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裂纹
相关语句
  flaw
    The Flaw Inspection of Fatique craacks in the Tail structure of Boeing 737 200/300/500 Aircrafts
    波音 737-200/300/500 飞机尾部结构疲劳裂纹的探伤检查
短句来源
    A reliability analysis methodology based on the probability fracture mechanics is developed for the wing with main and subordinate components under conisdering several factors, such as crack detection probability, inspection interval, initial flaw distribution, crack growth,residual strength,etc. . The initial fatigue quality(IFQ)of a structural components is represented by an equivalent initial flaw size (EIFS).
    本文在综合考虑裂纹检出概率、检查间隔、初始裂纹尺寸分布,裂纹扩展、剩余强度分布等因素的条件下,提出了基于概率断裂力学原理的主副梁式机翼结构的破坏危险性分析方法。
短句来源
    improved method for determining the parameters of equivalent initial flaw size(EIFS)distribution is set up in this paper. The time to crack initiation(TTCI)values corre- sponding to gived reference crack size for every specimens in several stress level are obtained. These TTCI values are translatcd into EIFS values bv EIFS master equation.
    通过结构细节当量初始缺陷尺寸(EIFS)控制方程将各应力水平和参考裂纹尺寸下采样试件的所有裂纹形成时间(TTCI)值转换成EIFS值并组成一个数据总集,然后按三参数Weibull分布进行拟合即可得到通用的EIFS分布参数。
短句来源
    An evaluation approach is presented to the initial fatigue quality of fastener holes, which is characterized by Equivalent Initial Flaw Size Rating (EIFSR) obtained by back extrapolated fractographic data of constant amplitude loading.
    给出了一种由等幅载荷试验的断口金相数据反推得到的当量初始裂纹尺寸额定值(EIFSR)表征的紧固孔原始疲劳质量评定方法。
短句来源
    After a period of time, the fatique crack will appear in the tail structure of Boeing serials aircrafts. It is necessary to use Vortex Detection to inspect this kind of flaw.
    波音系列飞机飞行一定时间后,飞机尾部结构出现疲劳裂纹,需用涡流检测法进行损伤检查。
短句来源
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  fatigue crack
    STUDY ON MIXED-MODE FATIGUE CRACK PROPAGATION IN A STIFFENED SHEET
    复合加载下加劲板疲劳裂纹扩展研究
短句来源
    SHORT FATIGUE CRACK GROWTH AND PREDICTION OF ENGINEERING CRACK INITIATION LIFE
    疲劳短裂纹扩展与工程裂纹形成寿命预测
短句来源
    EFFECTS OF OVERLOADING AND OVERLOADING RATIO ON FATIGUE CRACK INITIATION LIFE OF LY12CZ ALLOY
    超载和超载比对LY_(12)CZ板材疲劳裂纹起始寿命的影响
短句来源
    RESEARCH OF FATIGUE CRACK INITIATION GROWTH THRESHOLD
    疲劳裂纹起始扩展门槛值的研究
短句来源
    A PREDICTION TO FATIGUE CRACK INITIATION LIFE OFLC4CS ALUMINIUM ALLOY SHEET AND OVERLOADING EFFECT
    LC4CS铝合金板材疲劳裂纹起始寿命及超载效应的估算
短句来源
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  “裂纹”译为未确定词的双语例句
    A 2-DIMENSIONAL FINITE ELEMENT STIFFENER MODEL FOR CRACKED SIFFENERS IN A STIFFENED PANEL STRUCTURE
    加筋板结构中含裂纹筋条的二维有限元模型研究
短句来源
    AN ELASTIC PLASTIC FINITE ELEMENT ANALYSIS OF CRACKED STIFFENED CURVED PANEL UNDER BIAXIAL STRESS
    双轴应力下含裂纹加筋曲板剩余强度的弹塑性有限元计算
短句来源
    THE CALCULATION OF STRESS INTENSITY FACTOR FOR CRACKED SECTION IN A STIFFENED STRUCTURE
    型材筋条含裂纹的加筋结构应力强度因子计算
短句来源
    THE RELIABILITY MODEL OF THE STRUCTURE WITH MULTI-CRACKS UNDER RANDOM LOADS
    随机谱载荷下含多裂纹结构的概率断裂力学可靠性模型
短句来源
    Equivalent Damage Model for Predicting FCG Life Under Random Spectrum Loading
    随机谱下疲劳裂纹扩展的等损伤模型
短句来源
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  flaw
The identification of the geometrical character of a flaw is then given by the two dimensional inverse Born approximation in a low-frequency range.
      
We analyzed spatial distribution of the main types of water bodies as well as the cascade structure formed by some biogeochemical barriers near the Ob-Yenisey flaw polynya.
      
A highly efficient technique of ultrasonic testing using "chord" transducers with elastic protective covers in combination with general-or special-purpose flaw indicators is suggested.
      
Solution of reciprocal problem of magnetic flaw detection through calculation of multipole moments of an elliptic flaw
      
An algorithm has been developed for calculating parameters of an effective elliptic flaw (EEF) on the base of changes in the magnetic field intensity in the air.
      
更多          
  fatigue crack
The variables recorded in the tests were the applied load, number of loading cycles, length of a fatigue crack, strain in sample material, and parameters of AE signals.
      
The dynamics of the frequency spectrum of the samples is investigated during the development of a fatigue crack.
      
