疲劳强度

On the basis of this model and a cycles-based model of fatigue strength degradation for composite laminates, a probability distribution model of fatigue strength degradation, which is based on the ratio of initial stiffness to residual stiffness, for composite laminates was derived and a methodology was given for determination of the parameters in the model.

本文从唯象学的观点提出了一个复合材料疲劳剩余刚度衰退模型，根据该模型导出了基于疲劳剩余刚度比的复合材料层合板疲劳剩余强度概率分布模型，给出了确定该模型中各参数的计算方法。

In order to study the fatigue of pressure vessel commonly encountered problem in engineering with large destructibility , based on the theory of fracture mechanics , the pressure vessel existing original crack was equivalent to the problem of infinite flat with center crack .

为了分析工程中常见的破坏性极大的压力容器疲劳问题，基于断裂力学理论将存在初始裂纹的压力容器等效为无穷远处作用均匀拉应力的含中心裂纹无限大板问题，解出表面半椭圆裂纹和穿透裂纹的应力强度因子；利用断裂判据得到裂纹的临界断裂尺寸；采用Paris表达式对裂纹扩展速率进行描述，推导出初始裂纹在不同裂纹尺寸和形式下的裂纹疲劳扩展寿命。

Tempered at 420℃, high hardness and toughness property can be maintained. It meets the requirement of multi-times impact strength with small energy and fatigue on operating duty. It has the higher endurance life property and so on..

经420℃回火，保持较高的强度和韧性，满足汽车板簧小能量多冲和疲劳载荷的服役状态，具有较高的疲劳寿命等使用性能。

Quality equipment categories: Programmable constant temperature and humidity box, high and low temperature test chamber, salt spray test machine, oven, heat aging test machine, cold / anti-yellowing chamber, hot and cold impact test machine, hot wire testing machine, Vertical + level of combustion testing machine, testing machine tracking, key life testing machine, plug and socket load life testing machine, spring testing machine, 90-degree peel strength test machine, the breakdown strength test machine, Central compressive strength testing machine, paper tube / carton compression testing machine, wearable rub tester, plug test machines, rotor life durability testing machine, testing machine Life expectancy clamshell mobile phone, mouse, roller-life testing machine, vibration test machine to simulate the vibration motor transport units, cell phone drop test machine, packaging drop test machine, torsion testing machine wire Qu, sudden pull plug wire tester, static tensile testing machine, wire bending rock testing machine, wire elongation testing machine, universal testing machine, tensile testing machine, drop-ball impact testing machine, fatigue life testing machine headphones, headsets Life expectancy tensile testing machine, push pull, the cloth, carvedilol, Victoria, Xiao, Lane, Shaw Sclerometer, video measuring instrument, precision mapping microscope, digital projectors, stereomicroscope , metallographic microscope, reading microscope, continuous zoom microscope, magnifying glass, caliper, micrometer, standard weight, height, the thickness, the slab of rock, electronic weight, said that electronic counting, electronic scales, analytical balance, standard light boxes, etc..

可程式恒温恒湿箱、高低温试验箱、盐水喷雾试验机、干燥箱、热老化试验机、耐寒/耐黄变试验箱、冷热冲击试验机、灼热丝试验机、垂直+水平燃烧试验机、漏电起痕试验机、按键寿命试验机、插头插座负载寿命试验机、弹簧试验机、90度剥离强度试验机、破裂强度试验机、环压强度试验机、纸管/纸箱抗压试验机、耐磨擦试验机、插拔力试验机、转轴寿命耐久试验机、手机翻盖寿命试验机、鼠标滚轴寿命试验机、振动试验机、模拟汽车运输振动台、手机跌落试验机、包装跌落试验机、电线曲挠试验机、插头线突拉试验机、静态拉力试验机、线材弯折摇摆试验机、线材伸长率试验机、万能材料试验机、拉力试验机、落球冲击试验机、耳机疲劳寿命试验机、耳机拉伸寿命试验机、推拉力计、布、洛、维、肖、里、邵氏硬度计、影像测量仪、精密测绘显微镜、数字投影仪、体视显微镜、金相显微镜、读数显微镜、连续变倍显微镜、放大镜、卡尺、千分尺、标准砝码、高度计、厚度计、岩石平板、电子计重称、电子计数称、电子天平、分析天平、标准光源箱等。

