A4T - Politecnico di Milano

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Summary of A1N tests Dipartimento di meccanica 8
Summary of A4T tests • End life tests obtain the SN diagram of this material and to compare it with the SN diagram of the A1N steel. (11 tests ) • Tests interrupted at a fixed percentage of the fatigue life (and not restarted), to study, as for A1N, the evolution of corrosion pits, the pit-to-crack transition and the coalescence of cracks at different stages and for different stress levels (15 tests) • Tests at low and high stress level, interrupted and restarted each 2÷6 10 5 cycles for the measurements of crack growth rate (7 tests) For A4T material the scheduled tests and additional have been completed. Dipartimento di meccanica 9
Page 1 and 2: Wolaxim final meeting 24 th -25 th
Page 3 and 4: Wolaxim experimental plan and aims
Page 5 and 6: Materials 5 30CrMb Bainitic microst
Page 7: Summary of A1N tests • End life t
Page 11 and 12: Tests on 30CrMb material For 30CrMb
Page 13 and 14: Observations • Atmospheric corros
Page 15 and 16: Corrosion fatigue process 15 Dipart
Page 17 and 18: First stage of the Fatigue Life 180
Page 19 and 20: Damage of the surface 19 • Chemic
Page 21 and 22: Probability 0.99 0.96 0.90 0.75 0.5
Page 23 and 24: Probability 0.99 0.96 0.90 0.75 0.5
Page 25 and 26: Crack propagation tests Microdrille
Page 27 and 28: Interrupted test and crack propagat
Page 29 and 30: Crack growth rate A4T 320 MPa Confr
Page 31 and 32: Propagation of single cracks A4T 40
Page 33 and 34: Interrupted test and crack propagat
Page 35 and 36: Prove Full-Scale
Page 37 and 38: Full scale test A4T = 360 MPa Stop
Page 39 and 40: Plastic replica 1e6 cicli 0° Dipar
Page 41 and 42: Plastic replica 2.2e6 cicli 0° Dip
Page 43 and 44: Mechanical cleaning- 4.317e6 cycles
Page 45 and 46: Full scale test A4T = 240 MPa Stop
Page 47 and 48: Plastic replica 2e6 cycles Dipartim
Page 49 and 50: TWI Digital Microscope - 2e6 cycles
Page 51 and 52: TWI Digital Microscope - 2e6 cycles
Page 53 and 54: Assile 038 - Replica 6e6 cicli Dipa
Page 55: Conclusion • Agreement between cr

A4T - Politecnico di Milano

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