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 Wysłany: Pią 11:38, 17 Gru 2010 Temat postu: ugg milano Non-destructive measurement of residual |
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Non-destructive measurement of residual stress development status Introduction
A V0cos (x +) (15) (15) reflects the sound source at the point of the contribution of electronic sound signal VΣ, VΣ vΣ can be expressed as a I () dx (16) - J0 where is the heat wave maximum penetration depth. 6 Looking destructive residual stress testing for scientific research and industrial production provides a fast and convenient, but research in this area is still very difficult. In the application of X-ray diffraction method of measuring residual stress in the following areas still require further study. (1) Taylor series expansion of the law or even three times to take to the quadratic term of the mathematical treatment. (2) Laplace method can use a single X-ray source,[link widoczny dla zalogowanych], according to the roll method to obtain depth information by changing the azimuth angle to calculate the stress distribution. (3) CT scanning for the determination of residual stress in the beryllium calculation model, experimental equipment and its low atomic number materials in the field of promotion, and whether the X-ray structure analysis of depth distribution of residual stress distribution of migrating to in the past. In the application of ultrasonic measurement of residual stress on the existence of the following three aspects. ① measurements tested large pieces of material interference with the organizational structure. ② The dramatic changes in the surface or internal stress components and complex shape by the three components to stress, measured by ultrasonic stress, many outstanding issues. ③ the acoustic wavelength is too long,[link widoczny dla zalogowanych], the use of interferometry is still difficult to solve, and this will also affect measurement accuracy. Scanning electron acoustic microscope metal materials can be caused by plastic deformation residual stress distribution were observed,[link widoczny dla zalogowanych], but the signal from the electronic sound generation to acceptance is a complex physical process, the residual stress distribution on the electronic mechanism and the role of acoustic signal The theoretical model is being further explored. References: [13 (days) rice Mao. Residual Stress and Strategy I-M]. Beijing: Mechanical Engineering Press, 1975. [2] set Quan Zhang, Jia-wen. Material x-ray diffraction residual stress analysis and the role of [M]. Xi'an: Xi'an Jiaotong University Press, 1994. [3] ERSITY Chen Huinan. Ring core A, B release factor FEM [J3. Mechanical strength, 1992,149 (4) :24-28. [43LeepRW, PasleyRLMethodandSystemforInves-tigatingtheStressConditioningofMagneticMaterials [P]. USLettersPatent: 3427872,1969. [53BarrettCS, MassalskiT13. StructureofMetals [M]. NewYork: McGraw-Hill, 1966. [6] AmericanStressTechnologies, Inc. AST/X2001 a G2X-RayStressAnalyzerUsera ~ I-Z]. Pitts-burgh: AsT, 2001. [7] HattingMASeminumericalMethodtODeterminetheDepthProfileoftheThereDimensionalResidualStressStatewithX-rayDiffraction ~ J]. ActaMater,[link widoczny dla zalogowanych], 1998,46 (4): 1427. (Continued from No. 594) is a typical form of quenching crack crack, crack growth in its central part is due to the stress caused by wire cutting stress cracking. Metal Machine Cutting through the electrode (molybdenum wire) and the high frequency spark discharge between the workpiece, so that the instantaneous surface of the metal to reach the local> IO00 ~ C above the temperature, and melting or gasification to be the working fluid with particles go, so as to achieve the purpose of cutting [1]. Because the characteristics of line cutting, cutting metal parts online often produce stress cracking process and surface defects such as organizational changes. This paper described the hardware gear shaft itself quenching (quenching crack was found alignment, without tempering), a large residual stress, in addition to the WEDM cutting stress generated in the process, in both common role of stress, which produce specimens of low-fold interlinked with the main crack the stress cracks. 3 Conclusion gear shaft longitudinal cracks caused by defects in the grounds of quenching cracks of raw materials, the center of the crack line in the anatomy of cutting stress cracks generated in the process. References: [1] HU Shi Yan, et al. Machinery Failure Analysis Handbook [M]. Chengdu: Sichuan Science and Technology Press, 1989.164.
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