tensile crack

Characteristics analysis of acoustic emission signals from steel specimens under tensile fracture and fatigue crack condition

钢制试件拉伸断裂及疲劳开裂声发射特征分析

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The addition of polypropylene fiber decreases the shrinkage ratio of mortar and increases its tensile strength, crack energy, and the max strain, i.e. its toughness rises and brittleness falls.

聚丙烯纤维使水泥砂浆收缩率降低，抗折强度／抗压强度提高，最大变形量与断裂能增大，即使砂浆韧性提高、脆性降低。

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But after dam body opened, weakened the spot structure integrity. The orifice surroundings will produce easily disadvantageous concentrated stress or bigger tensile stress, and crack at corner and edge of orifice.

但坝身开孔后削弱了该部位结构的整体性，孔口周围易产生不利的应力集中或较高的拉应力，在孔口角缘处，易产生裂缝。

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To obtain the resistance curve of crack growth of an elastic-plastic material, a test for dynamic crack initiation and arrestment is carried out on a self-designed bar-bar tensile impact apparatus by using larger diameter short specimens with deep circumferential notches and larger ligament diameters.

为得到弹塑性材料裂纹扩展的阻力曲线，采用较大外径和较大韧带直径的周边切口在自行研制的间接杆杆型冲击拉伸试验装置上进行了动态断裂和起裂止裂试验。

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The accurate calculation of stress field based on EHL theory and theory of elasticity showed that the shear stresses at surface in direction of 30 ° with rolling direction cause the pitting cracks and the tensile stresses accelerate the crack growth.

结果表明：预加拉应力使裂纹起源于表面的点蚀寿命缩短，与滚动方向成30°角的剪应力是引起点蚀的决定应力。

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After the crack initiating, it propagates along the vertical direction of the tensile stress axial line.

裂纹萌生后主要沿着与拉应力轴垂直的方向扩展.

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The measured stress and numerical simulation indicated that the whole tensile crack and the arc tensile crack were correspondent to the distribution of maximum tensile stress, the magnitude of which increased due to transition effect.

应力测试与数值模拟证明弧形拉裂和整体贯穿拉裂同最大拉应力分布相对应，并且受迁移影响边坡坡顶最大拉应力值增大。

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The modified tensile stress crack propagation criterion and influence of cranny hydraulic pressure on crack propagation

修正的拉应力裂纹扩展准则及裂隙水压对裂纹扩展的影响

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The shear crack would expand along the shear direction and the tensile crack would expand some distance along the radial direction and then expand along the shear direction in this experimental strain-rate.

在实验加载应变率范围内，剪切裂纹在外壁面萌生后会一直沿剪切方向向内壁面扩展，拉伸裂纹在沿径向扩展一段距离后，转而沿剪切方向扩展。

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The result shows that the tensile fracture crack forming of acid washing and mechanical polishing is microporous polymer and the tensile properties of acid washing is better than that of the mechanical polishing.

拉伸试验及扫描电镜断口观察等研究结果表明：酸洗、机械抛光拉伸试样表现为韧性断裂，其断裂机制为微孔聚合断裂，酸洗表现出更好的综合性能；

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Can increase genuine leather's transverse tear strength, grain surface crack intensity and tensile stretch after using.

使用后可有效增加真皮的抗撕裂强度 、 粒面崩裂强度,还可增加真皮的伸长率.

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The polypropylene fiber concrete has excellent tensile performance, crack resist-ance, ductility and load-carrying capacity and especially the polypropylene fibers can contribute to good control of early cracking in the surface of concrete.

聚丙烯纤维混凝土具有优良的抗拉性能、抗裂度、韧性和承载力，特别是对水泥混凝土表面的早期开裂控制起到了良好的作用。

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The tensile fracture crack behaviour of pearlitic ductile cast iron containing various amounts of broken ferrite was observed using SEM.

用扫描电镜对合有破碎状铁素体的珠光体球铁进行拉伸断裂过程的动态观察，研究裂纹萌生、扩展与石墨球、铁素体、珠光体组织的关系。

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Established the calculation model of waterproof layer tensile above bridge crack, compute a minimum extension and strength the waterproofing layer must have hi a certain width crack.

建立了桥面裂缝之上防水层张力的计算模型，有效地计算出桥面混凝土一定宽度裂缝上防水层须具备的最小延伸率和拉伸强度。

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The fracture mechanisms of 2090+ Ce aluminum-lithium alloys aged for different time are studied by means of semi-quantity method, and the process of the tensile fracture crack forming is discussed especially.

