高温蠕变损伤是由于过热引起的,过热使金相组织内部产生蠕变空洞,在热应力下空洞扩展连接而形成蠕变裂纹。
Creep damage is mainly caused by superheat. Because of superheat, creep cavities are formed inside microstructure, under heat stress condition, growth and join of cavities induce creep cracking.
利用冻粘土试件进行了三轴蠕变试验,从而获得了复杂应力状态下的蠕变曲线。
The specimens of frozen clay are used for carrying out the long-term creep tests under triaxial stress states so that the creep curves of the frozen clay are derived.
结果人体硬脑膜的蠕变特征为:初始应变和所加的应力大体成线性关系;蠕变应变随时间缓慢增加。
Results the creep properties of human dura presented a linear-relationship between initial strain and stress, and the creep strain increased slowly with time.
随施加应力的增大,纤维的恒蠕变速率增大,抗蠕变断裂时间变小,蠕变断裂伸长变小。
The constant creep rate was increased and creep-resistance breaking time and creep breaking elongation were decreased with the increase of applied stress.
通过规则齿形结构面在双轴应力条件下的蠕变试验,对规则齿形结构面剪切蠕变特性进行了深入的研究,分析了规则齿形结构面蠕变的基本规律。
Testing study is made on the creep characteristic of regularly dentate discontinuity in the condition of two-axial stresses, and the normal creep rule of regularly dentate discontinuity is analyzed.
同时,对高温结构提出一种简便可行的蠕变恢复应力分析方法,并通过算例说明蠕变恢复的影响。
A simple and efficient analytical method of creep recovery stress is provided. The effect of creep recovery is demonstrated by a numerical example.
瞬时剪切行为存在加载速率、温度相关性;剪切蠕变曲线形状和蠕变寿命与温度及应力大小有关。
Shortterm shear behaviors depend on loading rate and test temperature while the shapes of the shear creep curve and the creep lives depend on test temperature and stress.
结果显示动态应变呈循环蠕变状态,蠕变的大小、速度与循环应力幅值有关。
The experimental results showed that the dynamic strain has feature of cyclic creep. Cyclic loading affected the creep and creep speed.
试验结果表明,横向稳定蠕变阶段的应力阈值低于轴向稳定蠕变阶段的应力阈值;
The experimental result shows that the lateral stress threshold of the second creep stage is less than that of axial stress threshold.
通过大量的冻结粘土单轴蠕变试验,获得了单轴应力状态下的蠕变曲线及其参数。
Through a lot of creep test of frozen clay under single-axial stress, the curves and parameters of creep under single-axial stress state are obtained.
对臂丛神经上干进行应力松弛实验和蠕变实验,得出应力松弛、蠕变实验数据和曲线。
Superior trunk of brachial plexus nerve was performed stress relaxation test and creeping test, and data and curve of stress relaxation test and creeping test were obtained.
介绍了汽轮机转子、主蒸汽管道、汽缸和阀壳稳态蠕变应力和非稳态蠕变应力的计算方法,采用大型有限元分析计算程序计算汽轮机部件的非稳态蠕变应力和稳态蠕变应力。
The method takes into consideration both for steady and unsteady creep stresses of rotors, pipes, casings and valve housings to be determined with the help of finite element analysis programs.
采用CSR法对蠕变内应力的测试进行了研究,并在材料试验机上实现了CSR法的蠕变内应力测试。
The research was carried out on the basis of CSR to measure creep internal stress.
利用自行改装后的三轴蠕变仪对海相沉积的营口软土进行蠕变试验,获得了在不同围压、不同偏应力条件下的剪切应变与时间关系数据。
The relationship between shear strain and time of Yingkou soft soil is obtained under a series of different cell pressures and different deviator stresses.
本文给出了尼龙1010材料在不同温度和不同应力水平下的实验结果,提出了包含蠕变激活能的蠕变方程,该方程与实验数据良好符合。
Creep results on Nylon 1010 are given in series of temperature and stress levels. Creep equation containing a creep activation energy is suggested, and it is in agreement with experimental data.
在试验研究中本文考虑了各种金属在恒应力与变应力下的行为,应力集中,加载方式对蠕变破坏的影响;
In experimental studies the authors considered the behaviour of various metals under constant and variable stresses, stress concentration, influence of way of loading on creep rupture;
当应力达到一定的水平时,岩石加速蠕变损伤发生后的衰减蠕变和稳态蠕变。
When the stress reaches a certain level, the accelerated creep damage of rock occurred after the decay creep and steady creep.
在相同偏应力条件下,不排水常规三轴压缩蠕变的应变值要小于减压三轴压缩蠕变的应变值;
The value of strain of undrained conventional triaxial compression creep is less than that of reduced triaxial compression creep under the same deviator stress;
局部蠕变损伤理论的实质就是试样是多种不同蠕变性能材料的统一 ,并由蠕变应力再分布得到证实。
The essence of localized damage theory is that materials could be divided into several different groups with different creep damage and proved by stress redistribution.
结果表明,用CSR法测定高温构件的蠕变内应力是可行的,将蠕变内应力用于高温构件的剩余寿命预测是有效的,并可克服一般外推方法的不足。
The results showed that it was viable to use CSR measuring creep internal stress of high temperature components and effective to forecast residual life of high temperature components using …
而以蠕变极限为失效准则的蠕变内应力法与常规的以蠕变试验为基础的等温外推法相比,还具有试验时间短的优点。
It is also shown that under the creep limit failure criterion, the creep internal stress method has the advantage of less test time in comparison with the isothermal...
试验结果表明:2618铝合金表现出较高的蠕变应力指数,在引入门槛应力后,该合金的蠕变行为可得到满意解释;
It was found that 2618 aluminum alloy exhibits a higher creep stress exponent. The creep behaviors of the alloy can be described by using threshold stress.
基于蠕变理论提出了振动时效与循环蠕变在力学本质上的相关性,并对交变应力幅、温度和材料特性等共同影响因素进行了分析。
Based on the creep theory, the mechanical relationship of VSR and cyclic creep was discussed, and common factors such as stress amplitude, temperature and material properties were analyzed.
对应力松弛蠕变实验数据进行归一化处理,得出归一化应力松弛函数、蠕变函数及曲线。
The stress relaxation data were dealed with normalization, we get out normalization stress relaxation function, creep function and curve.
对应力松弛蠕变实验数据进行归一化处理,得出归一化应力松弛函数、蠕变函数及曲线。
The stress relaxation data were dealed with normalization, we get out normalization stress relaxation function, creep function and curve.
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