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Wysłany: Nie 0:16, 16 Sty 2011
Temat postu: Crankshaft Fracture Analysis of three-dimensional
Crankshaft Fracture Analysis of three-dimensional photoelastic
Threshold values were 300N/mm. And 5.87MPam4 fatigue life estimation and testing cycle to take the ship buildings crankshaft inspection cycle (ie, vessel inspection cycle) ‰ for the life of the I / 2, the inspection cycle T = r, 2. Taking into account the photoelastic model material and the value of ductile Chiang Iron worry about the quality Results arrest of steel different,
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, selenium amended,
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, respectively, equation (6) and (7) for numerical integration,
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, corresponding to different crack size pox labor life and inspection cycle are listed in Table 3 and Table 4. In which the data listed in Table 4 are somewhat conservative, which is given to 8NVD48A-2U type j crankshaft system of foreign products are not sufficiently aware of its production process; if domestic imitation, its composition,
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, performance and a great difference; to consider shipping absolute safety of navigation, cross a certain safety margin to increase. Table 36160A crankshaft fatigue life and test the periodic table 48NVD48A-2U crankshaft Sheng Lo and test life cycle of crack size (mm) 0500550600650.700800901.0C Ⅳ 0, hlOlf ~ 604163718499879544291294439168h508302081892494397221464721984 Table 3 and Table 4 data show that the fatigue life of the crankshaft with a crack With the increase of crack size decreased rapidly, but still have enough carrying capacity limits as long as the strict control of the inspection cycle of surface crack at a certain depth range, the crankshaft is normal use. Thus changing the requirements of the traditional theory of fatigue strength and crack-free surface, the concept of the crankshaft,
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, update and enrich the existing ship construction and testing specification 5 Conclusion D6160A crankshaft axis faults in the structural design of the station management did not, so borrowing norms as a river with ships, defect in the design of the crankshaft; by plane and solving the combination of three-dimensional photo-elastic stress intensity factor of cracked crankshaft and its form factor is both accurate and economical and easy way; crankshaft crack growth should be based on characteristic parameters of crack propagation area was more reasonable, knock on the Paris formula should be properly amended.
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