摘要
用应力一次跌落软化模式来模拟应力应变软化曲线；用双折线来模拟体变ε＿Ｖ—大主应变ε＿１，小主应变ε＿３一大主应变ε１关系，推导出球形孔扩张时，应力场、应变场、位移场和最终扩张压力的显式表达式。运用所得公式，分析了不同软化程度，不同剪胀特性和初始地应力场对球形孔扩张时，应力、位移及塑性区开展规律的影响。
A stress-dropping strain-softening mode is used to simulate the stress-strain softening curve,bilinearcurves to simulate volumetric strain ε_v vs.major principal strain ε_1 and minor principal strain ε_3 vs.major principal strain ε_1 curves.Closed-form formulas of stress,strain,displacement and final expansion pressure are dervived forball-type cavlty expansion.The effect is analyzed on stress and displacemnent field,which resulted from different pa-rameters of strain-softening,shear dilatation,hydrostatic stress field.
出处
《江苏农学院学报》
CSCD
1996年第1期83-90,共8页
Jiangsu Agricultural Research
基金
国家自然科学基金项目
关键词
剪胀
软化
弹脆塑性模型
球形孔扩张
shear dilatation
strain-softening
elastic-brittle-plastic mode
expansion of ball-type cavity
