Fatigue crack propagation rates and threshold stress intensity factor ranges for aluminium alloy plate, extruded bar and forgings.
Abstract:Constant amplitude fatigue crack propagation rate (da/dN) data are provided for several aluminium alloys commonly used in the aerospace industry, in the form of plate, extruded bar and forgings. The data have been derived from tests conducted in laboratory air at room temperature and mean da/dN curves are presented in terms of the stress intensity factor range and the stress ratio. Where possible curves representing the upper limit of 95 per cent of the data are also provided. Values for the coefficient and exponent in the Paris equation are tabulated for ranges of crack growth rate and fixed stress ratio. The ranges of da/dN covered are from 1E-3 m/cycle (3.9E-2 in/cycle) down to the fatigue threshold stress intensity factor range, at 1E-11 m/cycle (3.9E-10 in/cycle) . The effects of variations in the stress ratio, test piece thickness, grain flow and environment are discussed. Details of all the alloys and types of test pieces are tabulated and summary da/dN curves that compare the performance of the different alloys are given. Curves showing the effect of variations in the value of stress ratio at threshold for the various alloys are also presented. A simple worked example illustrates how the data may be used in practice.
|Data Item ESDU 81031|
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|Figure 1||BS L 64/L 102 extruded bar Al-Cu alloy|
|Figure 2||2024-T852 forging and 2124-T851 plate Al-Cu alloy|
|Figure 3||DTD 5090/BS L 97, 2024-T3 and T351 plate Al-Cu alloy|
|Figure 3a||DTD 5090/BS L 97, 2024-T3 and T351 plate Al-Cu alloy|
|Figure 4||DTD 5020/BS 2L 93 plate and 2014-T652 forging Al-Cu alloy|
|Figure 4a||BS 2L 93 plate Al-Cu alloy|
|Figure 5||RR58/2618-T651 plate Al-Cu alloy|
|Figure 5a||RR58/2618-T651 plate Al-Cu alloy|
|Figure 6||2219-T87 and T851 plate Al-Cu alloy|
|Figure 6a||2219-T87 and T851 plate Al-Cu alloy|
|Figure 7||7075-T6 and T651 plate and T6510 extrusion Al-Zn alloy|
|Figure 7a||7075-T651 plate Al-Zn alloy|
|Figure 8||7075-T7351 plate, T73510 extrusion and T7352 forging Al-Zn alloy|
|Figure 8a||7075-T7351 plate Al-Zn alloy|
|Figure 9||7175-T736 forging Al-Zn alloy|
|Figure 10||7175-T651 plate Al-Zn alloy|
|Figure 11||7475-T7351/T651 plate Al-Zn alloy|
|Figure 12||DTD 5050/BS L 95 plate Al-Zn alloy|
|Figure 13||DTD 5120 (7010-T7651) and 7010-T73651 plate Al-Zn alloy|
|Figure 14||7050-T73651 plate and 7050-T73511 extruded bar Al-Zn alloy|
|Figure 15||7049-T73511 extruded bar Al-Zn alloy|
|Figure 16||7079-T6 and T651 plate T652 forging Al-Zn alloy|
|Figure 17||7178-T6 and T651 plate and T6510 extruded bar Al-Zn alloy|
|Figure 18||5083-0 plate Al-Mg alloy|
|Figure 19||6061-T6 plate Al-Mg-Si alloy|
|Figure 20||Summary curves, R = 0 to 0.11, plate|
|Figure 21||Summary curves, R = 0.5, plate|
|Figure 21a||Summary curves for plate materials da/dN ≤10-7 m/cycle for two ranges of R|
|Figure 22||Summary curves, R = 0.5, plate|