以2090+Ce合金为研究对象，对不同时效时间的室温拉伸断口进行了半定量分析，探讨了拉伸性能对断裂特征的响应关系，重点分析合金分层裂纹的形成过程。

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Based on the analysis of simulated results, it revealed that tensile stress at the crack tip is the driving force for the crack propagation, and the heterogeneity of mechanical property of material among concrete influences greatly on the curvilinear of crack propagation path.

通过对数值模拟结果的分析，揭示出混凝土在拉伸条件下裂纹尖端的拉应力集中是裂纹扩展的动力，混凝土组成材料力学性质的非均匀性是造成裂纹扩展路径曲折的重要原因。

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Geology feature of plastic flow and tensile crack type landslide and its formation mechanism

塑流－拉裂型滑坡地质特征及形成机理

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The criterion of the element with the maximum tensile stress will crack is presented, the iteration flow diagram of nonlinear analysis is improved, and then the position, gap and width of crack can be computed based on ′ smeared ′ crack model.

本文采用最大拉应力单元开裂准则，改进了非线性分析的迭代流程，使其最大可能地模拟实际结构的开裂情况，进而可以基于分布裂缝模式计算裂缝发生位置、裂缝间距、裂缝开展深度和宽度。

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The triaxial extension test and the cyclic extension compression test are used in the research of soil failure under static tensile crack or cyclic tensile crack conditions to identify the development of tensile crack as well as shock crack in FEM analysis of embankments.

三轴拉伸试验和周期拉压试验，用于研究静力拉裂和周期加荷拉裂的破坏，在土石坝有限元分析中判别防渗体土料拉裂和震裂的发生与发展。

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A study of tensile-shear crack and strength related to jointed rock mass

节理岩体拉剪断裂与强度研究

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The test results show that its shearing strength, compressive strength and tensile strength of cleavage crack are increased clearly by adding steel fiber to PC.

经力学实验表明，在树脂混凝土内填加钢纤维可使其抗剪强度、抗压强度、劈裂抗拉强度有明显提高，并且其韧性和耐磨性均有一定提高。

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When the lamellae were perpendicular to the tensile axis, the crack initiated and propagated in ferrite.

当珠光体层片垂直于拉伸轴时，裂纹在铁素体中萌生，平行于层片扩展；

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The result showed that the tensile load near the crack tip was dominant, and the tensile load had higher effect than the shear load.

结果表明，拉伸载荷主导界面裂纹尖端附近区域，并且拉伸效果远大于剪切效果。

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Accordingly, Stress Triaxiality, Strain Energy Density Factor and Maximum Circle Tensile Stress near the crack tip and their variation due to the circle angle variation can be derived.

根据内部裂尖附近的位移分量和应力分量可以得到裂尖的应力三维度，应变能密度因子以及裂尖附近的最大周向拉应力随着圆周角的变化而变化的情况。

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It can be concluded that the crack of skin is the macroscopic breakage form of grape and the maximal tensile stress is the main factor causing the mechanical damage of grape through comparing the model calculation with the experimental results.

经模型计算与试验结果相比较，得出表皮破裂是葡萄宏观破坏的主要形式，最大拉应力是造成葡萄机械损伤的主要原因。

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By investigating the fracture trace of epigenetic deformation in dam area of a hydropower station, silted tensile crack, a destructive mode of rock mass, controlled by rock mass structure is found except normal unloading destructive mode which is parallel to river bank slope.

通过对某水电工程坝区岩体结构的表生改造形迹调查，发现坝区除了发育与岸坡平行的正常的卸荷破坏方式外，还发育了一种破坏方式&夹泥型张裂隙。

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Static tensile crack behavior of brazed joints of dissimilar metals tubes in aerospace system

航天器异种金属钎焊接头静态裂纹行为分析

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The higher the initial temperature of fresh concrete is, the higher the maximum principal thermal tensile stress and the crack risk at the surface center node are.

表面中心点的最大主拉应力和开裂风险随浇注初温的升高而增大。

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By embedding the above research achievements in existing FEM computing program system, a three-dimensional computing program system was developed, which can be used to stress-deformation and tensile crack analysis of earth-rockfill dams.

将上述研究成果嵌入已有有限元计算程序系统，发展了土石坝应力变形和裂缝分析三维计算程序系统。

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This paper adopts the contact element to consider the dislocated slippage and tensile crack, and uses the infinite element to reflect the far field effect of the groundsill infinite region more efficiently.

采用无限元更有效地反映地基无限域的远场效应；

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