1) the critical divergence ratio theory of void
临界孔洞扩张比理论
2) critical void-growth ratio
临界空穴扩张比
1.
The critical void-growth ratio,Rc/Ro,of steel BHW60,steel 20 or steel 45 was measured quantitatively under SEM,and the measured positions are at the core of fracture surface of cylindrical tensile specimens.
利用扫描电镜测量了ＢＨＷ６０钢、２０钢和４５钢拉伸试样断口心部的临界空穴扩张比Ｒｃ／Ｒｏ，并据此分析了由于环境温度和扭转预应变等因素引起的韧脆转变过程及其细观形态。
2.
By observing the appearance of fracture zone,measuring the impurity composition and distribution and the critical void-growth ratio of the joints at normal temperature under scanning electron microscope,it discusses the distribution regulation of the critical zoid-growth ratio and fracture toughness of the joints and concludes that the.
同时使用扫描电镜、能谱分析仪观察了拉伸断口形貌，测定了夹杂物的成分、分布特征以及常温下接头的临界空穴扩张比Ｒ_ｃ／Ｒ_ｏ，讨论了Ｒ_ｃ／Ｒ_ｏ的分布规律和接头的断裂韧性。
3) Critical void growth ratio
临界空穴扩张比
1.
The fracture criteria of pressure vessel steel 16MnR are measured,and the results of the test indicates that the critical void growth ratio of 16MnR is constant,and the initial stages of ductile fracture of 16MnR correspond with R-T model.
在此基础上,对压力容器常用材料16MnR钢的断裂参量进行了测试,结果表明,16MnR钢的宏、细观临界空穴扩张比(VGC)均是不敏感于应力的材料常数,且16MnR钢韧性断裂的早期行为符合R-T模型。
5) cavity expansion theory
圆孔扩张理论
1.
Considering the plugging effect of the pipe pile,the cavity expansion theory is applied to studying the squeezing effect of pipe pile.
首先综述了国内外管桩挤土效应和土塞效应的研究现状,然后在考虑土塞效应的前提条件下,利用圆孔扩张理论对管桩的挤土效应进行了分析研究。
2.
Based on the squeezing effect in the process of pile sinking,the squeezing behaviour of concrete-cored sand-gravel piles is analyzed by applying cavity expansion theory and consolidation theory.
从挤土桩沉桩过程产生的挤土效应出发,运用圆孔扩张理论和固结理论,分析了混凝土芯砂石桩的挤土性状。
3.
The cavity expansion theory used for plane problems is extended to the spatial axisymmetric condition to improve the analytical solution of soil displacement induced by pilesinking.
将平面圆孔扩张理论推广到空间轴对称条件,改进了沉桩引起的位移解析解;考虑土体的弹塑性和挤土引起的土体性质的变化,利用有限元法对沉桩进行了分析计算;对沉桩进行了离心模型试验。
6) cavity expansion method
圆孔扩张理论
1.
The radius of plastic area, the maximum compress stress caused by driving pile ,and the pore water stress can be concluded by using the cavity expansion method and the effective stress theory.
分析了软土地基中静压桩的挤土效应机理,依据圆孔扩张理论和有效应力原理,推导出塑性区影响范围、桩对土体的挤压应力、孔隙水压力估算公式等。
2.
Reviewed are five methods for the analysis of the penetration of jacked in piles,namely,cavity expansion method,strain path method finite element method,slip line method and calibration model test.
在分析饱和粘土中静压桩的贯入机理的基础上，对静压桩沉桩分析的圆孔扩张理论、应变路径法、有限元分析、滑移线理论和模型槽试验等五种方法逐一进行评述，并提出在传统的平面圆孔扩张理论基础上加以改进，采用准静态空间轴对称方程组对静压桩贯入过程进行模拟，从而得出土体位移、应力、初始超孔压的空间解析解，同时采用有限元分析、模型槽试验相互印证的研究方
补充资料：极大扩张和极小扩张
极大扩张和极小扩张
maximal and minimal extensions
极大扩张和极小扩张匡.习的司出目.公油抽lex妇心.旧;MaKcl.Ma刀‘.oe H Mll.”M田.妇oe PaC山一Pe皿朋] 一个对称算子(s笋nr贺苗c opemtor)A的极大扩张和极小扩张分别是算子牙(A的闭包，(见闭算子(cfo“月。详mtor”)和A’(A的伴随，见伴随算子(呐。int opera.tor)).A的所有闭对称扩张都出现在它们之间.极大扩张和极小扩张相等等价于A的自伴性(见自伴算子(义休.adjoint operator))，并且是自伴扩张唯一性的必要和充分条件.A.H.J’Ior朋oB，B.c.lll户、MaR撰
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参考词条