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cyclic
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  循环
    Effects of Cyclic Heat Treatment on Microstructures and Mechanical Properties of TiAl-based Alloy
    循环热处理对TiAl基合金组织与性能的影响
短句来源
    Cyclic Deformation Behavior and Fatigue Damage Mechanism of Copper Bicrystals
    铜双晶体的循环变形行为与疲劳损伤机制
短句来源
    SECONDARY CYCLIC HARDENING AND GRAIN BOUNDARY CRACKING IN HIGH PURITY Al
    高纯Al中出现的二次循环硬化与沿晶开裂
短句来源
    EFFECT OF CYCLIC STRESS ON CREEP RUPTURE STRENGTH OF A CAST SUPERALLOY WITH HIGH Al AND Ti CONTENTS
    循环应力对一种高铝钛铸造镍基合金持久强度的影响
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    A STUDY OF THE CYCLIC OXIDATION BEHAVIOUR OF FOUR SUPERALLOYS
    四种高温合金循环氧化性能的研究
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  “cyclic”译为未确定词的双语例句
    Fatigue Behavior and Fatigue Life Prediction of Metals under Multiaxial Cyclic Loading
    金属材料的多轴疲劳行为与寿命估算
短句来源
    FATIGUE-CRACK INITIATED FROM NOTCH TIP UNDER CYCLIC COMPRESSIVE LOAD
    压应力条件下缺口产生疲劳裂纹的研究
短句来源
    THE LOW CYCLIC FATIGUE BEHAVIOUR OF GH133 SUPERALLOY
    GH133合金高温低周疲劳研究
短句来源
    HIGH TEMPERATURE LOW CYCLIC FATIGUE BEHAVIOUR OF DIRECTIONALLY SOLIDIFIED Ni-BASE ALLOY DK3
    定向凝固合金DK3的高温低周疲劳行为
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    A Study on Low Cyclic Fatigue Properties of Steels
    钢材应变疲劳性能研究
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  cyclic
This family includes all modular representations of cyclic groups.
      
Universal Spectra and Tijdeman's Conjecture on Factorization of Cyclic Groups
      
Obviously every invariant subspace (under translation and modulation) is cyclic if it has a subspace WH frame.
      
Continuous Wavelet Transforms from Semidirect Products: Cyclic Representations and Plancherel Measure
      
Functions whose translates span Lp(R) are called Lp-cyclic functions.
      
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The microstructure in shot-peening surface plastic straining layer of several softening and hardening materials are investigated. It was found that this plastic strain is not the same of simple monotonic plastic strain, but a cyclic plastic strain. As a result of cyclic strain, material in the surface layer subjects to "cyclic hardening/softening"as it changes in the strain fatigue test. The appearence of cyclic hardening/softening depends on the virgin microstructure of materials and...

The microstructure in shot-peening surface plastic straining layer of several softening and hardening materials are investigated. It was found that this plastic strain is not the same of simple monotonic plastic strain, but a cyclic plastic strain. As a result of cyclic strain, material in the surface layer subjects to "cyclic hardening/softening"as it changes in the strain fatigue test. The appearence of cyclic hardening/softening depends on the virgin microstructure of materials and the shot-peening intensity. For the softening materials, the cyclic hardening is taken place during shot-peening, while for the hardening materials (martensite or maraging steels) , the cyclic softening is taken place at first, then cyclic rehardening is followed during shot-peening. It was found that the cyclic hardening/softening behaviours in the shot-peening surface layer are dependent on the variations of subgrain size, lattice distortion and excess dislocation density in the materials.

研究了软化和硬化材料表面喷丸应变层内的组织结构。结果表明,这种应变并不是一种简单的单凋塑性应变,而是循环塑性应变。循环应变使表层材料发生“循环硬化(或软化)”,与在应变疲劳中所发生的变化相类似。材料喷丸后发生循环硬化或软化,取决于材料的原始组织结构以及喷丸强度。对于软化材料,喷丸过程中发生循环硬化;而对于硬化材料(马氏体钢或时效马氏体钢),则首先发生循环软化,然后转为循环再硬化。试验表明,这种循环硬化(或软化)的性质取决于材料的亚晶粒尺寸,点阵畸变和位错密度。

Overload retardation behavior under different overload ratios and different crack lengths in a Ti-6Al-4V titanium alloy has been investigated.The effect of some major factors on retardation behavior is discussed.The retardation behavior can be considered as the results of interaction effects between overload and cyclic loads.It is suggested tha retardation process may be divided into five stages. From an analysis of the modes of fatigue fractures, the overloading process of fatigue crack growth in these...

