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冲击疲劳     
相关语句
  impact fatigue
     Corrosion Impact Fatigue Behavior of AF1410 Steel and 300M Steel
     AF1410与300M钢的腐蚀冲击疲劳行为
短句来源
     THE INFLUENCE OF MICROSTRUCTURE ON IMPACT FATIGUE CRACK INITIATION LIFE OF 40CrNi2Si2MoVA STEEL
     40CrNi2Si2MoVA钢的显微组织对其冲击疲劳裂纹起始寿命的影响
短句来源
     The Feature of Fracture at Initial Region and Mechanism of Crack Initiation under Repeated Impact Fatigue Load for 300M Steel
     300M钢冲击疲劳断口起裂部位宏观特征和裂纹萌生机制
短句来源
     THE INFLUENCE OF CARBIDE REFINING TREATMENT ON THE IMPACT FATIGUE PROPERTIES OF T10 STEEL
     细化处理对T10钢冲击疲劳抗力的影响
短句来源
     Analysis of impact fatigue damage in hammer foundation
     锻锤基础的冲击疲劳损伤分析
短句来源
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  shock fatigue
     Formation Mechanism of Thermal Shock Fatigue Crack of Cemented Carbide YG10
     YG10硬质合金热冲击疲劳裂纹形成机制
短句来源
     Formative Mechanism of Thermal Shock Fatigue Crack of Cemented Carbide YG8
     YG8硬质合金热冲击疲劳裂纹的萌生机制
短句来源
     Thermal Shock Fatigue Behavior of Ceramets Containing 20% Nickel
     含20%Ni金属基陶瓷的热冲击疲劳
短句来源
     FORMATIVE MECHANISM OF THERMAL SHOCK FATIGUE CRACK OF CERMETS
     金属陶瓷热冲击疲劳裂纹形成机制
短句来源
     The factors analysis of the hydro-extractor shaft crack and the method of increasing the shaft resistance to shock fatigue strength
     压力机轴断裂因素分析及提高抗冲击疲劳强度的方法
短句来源
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  fatigue impact
     The results show that hot-forged cast dies take thermal wear, plastic deformation, thermal fatigue, impact fatigue fracture and brittle fracture as predominant failure patterns.
     结果表明,精铸热锻模的主要失效形式为热磨损、塑性变形、热疲劳裂纹、冲击疲劳破断和脆性断裂。
短句来源
     Using the authors developed numerical simulation software of temperature field,the solidification process of wear resisting cast balls was numerically simulated. Based on the simulation and the law of temperature distribution of solidification process for the cast ball,the shrink holes of the cast balls were removed by adjusting the foundry parameters. Therefore fatigue impact test shows that the diameter 127?
     利用温度场数值模拟对低铬硼铸球的凝固过程进行了计算·在研究铸球凝固过程温度分布规律的基础上 ,改进了铸造工艺 ,消除了缩孔等缺陷·经落球冲击疲劳寿命试验机测定 ,直径 12 7铸球落球次数 >80 0 0次·
短句来源
     The binding strength of interface can be improved by selecting perfect binder, thus the composites have better resistance to fatigue impact.
     选用合适的粘结剂,可以改善界面的结合状况,提高复合材料的抗冲击疲劳能力。
  impact-fatigue
     Application of Impact-fatigue Test to High Chromium Cast Iron
     冲击疲劳试验在高铬铸铁研究中的应用
短句来源
     The procedures for determining the fatigue crack initiation life and the crack propagation rates by using the impact-fatigue testing set were proposed,and the expression for correlation between the impact energy and the stress intension factor range,ΔK,was developed in the present study.
     提出了利用冲击疲劳试验机测定疲劳裂纹起始寿命和裂纹扩展速率的原理和方法,建立了应力强度因子范围△K 与冲击能之间的定量表达式。
短句来源
     The results of the ball-dropping impact-fatigue test and impact abrasiveness test showed that the impact-fatigue exfoliation resistance and anti-abrasiveness property of the developed as-cast and stress-relieving treated high chromium-silicon wear-resistant cast iron were better than the Cr15 martensite wearresistant cast Iron.
     冲击疲劳落球试验和冲击磨损试验结果表明,研制的铸态去应力处理的高铬硅耐磨铸铁抗冲击疲劳剥落和抗冲击磨料磨损性能优于马氏体Cr15耐磨铸铁;
短句来源
     Experimental Study on Impact-Fatigue Life of Commercial Low Alloy Steels' Weld
     常用低合金钢焊接接头冲击疲劳寿命的试验研究
短句来源
     The fatigue crack initiation life and the crack propagation rates of super high strength steel under impact-fatigue loading were experimentally deter- mined,and the corresponding expressions were also given.
     实验测定了超高强度钢的冲击疲劳裂纹起始寿命与裂纹扩展速率,并给出了相应的表达式。
短句来源
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      impact fatigue
    AISI 4615 steel differential gears were plasma carburized at 1040 °C for performance tests to determine whether the more rapid carburization at the higher temperature would have any deleterious effect on impact fatigue life.
          
