Experimental data with different specimen sizes for single notch bending test

Hello, everyone! 

The size effect in fracture is an important topic in fracture toughness. However, when we measure the fracture toughness of ductile materials, the standard specimens in ASTM E399 are usually adopted. I find there are few experimental data with different specimen sizes available for single notch bending test, so dose somebody provide some clues or hints for this kinds of experimental results? Thank you very much!