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

Table 4

Normalized 𝑇₃₃-stress solutions (𝛽₃₃) at the specimen midplane for 3PB specimens (𝜈=0.29).

𝑊=25.4 mm			𝑊=50.8 mm
𝐵/𝑊	𝑎/𝑊	𝛽33	𝐵/𝑊	𝑎/𝑊	𝛽33
0.315	0.49	−0.582	0.157	0.48	−0.938
	0.50	−0.583		0.49	−0.947
0.63	0.52	−0.281	0.313	0.49	−0.596
1.25	0.52	−0.032	0.63	0.50	−0.298
	0.53	−0.025
2.5	0.49	0.031	1.25	0.51	−0.041
	0.50	0.037		0.52	−0.034