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Engineering · Mechanical Engineering
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The mechanical component shown in the figure is subjected to variable loading conditions that cause the axial stresses to fluctuate as indicated in the stress-time history. The material of the part is AISI 1045 HR steel with an ultimate static strength of 570 MPa. The part has been tested in the laboratory under different completely reversed stress amplitudes, the fatigue life results of these tests are shown in the table. Determine: a) The S-N diagram of the part based on the experimental data provided in the table. Use a linear regression to estimate the model constants. Set a logarithmic scale of the number of cycles and a linear scale for the fatigue strength. b) The number of repetition of the stress cycles shown in the stress-time history that the part is able to sustain before fatigue failure. Use Miners law to model the level of fatigue damage accumulated after one repetition. Whether the sequence of the applied stress cycles affect the fatigue life of the mechanical component. c) Stress (MPa) 280 cycles 100 cycles 550 cycles 350 cycles 530 440 340 240 time -240 one repetition Stress (MPa) N (Cycles) 524 459 410 352 315 270 250 257 1,494 749 19,090 36,930 321,500 1,000,000
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