Overload retardation behavior under different overload ratios and different crack lengths in a Ti-6Al-4V titanium alloy has been investigated.The effect of some major factors on retardation behavior is discussed.The retardation behavior can be considered as the results of interaction effects between overload and cyclic loads.It is suggested tha retardation process may be divided into five stages. From an analysis of the modes of fatigue fractures, the overloading process of fatigue crack growth in these tests can be regarded as mainly in a plane strain condition or a mixed mode in which the plane strain occurs predominantly. Thus, at a given overload ratio Qo1 the number of delay cycles No caused by an overload increases with a decrease of Ko1 under plane strain condition.In this paper, the Wheeler, Willenborg, Maarse, and Matsuoka models were selected in view of engineering application. An evaluation of the describing capacity and life prediction of these models on retardation behavior have been made. The Matsuoka model based on the crack closure concept was found comparatively to be in good agreement with the experimental results. It is also recognized that the experimental values of overload delay effect zone size are considerably greater than the calculated values suggested by the above mentioned models.

本文针对Ti-6Al-4V钛板的超载试验,着重研究了不同超载比及不同裂纹长度下的超载迟滞特性,讨论了影响迟滞效应的一些主要因素。认为迟滞效应是循环载荷之间交互作用的结果,并提出了迟滞过程可以分为五个阶段的看法。通过对裂纹扩展形式等因素的分析,认为本试验的疲劳裂纹扩展的超载过程,属于平面应变或以平面应变为主的混合型;在平面应变条件下,对于给定的Q_(o1)超载引起的迟滞循环数N_o,随着超载水平K_(o1)的减小而增加。 从应用观点出发,选择了Wheeler模型、Willenborg模型、Matsuoka模型和Maarse模型,从各模型对迟滞现象的解释能力、应用情况等方面作了较全面的比较和讨论。认为以闭合效应为基础的Matsuoka模型与实际情况符合较好;并发现各模型计算中所假定的迟滞影响区,均比实测的超载迟滞影响区要小得多。

The fatigue fracture of nodular cast iron is investigated by using the prin(?)iple and the method of the linear elastic fracture mechanics, Nodular cast irons whose znatrices are composed of ferrite, pearlite and 80% pearlite combined with bull's eye ferrite are investigated. Due to the difference in the matrix composition these three cast iron varies all exhibit different properties in strength, plasticityn ad toughness.The number of stress cycles N_0 for initiation of fatigue crack, the rate of fatigue crack...

The fatigue fracture of nodular cast iron is investigated by using the prin(?)iple and the method of the linear elastic fracture mechanics, Nodular cast irons whose znatrices are composed of ferrite, pearlite and 80% pearlite combined with bull's eye ferrite are investigated. Due to the difference in the matrix composition these three cast iron varies all exhibit different properties in strength, plasticityn ad toughness.The number of stress cycles N_0 for initiation of fatigue crack, the rate of fatigue crack propagation da/dN, the threshold stress intensity factor range △Kth and the total number of stress cycles N'_f for fatigue fracture were investigated with different loading regimes and different sharpness of the notch in the specimen. It has been found that △Kth in nodular cast iron is rather high; △Kth decreases as the percentage of pearlite increases, untill about 80% pearilite when it remains almost unchanged with further increases of percentage of pearlite; the variation of N_0 depends mainly on the strength of materials in caes of blunt notched specimens and on the plasticity of meterials in case of sharp notched specimens; da/dN decreases as plasticity increases; While N_f' increases as strength increases in blunt specimen under high cycle fatigue while N'_f increases in sharp notched specimen under low cyclic fatigue.The characteristics and micro fracture mechanism of fatigue crack initiation and propagation in nodular cast iron have been described and explained in the light of metallographic and electron fractographic observstions.

本文用线弹性断裂力学原理和方法研究稀土镁球墨铸铁的疲劳断裂问题.试验研究球墨铸铁为铁素体、珠光体以及珠光体加部分牛眼状铁素体等三种不同强度、塑性、韧性配合的基体组织.通过不同加载制度,不同缺口尖锐度试样的疲劳裂纹萌生期N_0、疲劳裂纹扩展速率da/dN、门槛值△K_(th)以及条件疲劳总寿命N_f的测定,得出主要看法为:球铁具有较高的△K_(th)值,随珠光体量增加△K_(?)下降,至80%珠光体后趋向稳定;疲劳裂纹孕育期的大小,在尖锐缺口时主要取决于塑性,较平缓缺口时主要取决于强度.疲劳裂纹扩展速率da/dN随塑性的增加而降低,低周疲劳,尖锐缺口试样,增加塑性有助于疲劳寿命的提高;高周疲劳,钝缺口试样,增加强度有助于疲劳寿命的提高.还通过电境断口分析,就球铁疲劳裂纹萌生、扩展的特征及其微观机制进行了简明的描述和解释.

 
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