of Glaciology and Geocryology
关键词
冰体材料
损伤模型
断裂模型
韧-脆转变速率
ice material
damage model
fracture model
transit velocity from ductile property to brittle property
