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fatigue fracture mechanism     
相关语句
  疲劳断裂机理
     RESEARCH ON FATIGUE FRACTURE MECHANISM OF SPRING END COIL
     高应力弹簧端圈疲劳断裂机理研究
短句来源
     A new method of cropping bar based on the fatigue fracture mechanism was presented, which utilized the variant frequency vibration and the stress concentration at the bottom of V shaped groove on the bar. The rotary speed of eccentric blocks was adjusted by the frequency-converter to control the vibration amplitude and the exciting force to realize precision cropping.
     针对棒料的精密下料问题,给出一种基于疲劳断裂机理的新型变频振动下料方法,利用变频振动和棒料表面V型槽的应力集中效应,通过变频器改变偏心块的旋转速度,控制在不同下料阶段的位移振幅与激振力,实现棒料的精密下料。
  疲劳断裂机制
     EFFECT OF STRAIN RATES ON FATIGUE FRACTURE MECHANISM IN LOW CARBON STEEL
     应变速率对低碳钢疲劳断裂机制的影响
短句来源
  疲劳破坏机理
     In this paper t he fatigue fracture mechanism of 50CrV 4 steel for automotive suspension coil spring is mainly discussed.
     本文主要分析了轿车悬架螺旋弹簧用钢50CrV4的疲劳破坏机理
短句来源
  疲劳断裂的机理
     The fatigue fracture mechanism of main bearing cage is analysed and investigated for aircraft engine taking WP6 for example.
     以WP6发动机轴承为例,对航空发动机主轴轴承保持架疲劳断裂的机理进行了分析探讨。
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      fatigue fracture mechanism
    The simulation can explain the fatigue behavior of BRF experiments and provide a deep insight into the fatigue fracture mechanism of SMAs.
          
    From the results, crack initiation and propagation mechanisms were cleared and fatigue fracture mechanism maps were constructed.
          
    Fatigue fracture mechanism maps at room temperature and 573 K for a type 304 stainless steel were constructed by correlating the crack propagation rate with information obtained on the fracture surface.
          
    Fatigue fracture mechanism maps for a type 304 stainless steel
          
    Consequently, the fatigue fracture mechanism was modified, a lower crack closure developed, and the fatigue threshold reduced to that of the overaged composite.
          
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    A study is made of the fatigue crack initiation and propagation mechanisms in 20SiMn2MoV, 34CrNi3Mo, 45Cr low alloy structural steels and T12 tool steel using electron fractography, the 45Cr and T12 haying been treated to different tempering conditions.In region I with Iow ⊿K values, the fatigue crack initiation and propagation mechanisms may change from slip-plane decoherence to intergranular fracture with increasing yield strength, those mechanisms are sensitive to microscopic structures.In region II with...

    A study is made of the fatigue crack initiation and propagation mechanisms in 20SiMn2MoV, 34CrNi3Mo, 45Cr low alloy structural steels and T12 tool steel using electron fractography, the 45Cr and T12 haying been treated to different tempering conditions.In region I with Iow ⊿K values, the fatigue crack initiation and propagation mechanisms may change from slip-plane decoherence to intergranular fracture with increasing yield strength, those mechanisms are sensitive to microscopic structures.In region II with medium ⊿K values, the crack propagation mechanism is the formation of striations in medium and low strength steels.In region III with high ⊿K values, the crack propagation mechanism is of a mixed striation and static fracture type.This paper discusses the relation between the change in the fracture mechanisms and that is material strength. It summarizes the conditions for fracture mechanism transition in the three regions, where for a fatigue fracture mechanism map is obtained.

    本文采用电子显微断口分析方法,对20SiMn2MoV低碳马氏体钢,45Cr和T12钢淬火不同回火态和34CrNi3Mo电站大锻件用铜的疲劳裂纹萌生与扩展机制进行了研究.并着重在材料的不同强塑配合引起断裂机制变化的关系中做了探讨;总结了三个区之间机制转变的条件;给出了较初步的疲劳断裂机制图;从材料强度方面提出了各阶段的主要控制因素,从而为改善材料疲劳抗力提供了一些依据.

    Based upon the fatigue crack propagation maoro-features and fracture mechanism for medium or low carbon constructional alloy Steels in room temperature and air environment, the fatigue fracture-mechanism maps (FFM map) were put forward.

    本文在中低碳合金结构钢,室温大气条件下取得的疲劳裂纹扩展宏观特性和微观断裂机制观测的有限数据基础上,对疲劳断裂机制图的制作和意义作了初步的探讨。机制图I以σ_s/K_(IC)和K_(max),机制图Ⅱ以K_(max)/K_(IC)和γ_B~C/d(即ΔK~2/12πσ_8~2d)分别为双对数直角座标轴。在这两种平面空间里,通过对实验数据的归纳,绘出了若干个不同断裂机制的区域及da/dN的数值范围。对应于一种材料状态,疲劳裂纹扩展过程在机制图中表现为穿过特定若干区域的一直线。疲劳断裂机制图对抗疲劳材料的选择、研制和改善及失效分析,将有一定的指导意义。

    When a variety of fracture mechanisms, especially fatigue fracture mechanisms of dual-phase struture with ferrite and martensite is studied, the tilt cross-sectioning technique is an effective method to observe the fracture appearance and microstructure in the same field of view. With this method not only the fracture process of fatigue crack (including the primary and se ondary cracks) can be observed, but also the fracture appearance retated to the microstructure insid...

    When a variety of fracture mechanisms, especially fatigue fracture mechanisms of dual-phase struture with ferrite and martensite is studied, the tilt cross-sectioning technique is an effective method to observe the fracture appearance and microstructure in the same field of view. With this method not only the fracture process of fatigue crack (including the primary and se ondary cracks) can be observed, but also the fracture appearance retated to the microstructure insid can be studied. There is no report about the preparation of the acceptable specimen. In this paper a simple and useful method for sample preparation has been given.

    在研究铁索体加马氏体双相组织的各种断裂机制,尤其是疲劳断裂机制时,比较有效的方法是能在同一视野中同时观察断口形貌与显微组织,即所谓的斜剖断口法。利用这种方法不仅可以观察疲劳裂纹(包括主、次裂纹)的扩展途径,并且可以研究断口形貌与内部显微组织的对应关系,以揭示双相组织的疲劳断裂机制。但是,对于如何制备合乎要求的样品,有关文献尚未报导,我们在实践中摸索出一种简单而实用的方法,现介绍如下。

     
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