Features of variation of the frequency spectrum of free vibrations in samples with fused coatings which are characterized by complex kinetics of the development of a fatigue crack are noted.
      
As SEs are broken, information is obtained simultaneously from acoustic-emission (AE) and tensometric equipment and measurements of the fatigue crack's opening are carried out.
      
These signals are processed using cluster analysis, which makes it possible to separate the signals emitted by a propagating fatigue crack in the stringer region from the signals arriving from the region of the fracturing gripping jaw.
      
更多          


In this study the sonic resonance technique was used to determine the Young's elastic moduli, the controlled surface microflow technique was used to measure the fracture toughness and the critical strain energy release rate was calculated.The Young's elastic moduli and fracture toughnesses of three different glassy carbons were measured from room temperature to 1023°K. The fracture, oxidized and machined surfaces were investigated and observed by scanning electon microscope. The critical strain energy release...

In this study the sonic resonance technique was used to determine the Young's elastic moduli, the controlled surface microflow technique was used to measure the fracture toughness and the critical strain energy release rate was calculated.The Young's elastic moduli and fracture toughnesses of three different glassy carbons were measured from room temperature to 1023°K. The fracture, oxidized and machined surfaces were investigated and observed by scanning electon microscope. The critical strain energy release rates of the galssy carbons were analyzed and compared with the polycrystalline griphites and carbon-carbon composites.

本文简要介绍用“声共振法”测材料的杨氏模量,用“控制裂纹法”测材料的断裂韧性以及材料的极限应变能释放率的计算。对三种玻璃碳的室温-1023°K的杨氏模量和断裂韧性进行了测定,用电子扫描显微镜对玻璃碳的断裂、氧化和加工表面进行研究观察,分析了玻璃碳的极限应变能释放率并与多晶石墨及碳-碳复合材料进行比较。

An elastic analysis of transient temperature field and stress field obtained from finite element method and its program are presented. In this calculation methcd the Weighted Residual Method is used to solve the axially symmerfc transient conduction differential equation directly, then the obtained differential expression is transformed to the formulation of finite element method.The 1st stage turbine disk of an existing engine is used as an example in this paper, its temperature field and stress field during...

An elastic analysis of transient temperature field and stress field obtained from finite element method and its program are presented. In this calculation methcd the Weighted Residual Method is used to solve the axially symmerfc transient conduction differential equation directly, then the obtained differential expression is transformed to the formulation of finite element method.The 1st stage turbine disk of an existing engine is used as an example in this paper, its temperature field and stress field during the various condit'ons of starting, accelerating, maximum, lower power for cooling and shutdown have been predicfed, from which we obtain the result that the position of maximum stress is different from the position of maximum stress amplitude. It is well known that the fatigue cracks always initiate at the position of maximum stress amplitude in the slot bottom.

本文提供了用有限元素法对瞬态及稳态温度场及应力场进行计算分析的方法及程序。用加权余数法直接对轴对称瞬态热传导方程求解,对空间域及时间域离散建立有限元表达式。 以现有某型发动机Ⅰ级涡轮盘为算例,计算了起动、慢车、最大、冷机和停车等各种工况下的温度场及应力场。由此得出应力最大部位与应力幅值最大的部位,而且两者并不在同一部位。而疲劳裂纹常常发生在槽底应力变化幅值最大的部位。

A local strain fatigue analysis method is presented for evaluation of fatigue life. First, the three parameter elements of load increment, strain increment and stress increment are constructed by using the cyclic stress-strain curve of the material and the cyclic load notched strain curve of notched specimens. Then, the local stress-strain analysis of notched specimens under complex load is made by means of these elements and "availability coefficient matrix"given by R. M. Wetzel. The damage of each cycle is...

A local strain fatigue analysis method is presented for evaluation of fatigue life. First, the three parameter elements of load increment, strain increment and stress increment are constructed by using the cyclic stress-strain curve of the material and the cyclic load notched strain curve of notched specimens. Then, the local stress-strain analysis of notched specimens under complex load is made by means of these elements and "availability coefficient matrix"given by R. M. Wetzel. The damage of each cycle is determined on the basis of local strain amplitude and correction for the effect of mean stress. Last, the damage can be cumulated according to Miner's linear cumulative damage theory and the life can be evaluated.The features of this method consist in adoption of three parameter elements of load increment, stress increment and strain increment; one-step transformation from loadtime histories to local stress and strain-time histories, then the computation procedure is simplified.The example of the Cumulative Fatigue Damage Division of the SAE Fatigue Design and Evaluation Committee has been computed with our program. The crack formation lives of the notched specimens for two materials under vehicle transmission load have been evaluated and the results are quite consistent with W. R. Brose's results and experiments. This demonstrates that the presented method and program are simple, reliable and rapid. This program can work more than 50 peaks per second and may be available for engineering evaluation of the crack formation life.

本文介绍了局部应变疲劳分析方法,及用这种方法计算工程裂纹形成寿命的程序(程序从略)。这种程序的特点是:采用载荷增量、应力增量、应变增量三参数单元,一次完成从载荷-时间历程向局部应力、应变-时间历程的转变;并在转变的过程中计算每一应力、应变循环造成的损伤,最后给出寿命。通过实例计算表明,这种程序简单可靠,计算迅速,可用于缺口构件工程裂纹形成寿命的估算。

 
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