ed hardy clothing Practical fatigue crack prefabri

Practical fatigue crack prefabricated unit

Test method Is]. (Continued on 367) Huey-Er Lee, etc.: the surface structure of the metallurgical test samples of mosaic technique again good quality films (see Figure 1). Finally,[link widoczny dla zalogowanych], when the cut off point further, steel columns and the gap between the sample surface,> O. 5mm or so, the quality of the film once again deteriorated. Figure 1 mounted slightly off center of the material to fill the gap and 400 × in Figure 2 the sample surface and the gap between the steel columns on the results of 400 × by the knowledge, ① the brittle surface oxide film, when the steel columns and the sample surface of gap, and the inlaid materials can not squeeze into the case, the brittleness of coarse sand on the surface of the impact of a strong film, the film broken prone to the phenomenon of collapse, showing the edge of the wave shape. ② When the steel columns and the sample surface of the gap is too large (> O.5mm),[link widoczny dla zalogowanych], the steel columns supporting role was greatly weakened, while the inlay material and too soft compared to the protected object, can not protect the fragile surface of tissue samples . ③ When the steel columns and the sample surface, rely on tight, or the existence of a suitable gap (O.1 ~ 0.5ram) mosaic materials to be crowded, the sample surface brittle organizations can be well protected. 2 Conclusion (1) of the material surface for metallographic examination, although with the hardness of the material selected and the hardness of the object to be protected there is a big difference, but the actual effect is very good. (2) The shape of the sample surface with protective material, in certain conditions, complex cases, particularly in the sample surface is not very smooth, or due to some reasons the sample surface and with a certain gap between materials Mosaic materials will not result in the protection of materials into the sample between the microstructure of the surface is detrimental to a good show. At this point, regardless of the surface is flat to be detected, or curved, with the use of cylindrical protective material can try a convenient and effective means. References: [1] Shen Guiqin. Optical microscopy techniques [M]. Beijing: Beihang University Press, 1992. [2] Yao Hung years. Metallographic methods [M]. Beijing: China Industry Press, 1963. F-3] Li Xueqian. Simple and practical Specimen Mosaic F-J]. TESTING A physical volumes, 1991,[link widoczny dla zalogowanych],27 (4): 61. (Continued from No. 365) [4] Zhang Wanjing. Domestic and international electro-hydraulic servo testing machine [J]. Material testing machine,[link widoczny dla zalogowanych], [1o] 1977,12 (5,6) :1-132. [5] JohnRN. TheACommitteeonFatigueCrackPro a [11] pogation. FatigueCrackPropagation [A]. JohnRNewbyMetalHandbook [C]. Ohio: AmericanSociety [122forMetals1985 ,391-404. [6] Shanghai Research Institute of Materials Mechanics Group three rooms. Fatigue testing machine r-J]. Physical examination [13] testing a physical volumes, '1978, 14 (6) :45 - 52. [7] Long Yu-qiu, including the United World Chinese Commercial. Structural Mechanics [M]. Beijing: Higher Education Press, 1988.241. E8] Su Yilin. Mechanics of Materials [M]. Beijing: Higher Education Press, 1987. [14] 148-149. [9] Wang Hongshan. Fracture test methods and practical meaning and content of r-J]. TESTING A physical volumes, 1999,35 (5,6) :215-218 ,260-262. Wang Hongshan. With the direct determination of lateral bending specimen test methods KIC ductile materials [J]. Mechanical Strength, 1991,13 (1) :73-76. Wang Hongshan. Lateral sample feasibility r-J]. Experimental Mechanics, 1991,6 (3) :303-309. Wang Hongshan. The lateral bending specimens measuring two displacement method J-j]. Experimental Mechanics, 1993,8 (1): 53 ~ 56. WANGHongShan. PrincipleandMethodforDeter-miningFractureToughnessofStructuralSteelbySide-CutSE (B) lJ]. EngineeringEractureMechanics,[link widoczny dla zalogowanych], 1994,48 (6) :885-890. Wang Hongshan. Ideal plane strain specimens with direct determination method of ductile material KIc lJ]. Liaoning Technical University, 1989,8 (1) :35-42.

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