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FD2815X type agricultural vehicle steering arm fracture analysis

Rough area, shown in Figure 2. The figure shows, the flat area was symmetrical along the diagonal, the diagonal is very small rough areas, this area is the final fracture zone. Fracture sources were located symmetrically on both sides of the shaft position can be seen in the split level source. Figure 3 shows the fracture morphology near the source of the low magnification, showing conchoidal stripes, which can be initially determined the fracture bending fatigue fracture diagram for the steering knuckle arm 2 2.2 metallographic examination of macro fracture surface obtained in the fracture near the vertical and horizontal Specimen cross-section of the piece. Optical microscope, the heart of the Department is tempered sorbite + feather and semi-meshed ferrite; the surface microstructure is tempered sorbite + blocks, slabs distribution of ferrite body, some organizations ferrite surface as shown in Figure 4. Shows that the apparent surface of steering knuckle arm and half of decarburization decarburization layer. The GB224-87 \Shows that their chemical composition compliance. Section 3 the test results analysis to withstand repeated bending at work, alternating the role of stress and torsional stress, it requires not only material to have sufficient bending strength,[link widoczny dla zalogowanych], fatigue strength and good toughness, and the component surface decarburization was not allowed to exist layer, scratches and folding defects. According to failure than the smooth and the final pieces of the fracture fracture fracture surface area is small and located in the central section can be used to determine the steering load suffered small, two-way symmetrical bending load from the macro in Figure 3 can be determined Knuckle stripes conchoidal arm bending fatigue fracture fault system. Source areas were split on both sides of the axis relative to said position, by the schism at the source level can be determined to be multiple sources of fatigue. Optical microstructure of the test results show that the failure of the whole surface of steering knuckle arm and half decarburization layer delamination, non-normal tissues, total decarburization depth of about 0.35mm, the surface hardness of 153HV, according to the hardness strength conversion formula one , failure knuckle surface (full decarbonization layer) is about 553.5N/mm. , And quenched 40Cr normal tissue Gong up 900N/mm, which makes the steering knuckle surface fatigue strength declined significantly. The steering arm on the broken parts of the structure of the smallest cross-section area, while working there when the big moment, thus the maximum torque per unit area. Due to the alternating component cut by bending load, the part surface stress maximum surface roughness combined with steering arm, there are more pits, in the course of the crack along the component surface decarburization of the first zone and pit initiation at the weak parts crack, as the continue to bear the alternating stress, the crack gradually extended to the rest of the section, until the effective cross-sectional area was reduced to no longer bear the applied total stress, the component fracture. 4 Conclusion steering knuckle arm the presence of surface decarburization layer, together with its rough surface, with pits and other defects in the material surface fatigue strength decrease. In turn by the alternating stress,[link widoczny dla zalogowanych], the cracks initiate at the surface of the part the first weak point, with the alternating stress continue to bear the fatigue crack was extended, leading to fatigue failure. References 1 minute group Peng, Tian Yongjiang. Failure Analysis Basics. Beijing Machinery Industry Press, 199o. 32 Received date; 1999,[link widoczny dla zalogowanych], a Ol a 29 \basic formula and its verification, the image is not clarity-ray inspection,[link widoczny dla zalogowanych], as the quality of both its role in radiation detection, radiation detection standard design, the exposure curve and its proper function, performance and selection of photographic film, the crack can be tested nature, diffraction markings, defects in radiographic detection of quantitative, real-time imaging ray weld inspection, tomography and CT technology, computer applications in radiation detection, computer-aided design system specifications ray inspection technology and the reliability of non-destructive testing other 15 topics. The book by the Tu Yao-yuan, Zheng Shi-cai, LI Yan-three experts book, \The book is a ray of inspectors required for re-examination and updating of knowledge NDT professional books and university teaching and learning of the reference materials may be used as quality control personnel, inspection personnel and designers to learn the knowledge of the reference ray inspection. Pricing 2O. oO yuan / register (registration required 1O mail order plus postage). Please subscribe to one unit and one full address, department, zip code, contact person and number of copies required to send money and books,[link widoczny dla zalogowanych], 99 Handan Road, Shanghai Science and Technology Information on the Haike Hai Development Company (within the Shanghai Institute of Materials), Zip code 200437, telephone : (021) 65420775x31l. Bank: ICBC Shanghai Hongkou Great Park Sub Account :022320 -14,409,106

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