The number of deflection cycles a contact can be expected to experience without breaking depends on the initial stress level. 一个触点期望承受的挠曲而不损坏的循环数取决于初始应力水平。
Many people are breaking down these days due to working stress. 许多人因为工作压力而垮了。
Don't press the handsaw excessively or twist the saw blade. Saw it gently while the work-piece is breaking. Compressive residual stress are the main factor in the increase of torsion fatigue limit. 使用手锯时,不可用力重压或扭转锯条,工件将断时,应轻轻锯割。喷丸后扭转疲劳极限提高的主要原因是残余压应力的作用。
The ratio of the breaking stress of a structure to the estimated maximum stress in ordinary use. The Effect of Maximal Pressure and Roll-gap on Energy Consumption of Roller Press 间断压力同最大压力的比率。最大压力与辊隙对辊压机能耗的影响
The main theories of rock breaking are summarized under water jet impact, including quasi-static elastic breaking, stress wave breaking, cavity destruction, crack extending breaking and damage breaking. 对此,综述与归纳了水射流作用下岩石破碎的主要理论,包括准静态弹性破碎理论、应力波破碎理论、气蚀(空化)破坏理论、裂纹扩展破碎和损伤破碎理论等。
Rock Breaking Effect of Blasting Stress Wave at Moderate or Far Distance 爆破应力波中远区破岩作用分析
Gravity anticlines seldom have been found there. The horizontal earth movements controlled by the Neotectonic stress field are acting upon glide direction and breaking strength of landside, which behave as superimposing gravity stress field and tectonic stress field. 新构造应力场控制水平运动对滑坡的滑动方向、滑坡的破坏强度主要体现为构造应力场与自重应力场的叠加机制。
It was found that the breaking stress decreased with decrease of molecular weight and degree of macromolecular orientation. 研究结果表明,本文工艺条件下研制的PDS缝线在体外降解过程中随着分子量和大分子取向程度下降,力学性能明显下降,4星期时强度基本消失。
It was found that the breaking stress decreased with decrease of molecular weight and degree of macromolecular orientation. The exPeriment show that the macromolecular orientation degree 0f the new material varies with silk reeling pmeesses; 对于采用不同缫制加工工艺制得的各种真丝新材料,其材料中大分子取向程度亦不相同。
Under laboratory conditions, after calcined at the temperature of 700 ℃, red-mud is mixed with cement to produce a special kind of concrete, with which the standard concrete is compared in terms of breaking and stress intensity. 在实验室条件下,对赤泥进行700℃的煅烧处理,并利用其制取水泥赤泥混凝土,与基准混凝土的抗折、抗压强度进行对比。
Slab breaking induced by thermal stress; 温度应力引起的断板;
Mechanical vibration produces finer dendrite by increasing the undercooling degree, breaking dendrite into pieces by shear stress and melting the secondary dendrite arm. 机械振动法通过增大过冷度、剪切力碎化枝晶和使枝晶臂熔断来细化晶粒。
The boride layer of low brittleness shows slight indentation cracks, pillar crystal breaking and shallow stripping under drawing and pressing stress. 脆性的降低使渗硼层在压应力和切应力下的压痕断裂、柱状晶折断和浅层剥落现象明显减轻。
The article introduces in brief the principles of selection of aluminium for parts of the overhead catenary system on electric railway. and how to increase the breaking toughness and decrease the tendency of stress corrosion cracking of the parts by control alloying composition and adjust technology. 简述了用于高速电气化铁路接触网零件的铝合金的选材原则,介绍了如何通过控制合金成分、调整工艺来提高零件的断裂韧性和减少应力腐蚀开裂倾向。
Conventional yield stress, breaking stress and breaking extensibility of the blends with different proportions were also measured. 测定了共混物的屈服应力、断裂应力和断裂伸长率。
