Abstract
The influence of body thickness on the resistance to failure at tensile loading on yield, ultimate tensile strength and transition temperature, comparison of test results obtained by using small test specimens with those obtained on large test specimens, respectively. Influence of the thickness on the crack-arrest temperature as well as on the ductile-brittle transition temperature assessed by DT tests. The size effect on the fracture toughness in the transition region as well as in the ductile tearing region of the material, on the R-curves, respectively. The influence of the notched test specimens thickness as well as of welded components on the fatigue strength. Dependences of fatigue crack-growth rates on the amplitude of stress intensity factors for different sizes of CT specimens. Application of knowledge in the field of thickness effects on the limiting conditions of failuring in design codes for welded structures.

Key words
fracture toughness, steels, R-curves, thickness effects

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