Application of 𝑇₃₃-Stress to Predict the Lower Bound Fracture Toughness for Increasing the Test Specimen Thickness in the Transition Temperature Region

Table 2

Fracture toughness test and FEA results for A533B compiled from the Shoreham reactor pressure vessel data [1] (3PB, 𝑊=50.8 mm, −91°C; 𝜇: average, Σ: standard deviation).

𝐵 mm (𝐵/𝑊)	Serial number	1	2	3	4	5	6	𝜇	Σ	2Σ/𝜇 %
8 (0.157)	𝑎/𝑊^∗	0.48	0.49	0.48	0.49	0.49	0.48	0.49	0.0	2.3
	𝑃𝑐 kN*	17.4	15.5	16.8	19.4	15.2	17.7	17.0	1.5	18.1
	𝐾𝑐 MPa m^1/2	96.6	88.7	93.2	110.8	86.8	98.0	95.7	8.6	17.9
	𝐾𝐽𝑐 MPa m^1/2∗	122	101	112	205	94	123	126.2	40.3	63.8
	𝐽𝑐 N/mm	65.6	44.9	55.3	185.1	38.9	66.7	76.1	54.5	143.4
	𝑇33𝑐 MPa	−327.7	−300.5	−316.0	−375.3	−294.2	−332.3	−324.3	29.0	−17.9
15.9 (0.313)	𝑎/𝑊^∗	0.49	0.49	0.49	0.49	0.49	0.49	0.49	0.0	0.0
	𝑃𝑐 kN*	36.7	30.5	35.9	34.9	23.3	35.9	32.9	5.2	31.6
	𝐾𝑐 MPa m^1/2	105.8	88.0	103.4	100.5	67.1	103.4	94.7	14.9	31.6
	𝐾𝐽𝑐 MPa m^1/2∗	129	93	122	121	69	122	109.3	23.4	42.8
	𝐽𝑐 N/mm	73.3	38.1	65.6	64.5	21.0	65.6	54.7	20.5	74.8
	𝑇33𝑐 MPa	−225.4	−187.4	−220.3	−214.1	−142.9	−220.2	−201.7	31.8	−31.6
31.8 (0.63)	𝑎/𝑊^∗	0.5	0.5	0.5	0.5	—	—	0.50	0.0	0.0
	𝑃𝑐 kN*	62.7	56.5	60.6	43.6			55.9	8.5	30.6
	𝐾𝑐 MPa m^1/2	93.2	83.9	90.0	64.9			83.0	12.7	30.6
	𝐾𝐽𝑐 MPa m^1/2∗	99	88	96	66			87.3	14.9	34.2
	𝐽𝑐 N/mm	43.2	34.1	40.6	19.2			34.3	10.8	62.7
	𝑇33𝑐 MPa	−98.4	−88.6	−95.1	−68.5			−87.7	13.4	−30.6
63.5 (1.25)	𝑎/𝑊^∗	0.51	0.52	0.52	0.51	0.52	—	0.52	0.0	2.1
	𝑃𝑐 kN*	119.0	77.3	107.1	96.4	84.6		96.9	16.8	34.7
	𝐾𝑐 MPa m^1/2	91.5	61.4	85.0	74.0	67.1		75.8	12.4	32.7
	𝐾𝐽𝑐 MPa m^1/2∗	99	62	86	76	70		78.6	14.4	36.6
	𝐽𝑐 N/mm	43.2	16.9	32.6	25.4	21.6		27.9	10.3	73.5
	𝑇33𝑐 MPa	−13.2	−7.2	−10.0	−10.7	−7.9		−9.8	2.4	−48.8

∗Published results in [1].