The results showed that the critical fracture load of passive films reduced and the displacement excursion decreased with increasing the concentration of hydrogen. The reduction of radial breaking stress and elastic modulus of passive films is attributed to that hydrogen changes the structure of passive films. 结果表明:随氢含量的增加,不锈钢钝化膜的临界破裂载荷降低,位移偏移量减小,氢导致钝化膜的径向抗拉强度(应力)和弹性模量降低,钝化膜随氢含量的增加而逐渐软化。
The properties of the modified polyacrylate size and its applied properties on ramie were measured, such as breaking strength, breaking extension and desizing percent of sizing yarn, tensile stress, thickness, water-solubility and abrasion resistance of size film. 实验测出聚丙烯酸酯改性浆料的一些浆料性能及其在苎麻上浆后的断裂强力,断裂伸长率,退浆率以及浆膜的拉伸应力,厚度,水溶性,耐磨性等一系列浆纱性能数据。
The phenomena mentioned presumably srises because of the synergistic effect of increasing of breaking elongation by BPA and of yielding stress by multifunctional rubber. 这可能是由椽胶提高断裂伸长与双酚A提高屈服应力产生协同效应的结果。
Mechanical model test and two dimensional photoelastic stress analysis were done to determine the breaking load and the stress distribution in preparations with centric and eccentric occlusions. 设计牙力学模型和二维光弹模型实验,对不同咬合状态下几种预备体的受力进行分析对比。
The fatigue damage and breaking of rock affected repeatedly by blasting stress wave 软岩巷道在周边爆破反复作用下的损伤疲劳破坏
By analysis for form and growing of metal pitting corrosion, film breaking arouses pitting corrosion with stress producing. 通过对金属点蚀形成及发展过程的分析表明,点蚀是由(钝化)膜破裂引起的,而伴随膜破裂过程必然会产生应力波一声发射。
At the same time, because raising breaking toughness is less that breaking toughness for fatigue crack of rock, so, fatigue damage and breaking of rock affected by cycle stress that is less than break toughness will be caused are drawn. 岩石疲劳裂纹的起裂韧度比其断裂韧度小得多,因此岩石会在远低于其断裂韧度的循环应力作用下发生疲劳损伤破坏。
The wear mechanism of high vanadium high-speed steel is combined micro-cutting and fatigue wear with carbide particle breaking and peeling off under stress. 高钒高速钢干滑动磨损机理为显微切削和疲劳磨损的复合,并且有应力作用下碳化物的碎裂及脱落。
Firstly, by the experiment with the influence of loading rate to rock breaking state under the condition of plane stress, we had observed that the change of loading rate could bring the transform of jacking rupture to shear rupture. 首先通过平面应力状态下加载速率对岩石破坏形态影响的实验,观察到加载速率的变化能够引起张拉形断裂向剪切形断裂的转化。
The results showed that tensile strength, tensile yield stress and tensile breaking stress were increased with the increase of bore distance; 结果表明,随筛板孔距的增加,其拉伸强度、拉伸屈服应力及拉伸断裂应力均提高;
The influence of thermal oxygen on the tensile yield stress, tensile breaking stress, impact strength, elongation at break, melt point and the heat of melting of PF Nylon 1212 is investigated. 通过热氧老化试验,考察了热氧对尼龙1212拉伸屈服应力、拉伸断裂应力、冲击强度、断裂伸长率、熔点、熔融热的影响。
Dynamic fixation eliminated the shear force between intramedullary nail and locked nail, prevented the nail from breaking and diminished the stress block between the fragments. 动力性固定消除了髓钉与锁钉间的剪力,有效防止了断钉,并消除了骨折端的应力遮挡;
Breaking-resistant force, breaking moment, section modulus and bending stress were significant negatively correlated with lodging index. 抗折力、折断弯矩、断面模数和弯曲应力都与倒伏指数呈极显著负相关。
Based on the studies above, the prediction models of breaking stress and breaking elongation are explored primarily. 基于上述对浆纱耐磨性和浆纱结构的研究,对浆纱断裂强力和断裂伸长率预测模型进行了初步的探索和研究。
The process of flushing is breaking coal, releasing massive of methane and changing stress condition of coal body. 水力冲孔的过程是高压射流破碎煤体、释放大量瓦斯、改变煤体应力状态的过程。