The material properties (ultimate yield strength, tensile yield strength, Kapp) and major performance attributes (fatigue crack growth, fracture toughness, static strength) of alloy 2199 wide-sheet and plate products also have contributed to their increased use.

2199合金宽板和金属板的物料性质（包括最终抗屈强度和抗拉屈服强度）和主要性能（包括疲劳裂缝增长，断裂韧度和静力强度）增强了产品耐用度。

By the way of X-ray stress measurement, the characteristics of residual stress distribution of specimens, which were shot peened and polished, were studied; by the way of three-point bending fatigue tests, the influence of polishing after shot peening on fatigue properties was studied; on this basis, the reason why Shot Peening Standards provide that the depth of metal removal does not exceed 10% of the specified arc height was analysed.

文中指出300M钢喷丸强化工艺中打磨对喷丸效果的影响问题；通过X射线应力测定，研究喷丸及打磨后试样的残余应力分布及变化的特点；通过三点弯曲疲劳试验，研究喷丸后打磨对试样疲劳性能的影响；在此基础上，分析喷丸标准中规定喷丸后打磨去除量不可以超过阿尔门强度值的1/10的原因。

The object of the present paper was to study the relationship between corrosion fatigue crack growth rate da/dN and stress intensity factor amplitude ΔK of 07MnNiCrMoVDR steel by corrosion fatigue crack growth rate experiment in H2S solution. This steel is the typical material used in chemistry and oil chemistry equipment in our country. Corrosion fatigue safety assessment method of pressure vessels with defects in service could be explored and investigated.

本文研究通过对我国化工和石油化工装置中的典型材料07MnNiCrMoVDR钢在腐蚀介质H2S水溶液中疲劳裂纹扩展速率的研究，寻找其腐蚀疲劳裂纹扩展速率da/dN和应力强度因子幅值ΔK之间的关系，探索研究在役含缺陷压力容器腐蚀疲劳安全评定技术。

The effect of subzero treatment temperature on the fatigue property of the ultra-high strength steel B318 was studied.

研究了冷处理温度对超高强度钢 B318疲劳性能的影响，结果表明，在相同条件下，冷处理温度对该钢的疲劳性能影响很大。

The stresses in the shell of tank and in the structures of opening s at the top and bottom crown of tank under the several conditions including pressure-testing, operating, seismic and pressure circle fatigue were analyzed by means of the finite element analysis.

介绍了1000m3 氧气球罐的应力分析设计，分别对球罐整体及其上下极开孔结构压力试验工况、操作工况、地震工况和压力波动疲劳工况的应力进行了有限元分析，对其应力进行强度和疲劳寿命评定校核。

