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.

Table 1: Chemical composition range (wt%) of the steels studied. The lower half of the table shows the variables actually included in the analysis.

Element	Range		Element	Range
Carbon	0.1-0.8		Copper	0-0.2
Chromium	0-5		Manganese	0-2
Molybdenum	0-2		Nickel	0-2
Silicon	0-2
Variable	Range		Variable	Range
Elongation / %	0.2 -61.8		0.2% Proof stress / MPa	122-1735
Tensile strength / MPa	270-2206		Specimen length / mm	13-260
Specimen thickness / mm	1.2-134		Pre-crack length / mm	1-52
Stress ratio	-1-1		Frequency / Hz	1-150
$\Delta K$ / MPam$^{1/2}$	2.5-142		$\frac{da}{dN}$ / mm cycle$^{-1}$	9.82$\times$10$^{-10}$-4.86$\times$10$^{-1}$

Table 2: The inputs for the predictions in Figs 5, 6, 7 covering nickel, titanium and aluminium alloys.

Variable	Figure number
	5a	5b	5c	5d	5e	5f	6a	6b	7a	7b
Elongation / %	5	15	20	20	27	33	14	8	20	14
0.2% Proof stress / MPa	1020	1172	1113	1113	1076	921	930	524	1172	940
Tensile strength / MPa	1520	1404	1373	1373	1441	1351	970	464	1440	998
Specimen length / mm	72.5	63.5	50.8	31.8	62.5	5	155	155	7	7
Specimen thickness / mm	12.5	25.4	12.7	8.89	25	3	40	40	7	7
Pre-crack length / mm	12.5	18.3	6.4	5.3	17.5	0.4	9	9	0.5	0.5
Stress ratio	0.1	0.1	0.05	0.05	0.5	0.5	-1	0.5	0.1	0.5
Frequency / Hz	40	20	0.667	0.667	20	100	20	20	0.25	100

Figure 1: Distribution of data used to create the model.

Figure 2: Performance of the committee of models on the entire dataset of 12807 experiments.

Figure 3: Perceived significance of the inputs in the committee model. Both the mean significance and the upper and lower limits from the members of the committee are shown.

Figure: Calculations for a bearing steel. The points represent experimental data from [32], whereas the uncertainty range illustrated is calculated.

Figure: Predictions represented by the uncertainty range, and experimental data presented as points, for nickel based superalloys. (a) Udimet 700, data from [33]. (b) Inconel 718 with data dues to [34]. (c,d) Inconel 718, data from [35]. (e) Waspaloy, data from [36]. (f) Waspaloy, data from [37].

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Figure: Calculations (uncertainty ranges) for titanium and aluminium alloys compared with measurements (points) due to [38,39].

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Figure 7: Blind predictions for Ti 6/4 forging material.

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