压应力

Based on the foregoing analysis, the critical condition of realizing ductile/brittle transform is confirmed, and then, the model of ductile grinding of engineering ceramic is built.

以陶瓷材料压痕断裂力学、线性断裂力学和微观断裂物理学为理论基础，系统的分析和讨论了磨削加工过程中微裂纹的产生机理及其影响因素，建立了裂纹分布模型，并根据位错产生微裂纹机制，对磨削过程微裂纹的形成采用位错塞积模型来描述，从能量平衡的角度，讨论位错裂纹的稳定性与磨削应力的关系，确定了材料脆性去除和塑性去除转换的临界条件，最终建立以此为基础的工程陶瓷材料延性域去除模型。

Central cracked circular disk; split Hopkinson pressure bar; dynamic fracture ; dynamic stress intensity factor

中心裂纹圆盘；分离式霍普金森压杆；动态断裂；动态应力强度因子

By the analysis of stress distortion of circular load symmetry flat plate, starting from the entire deriving course of thickness calculation formula, derives the simple formula of calculating blind flange thickness, which is fit for oral calculation of hydrostatic pressure testing of in-situ equipment and pipeline.

通过对对称载荷圆形平板的应力变形进行分析，从其厚度计算公式的整个推导过程入手，归纳整理出适合于施工现场设备及管道等试压时，所需的盲板厚度的简易计算公式，使其达到现场口算化。

He unstable temperature field of roller compacted concrete dam is one of the basic conditions for simulation stress calculation.

碾压混凝土坝的非稳定温度场是进行仿真应力计算的基础条件。

The problem of temperature stress and temperature control in the mass concrete will be in the roller compacted concrete dam.

而大体积混凝土所具有的温度应力与温度控制问题在碾压混凝土坝中同样存在。

In order to study impact mechanical properties of the basalt fiber reinforced concrete, the BFRC specimens with 0、0.1% and 0.3% fibre volume content were prepared. The Φ100mm split hopkinson pressure bar apparatus was adopted tocarry out the impact compressive experiment. The dynamic stress-strain curves were obtained. The impact mechanics performance of BFRC were studied through analyzing the impact compressure strength and deformation.

摘 要：为了研究玄武岩纤维混凝土（basalt fiber reinforced concrete，简称BFRC）的冲击力学性能，制备了纤维体积掺量分别为0、0.1%和0.3%的BFRC试件，采用Φ100mm分离式霍普金森压杆（split hopkinson pressure bar，简称SHPB ）设备对BFRC试件进行了冲击压缩试验，得到了BFRC的动态应力应变曲线，从冲击压缩强度和变形两方面研究了不同应变率下BFRC的冲击力学性能。

The elastic stress self-monitoring of the key sections of carbon fiber reinforced smart concrete beams can be achieved based on FCERECS correlation curve obtained from experiment.

基於实验所得CFRC电阻变化率与弹性压应变的相关曲线，可实现碳纤维机敏混凝土梁控制截面的弹性应力自监测。

New ideas and methods in the paper:1 The formulas on perforated casing collapse strength were deducted, which offereda convenient method to analyze the relationship between casing collapse strength and perforation;2 The stress and displacement formulas on the system of casing, cement anddeformation under the non-uniform load were deducted, which offered the theoretical found for designing optimally casing string;3 The relationship between structure in-situ field of whole oil field and casing failurewere studied, which offered the scheme for the prediction of casing failure. The process of study in the paper:1 For simulating the relationship between the structure in-situ field and the casingfailure in the oil-deformation, the tests of the uniaxial tensile, compress, tnaxial compress and dilatability were made on the samples of the drill cores from deformation of casing failure position in Yuejing II oil field.

本文的主要创新： 1推导出了射孔套管抗挤强度的解析式，为分析射孔与套管强度的变化关系提供了简便的方法； 2推导出了非均匀地层载荷作用下套管、水泥环和地层组合体的应力和位移解析式，并非均匀作用下套管柱优化设计提供了理论依据； 3研究整个油田区块构造应力场与套管损坏关系，为预测套管损坏提供了可行方案；本文的研究过程如下： 1为模拟构造应力场与油层段套管损坏关系，做了大量的岩石单轴抗拉、单轴抗压、三轴试验以及岩石遇水膨胀试验，获得了研究区块岩石的弹性模量、泊松比、内聚力、内摩擦角以及岩石的线膨胀系数，这此数据为本文研究油层段套管损坏机理研究的理论分析和有限元法提供了实验数据。

The results show that this decoupling method can predict the evolvements of pore water pressure and settlement, and reflect the effect of stress path and dilatancy.

证明了该解耦方法的能较好预测孔压以及沉降的变化，并在分析过程中能较好反映应力路径及剪胀性等特性的影响。

To study the different permeability characteristics of rock, transient permeability tests of limestone and diorite were carried out. The permeability evolution and the relation between pore pressure and time of rock specimens during the complete stress-strain course were investigated. The strain-permeability equations of rock specimens during the deformation and failure course were set up. Finally, the penetration mechanism of two types of rocks was analyzed.

为研究岩石不同渗透特性，对石灰岩和闪长岩进行了瞬态渗透实验，研究了岩样全应力－应变过程中的渗透率演化规律以及孔隙压差与时间的关系，并建立了岩样变形破坏过程的应变－渗透率方程，最后分析了这两种不同类型岩石渗透机理。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。