    Static and impact fatigue behaviour of borosilicate glass
          
    Impact fatigue study was conducted in an improved pendulum type repeated impact apparatus specially designed and fabricated for determining single and repeated impact strength.
          
    Using a square waveform as applicable to the present impact tests and fracture mechanics interpretation, the number of cycles to failure during impact fatigue tests were predicted from quasi-static fatigue measurements.
          
    Impact fatigue behaviour of carbon fibre-reinforced vinylester resin composites
          
    更多          
      shock fatigue
    Single-quench thermal shock and thermal shock fatigue tests were performed in a room-temperature distilled water bath on glass microscope slides.
          
    An exploratory investigation of cumulative shock fatigue
          
      fatigue impact
    We also used: the Beck Depression Inventory (BDI) for depression, the Tempelaar Social Experience Check-list (SET) for social activities and the Fatigue Impact Scale (FIS).
          
    Construction and validation of a fatigue impact scale for daily administration (D-FIS)
          
    The fatigue impact scale (FIS) was developed previously as a symptom-specific profile measure of health-related quality of the (HRQoL) for use in medical conditions in which fatigue is a prominent chronic symptom.
          
    Items for the daily fatigue impact scale (D-FIS) were selected from the pool of original FIS items through Rasch analyses of existing data.
          
    Rasch analyses were used to further reduce the scale to a minimum number of items that represented a unidimensional measure of self-reported fatigue impact.
          
    更多          
      其他


    In present work, the influence of three diffsre.it microstructures on the mechanical properties and the fractures of the marteasite type α-β titanium alloy, Ti-6.5Al-3.5Mo-2Zr-0.3Si, was investigated. These three types of microstructures are the equiaxed structure with the volume fraction of equiaxed a about 50%; the mixed structure, consisting of the nearly equiaxed a and the distorted acicular a morphology ;and the lamellar structure which consists of Widmanstatten and grain boundary α. It was found that the...

    In present work, the influence of three diffsre.it microstructures on the mechanical properties and the fractures of the marteasite type α-β titanium alloy, Ti-6.5Al-3.5Mo-2Zr-0.3Si, was investigated. These three types of microstructures are the equiaxed structure with the volume fraction of equiaxed a about 50%; the mixed structure, consisting of the nearly equiaxed a and the distorted acicular a morphology ;and the lamellar structure which consists of Widmanstatten and grain boundary α. It was found that the tensile, impact, high cycle fatigue and the room temperature tensile properties after prolonged exposure at 500℃ of the equiaxed structure are superior to those of the mixed and lamellar structures. The highest stress-rupture and creep strength were obtained in the mixed structure which appeared to have a better combination of the properties than the others. The scanning electron fractographs showed that the dimple patterns were observed in the materials with equiaxed and mixed structures. The fractures of the material with the lamellar structure were characterized as the intergranular fracture with the mechanism of microvoid coalescence.

    本工作对比研究了一个马氏体型α-β钛合金(Ti-6.5Al-3.5Mo-2Zr-0.3Si)三种类型退火组织的机械性能和电子断口相的特征。这三种类型的组织是:等轴组织(等轴初生α体积分数在50%左右)、混合组织(由接近等轴的α颗粒和歪扭的片状α交替排列的组织)和片状组织(片状α+β的魏氏组织+晶界α)。发现在拉伸、冲击、疲劳、500℃长时热暴露后的室温拉伸性能等方面,等轴组织优于另外两种组织,而在500℃的持久强度和蠕变强度方面,则混合组织优于其它两种组织。混合组织具有较好的综合性能。等轴组织和混合组织的电子断口相的特征是初窝,片状组织的断裂特征则为微孔聚合型的晶间断裂。

    The behavior and mechanism of the tempered martensite embrittlement(TME) of an ultra-high strength steel 30CrMnSiNi2A, subjected to oil quench-ing from 900℃ and tempering at various temperatures below 600℃, arestudied in this paper. The experiments carried out include determination ofmechanical properties, measurement of quantities of retained austenite, examina-tion of microstructures, and fraetographies. The results are summarized asfollows: 1. TME is observed in the 30CrMnSiNi2A steel oil quenched and tem-pered....