The main products include: 1, tensile strength, universal testing machine: microcomputer-controlled universal testing machine, economic-type universal testing machine, tensile testing machine micro-computer, electric / manual (Vertical / Horizontal / double pole / single pole) Rally Units, micro-computer plug test machine, spring tension and compression testing machine, etc.; Second, environmental testing machine series: constant temperature and humidity chamber, drying oven, large load-aging room, walk-in constant temperature and humidity test chamber , Thermal Shock Test Chamber, UV weathering tester, salt spray testing machine, aging chamber three, cartons, packaging, furniture testing machine series: microcomputer carton compression testing machine, the breakdown strength test machine, drop (single arm / arms) Test Units, Units microcomputer vibration test, vibration test Analog Motor Transport Units four, electrical equipment testing machine series: plug wire bending test machine, drum testing machine plugs, plug wire hoist swing test machine, plug-line static tensile testing machine, sudden pull test machine, power cord bending test machine, combustion testing machine, 90-degree peel strength testing machine, torsion testing machine wire, wire abrasion test machine, flexible wires and flexibility testing machine, wire print Kennedy fastness testing machine, measuring the rate of wire testing machine, fatigue test handset line stretching machine, plug test machine, torsion testing machine cold, temperature testing machine, wire thermostat ball pressure testing machine, hot wire tester, leakage from marks tester, wire short-circuit / open circuit / high pressure / low pressure / insulation / conduction / mispairing tester; Friday, computer, mobile phone tester series: Life expectancy axis testing machine, testing machine life clamshell mobile phone, key life testing machine, resistance friction test machine, fully automatic torque tester, mobile Units drop test, tape wear-resistant test machine, the mouse roller life test machine; six, rubber, plastic, tape testing machine series: wear test machine, folding / Wear-resistant test machine, winding machine, vertical / rebound test machine, the permanent distortion compression test machines, foam compression stress test machine, foam plastic repeated compression test machines, test material removed machine, plastic machine Determination of Melt Index , melting point tester, heat distortion temperature test trough, falling ball / drop down / DuPont impact test machine, to maintain constant temperature test tape machine, adhesive tape early bowls tester, hardness tester, peel strength testing machine; seven, footwear, leather , Testing Machine Series: friction test machine, add sulfur testing machine, conveyor-type Needle detector machine, friction dyeing fastness tester, testing machineDecoloration friction, standard light box, cold testing machine

主要产品包括：一、拉力强度、万能材料试验机：微机控制万能材料试验机、经济型万能材料试验机、微电脑拉力试验机、电动/手动（立式/卧式/双杆/单杆）拉力台、微电脑插拔力试验机、弹簧拉压试验机等；二、环境试验机系列：恒温恒湿试验箱、干燥箱、大型负载老化室、步入式恒温恒湿试验室、冷热冲击试验箱、UV耐候试验机、盐水喷雾试验机、老化试验箱三、纸箱、包装、家私试验机系列：微电脑纸箱抗压试验机、破裂强度试验机、跌落试验台、微电脑振动试验台、模拟汽车运输振动试验台四、电工器材试验机系列：插头引线弯折试验机、插头滚筒试验机、插头线吊重摆动试验机、插头线静态拉力试验机、突拉试验机、电源线折曲试验机、燃烧试验机、90度剥离强度试验机、电线扭转试验机、电线耐磨损试验机、可挠电线柔软度试验机、电线印刷体坚牢度试验机、线材测长率试验机、听筒线伸缩疲劳试验机、插拔力试验机、低温冷挠试验机、温升试验机、电线恒温球压试验机、灼热丝试验机、漏电起痕试验机、线材的短路/断路/高压/低压/绝缘/导通/误配测试仪；五、计算机、手机试验机系列：转轴寿命试验机、手机翻盖寿命试验机、按键寿命试验机、耐磨擦试验机、全自动扭力试验机、手机跌落试验台、纸带耐磨试验机、鼠标滚轴寿命试验机；六、橡胶、塑料、胶带试验机系列：磨耗试验机、耐折/耐磨试验机、曲折试验机、垂直/反跳弹性试验机、永久压缩歪度试验机、泡棉压缩应力试验机、发泡塑料反复压缩试验机、试料磨平机、塑料熔融指数测定机、融点测试机、热变形温度试验槽、落球/落垂/杜邦冲击试验机、恒温胶带保持力试验机、胶带初粘性滚球试验机、硬度计，剥离强度试验机；七、制鞋、皮革、试验机系列：磨擦试验机、加硫试验机、输送式检针机、磨擦染色坚牢度试验机、双锤磨擦脱色试验机、标准光源箱、耐寒试验机

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。