ESDU 81031

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.

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Details:

Data Item ESDU 81031
Format:	PDF with interactive graphs
Status:	Amendment (B), 04 Apr 1998 Published in Release 2000-03 (init)
Previous Releases:	None available
ISBN:	978 0 85679 366 0

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This Data Item contains 29 interactive graph(s) as listed below.

Graph	Title
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