    The behavior and mechanism of the tempered martensite embrittlement(TME) of an ultra-high strength steel 30CrMnSiNi2A, subjected to oil quench-ing from 900℃ and tempering at various temperatures below 600℃, arestudied in this paper. The experiments carried out include determination ofmechanical properties, measurement of quantities of retained austenite, examina-tion of microstructures, and fraetographies. The results are summarized asfollows: 1. TME is observed in the 30CrMnSiNi2A steel oil quenched and tem-pered. The behavior of TME is markedly affected by straining rate, and thisis attributable to different embrittlement machanisms. 2. At high rate of strain (i.e. impact test with Mesnager U-notch speci-men), the impact toughness decreases in the tempering temperature range of350-550℃. The minimum value of impact toughness is observed at about 450℃.Therefore, it may be called 450℃ embrittlement. This embrittlement is mainlyattributed to noncontinuous precipitation of cementite formed by the decomposi-tion of retained austenite films at the boundaries of martensite laths or aroundthe M/A island structures. In this case, the fractograph looks like a mixturetype of transgranular quasi-cleavage and dimple. 3. At lower rate of strain (i. e. the plane strain fracture toughness testand the impact-fatigue test), the fracture toughness and impact-fatigue lifedecrease in the tempering temperature range of_300-400℃. The minimum valuesof these are observed at about 350℃. Therefore, it may be called 350℃ embrit-tlement. This embrittlement is mainly attributed to decreasing mechanical sta-bility of retained austenite, which in turn greatly favours the formation ofhigh carbon content martensite located in interlaths during plastic strain. In this case, the crack propagates mostly along the lath boundaries and seldomthrough the laths. 4. Increasing the mechanical stability of retained austenite is one im-portant way to improve the combination of strength and toughness of 30CrMn-SiNi2A steel subjected to low tempering temperature. The mechanical stabilityof retained austenite can be controlled by tempering. Consequently, this resultprovides a general theoretical basis for laying down tempering temperature ofother ultra-high strength steel. The experiment indicates that optimum combination of strength, toughnessand impact-fatigue life for 30CrMnSiNi2A steel can be obtained through oilquenching and tempering at about 250℃. This result is attributed to the highestmechanical stability of its retained austenite.

    本文研究了超高强度钢30CrMnSiNi2A的回火马氏体脆性(以下简称TME)及与之有关的机械性能,结果表明:该钢TME的表现行为随着加载条件的不同而异。在高速加载条件下,即冲击韧性试验时,TME发生在350~550℃回火温度区间;在低速加载条件下,即静态断裂韧性或冲击疲劳试验时,TME发生在300~400℃回火温度区间。通过在适当温度(200~300℃)回火,可提高其残余奥氏体γ_R的机械稳定性,从而获得良好的强韧化效果。实践证明,在250℃附近回火可获得强度、韧性和冲击疲劳寿命的最佳配合。

    The continuous cooling transformation curve for 18Cr2Ni4WA steel hasbeen experimentally determined. The relationships between microstructures--obtained under different cooling rates with optical and electron microscope--andmechanical properties have been studied. The following conclusions may be drawn: (1) Microstructures and mechanical properties of the steel are controlledby cooling rate. Lath martensite, mixture martensite and bainite, bainite oreven all granular bainite have been obtained respectively under...

    The continuous cooling transformation curve for 18Cr2Ni4WA steel hasbeen experimentally determined. The relationships between microstructures--obtained under different cooling rates with optical and electron microscope--andmechanical properties have been studied. The following conclusions may be drawn: (1) Microstructures and mechanical properties of the steel are controlledby cooling rate. Lath martensite, mixture martensite and bainite, bainite oreven all granular bainite have been obtained respectively under different cool-ing rates. Martensite/retained austenite (M/A) island of certain amount andsizes are found in different microstructures stated above. (2) When the coolig time is about an hour from 900℃ to 270℃ the mainmicrostructure of steel is granular bainite and its overall properties are betterthan others. Compared with oil quenching, impact toughness a_k is increased by37%; fracture toughness J_(0.05), 105%; rotating beam fatigue limit σ_(-1), 5%;impact fatigue life N_f, 33%; and crack propagation rate da/dN is lower. Butthe strength σ_b of 120 kg/mm~2 can still be assured (tempering temperature220℃). Therefore this quenching regime is the best one. (3) (M/A) islands of certain amount and sizes in microstructure canretard crack propagation effectively. According to this paper's experiments therelationship among impact fatigue life (N_f), diameter (D) of (M/A) islandand mean distance (λ) between (M/A) islands can be expressed by: Nf= 1/λ~(1.166)(λ-D)~0.213 (4) The relationship between fracture toughness K_(10), other mechanicalproperties and mean distance (λ) between (M/A) islands can be expressed by: K_(10)=2π/3·ε_f·E·σ_b·e~(n_2ψ)·λ (1/2)

    本文测定了18Cr2Ni4WA钢奥氏体连续冷却转变曲线,分析了不同冷速下的显微组织,研究了冲击疲劳、旋转弯曲疲劳、断裂韧性和常规机械性能,讨论了组织和性能的关系。结果表明:该钢的显微组织依冷速不同可分别获得板条马氏体、板条马氏体和贝氏体、贝氏体、以至全部为粒状贝氏体。冷却时间约一小时得到以粒状贝氏体为主的组织,其综合机械性能优于其他组织。不同冷速的组织中均存在一定数量和尺寸的(M/A)岛,对疲劳裂纹扩展有阻碍作用,可提高疲劳寿命。

     
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