| 1. | When strain amplitude is lager than 0 . 5 % , it is better to employ the fatigue data of 3 / 10 life section ; as to strain amplitude lower than 0
5时，采用3 10寿命阶段的疲劳特性参数预测结果较符合实验值；但当应变幅小于0 |
| 2. | The results indicate that the relationship between the saturated stress ( , . ) and the plastic strain amplitude ( sp ) both at room temperature and 400 can be expressed by a power law relation s = ksepns
结果表明，无论在室温还是在400 ，循环饱和应力， 、随塑性应变幅二，的变化满足乘幕关系ct 、一k “二， ” ‘ 。 |
| 3. | In addition , the cyclic softening under the strain amplitude less than 0 . 8 % can be explained by " grain - rotation induced cyclic softening " , and the cyclic hardening in the higher strain amplitude was attributed to twinning
在低应变幅区，合金在室温下的低周疲劳性能明显优于在400下的低周疲劳性能。但随着应变幅的增加，室温和400下合金的疲劳寿命趋于接近。 |
| 4. | Using half - life data , the best prediction result if from the exponential dissipation model presented in this paper . the investigation of the influence of fatigue factors on fatigue life prediction shows : the prediction result from half - life data is n ' t the best one
采用不同疲劳寿命阶段获得的疲劳特性参数对两种状态试样分别进行疲劳寿命预测，结果表明：对于光滑试样，当应变幅大于0 |
| 5. | Through research into the low - cycle fatigue behavior of gh4145 / sq , we found out that the control of strain at any level is not a stable course but has three obvious stages . the first stage is a rapid cyclic hardening course for any strain control
对gh4145 / sq合金在总应变幅控制下的对称拉压低周疲劳研究表明：在循环形变过程中合金主要表现为初始疲劳硬化、随后疲劳软化及最终失稳断裂三个阶段，疲劳硬化软化行为与作用应变幅相关。 |
| 6. | A new prestressed bowshaped structure strain multiplier was designed to solve problem which strain amplitude is much lower than the threshold of fatigue life gage , and this strain multiplier take the advantages of entire structure , lower stiffness , good reliability and convenience to use
设计出一种弓形预应力结构应变倍增器,解决了桥梁应变幅值远远低于疲劳寿命计门槛值这一关键问题,此倍增器具有整体性强、刚度低、可靠性好、使用方便等优点。 |
| 7. | It can be noticed that both r and t specimens show initial hardening and subsequent softening at the strain amplitude higher than 0 . 8 % and cyclic softening from the beginning to fracture under strain amplitude less than 0 . 8 % at room temperature , and the cyclic flow stress was always lower in r specimen than in t specimen at the same strain range
且在相同的应变幅下， t向试样比r向试样具有更高的循环流变应力。此外，对r向及t向试样，低应变幅下呈现出循环软化现象是因为晶粒旋转导致循环软化；而在高应变幅下发生循环硬化是由于孪晶作用的结果。 |
| 8. | For the cyclic deformation under a given strain at room temperature , cyclic softening is usually displayed till to failure in the lower range of strain ; however , cyclic hardening is displayed in the early stage in the higher range of strain , subsequent cyclic softening in the later stage and till to failure
对于室温下恒应变幅的循环变形，在应变幅较低时表现为循环软化直至疲劳破坏;在应变幅较高时，循环变形的初期为循环硬化，随后是循环软化直至疲劳破坏。 |
| 9. | The electrical cut scanning mirror shows : this bilinear behavior results from different cracking ways under high and low strain amplitudes , that is , elastic cracking and brittle cracking respectively . cyclic hysteresis energy is an important fatigue parameter . the total cyclic hysteresis energy of gh4145 / sq increases gradually as strain amplitude goes from 1 % to 0 . 5 % , but it decreases when strain amplitude is lower than 0 . 5 %
在高温低周疲劳下， gh4145 / sq合金的循环滞?能具有如下特征：在1 0 . 5应变幅范围内，循环总滞?能是一个逐渐增大的过程，而当应变幅小于0 . 5时，总滞?能随应变幅减小而趋于减小；半寿命处的循环滞迥能和总滞?能与寿命之间的关系曲线表现出双线性特征，转折点对应0 . 5应变幅。 |
| 10. | The static triaxial test is performed on composite cemented clay samples and parameters of duncan - chang model are obtained considering the effects of replacement ratio and confining pressure . the effects such as replacement ratio , strain amplitude and confining pressure on the dynamic modulus and damping ratio of composite cemented clay samples are analyzed through undrained dynamic triaxial test . fitting equations estimating the dynamic modulus and damping ratio through regression analysis are deducted with the effects of replacement ratio , strain amplitude and confining pressure
通过不排水动三轴试验详细地分析了置换率、应变幅和围压等因素对水泥土复合试样动模量和阻尼比的影响，根据有关数据，得到了较为完整的复合试样的动力变形曲线，通过回归分析方法，得到了考虑置换率，应变幅和围压影响的水泥搅拌桩复合试样动模量和阻尼比的拟合公式。 |
