| 1. | The highest stress range occurs near the support .
其最高应力范围发生在近支撑处。 |
| 2. | The stress range histogram was used to estimate the effective root-mean-square stress range .
应力范围直方图可用作估算等效均方根应用力范围。 |
| 3. | Allowable stress range of fatigue
疲劳容许应力幅 |
| 4. | The results indicate that the elastic operating stress range of a torsional axis is extended greatly by pre - twist process and the main reason lies on surface residual stress
结果表明，预扭后扭力轴弹性工作应力?围得到极大扩展，其主要原因在于预扭塑变形成的表面残馀应力。 |
| 5. | The fatigue test is based on nominal stress range . at the last , analyzing and estimating the outcome , testified that fatigue intensity is not dominant in the process of designing the wushan yangtze bridge
疲劳试验按设计名义应力幅进行，对试验结果进行分析评价后，证实了巫山长江大桥的节点疲劳不控制设计。 |
| 6. | At the same time , a fatigue damage evolution law based on the theory of cumulative fatigue damage is presented , using the electrical resistance of material . and the electrical resistance change is validated by the whole - bend experiments under different stress ranges
同时通过电阻建立了基于损伤累积理论的疲劳损伤演化规律，对不同应力幅水平下的存弯疲劳实验试样的电阻损伤变量加以实验验证。 |
| 7. | To prevent premature failure of the reinforced plastic fiberglass sucker rod , high quality products should be purchased , proper wells should be selected , the rod string design should be based on the stress range chart and operation and management should be carried out according to requirements
为防止玻璃钢抽油杆早期失效，应严把产品进货质量关；正确选择油井；按应力范围图进行玻璃钢杆柱设计；按要求作业施工；完善生产管理措施。 |
| 8. | Statistic analysis on fatigue load effect and equivalent stress range of steel crane structures in service is carried out . the stress range distribution in whole life is deduced by the spot measurement little sample stress - time process . meanwhile the statistic analysis on the fatigue resistance process is conducted , according to fatigue data of all kinds of structural joints in domestic and overseas , which is foundation with , establish the fatigue reliability model
2 、在大量调查的基础上，对吊车梁所承受的疲劳荷载效应与等效等幅应力进行了统计分析，同时根据国内外有关各构造细节的疲劳资料对疲劳抗力参数进行了统计分析，为建立疲劳动态可靠性分析模式奠定基础。 |
| 9. | A time - variant reliability formulation is presented in this paper to account for the effects of fatigue , corrosion and maintenance actions on the first yield reliability of midship section modulus . a probabilistic model for long - term distribution of wave - induced fatigue stress range is established . for the purpose of obtaining the performance of structure that stands random fatigue load , the concept of stress parameter and equivalent stress range are introduced
船舶在由波浪弯矩引起的交变应力作用下，船体构件焊接点处的微小裂纹逐渐扩展；同时，随着船龄的增加，众多结构构件遭受腐蚀的作用；从而使船体梁剖面模数减小，船体梁承载能力衰减，船舶结构的安全性将受到相当大的影响。 |
| 10. | The relaxation resistance of the nitinb alloy affects the strength of the nitinb pipe coupling at high temperature , so that the relaxation experiment at various temperatures and various initial stresses was preformed to investigate the relaxation resistance of the nitinb alloy . the results show that nitinb alloy has good relaxation resistance in the temperature range 300 ~ 400c and the initial stress range 260 ~ 360 mpa , therefore the nitinb pipe coupling can work safely under the condition of temperature above 300c and initial stress no more than 360mpa
Nitinb合金的抗松弛性能必将影响nitinb管接头的高温强度，于是首先对nitinb合金在不同温度不同初始应力下的抗松弛性能进行了研究，结果表明：温度在300 400 ，初始应力在260 360mpa时， nitinb合金抗应力松弛性能良好，用其制备的管接头能在温度不超过300 、应力不超过360mpa的条件下安全地工作。 |
