Crack growth resistance of MAG butt-welded joints of S355JR construction steel
作者： M. Benedetti , V. Fontanari , C. Santus
DOI: 10.1016/J.ENGFRACMECH.2013.01.019
关键词: Composite material 、 Welding 、 Tearing 、 Metallurgy 、 Residual stress 、 Materials science 、 Crack closure 、 Crack growth resistance curve 、 Paris' law 、 Fracture toughness 、 Heat-affected zone
摘要: Abstract Fatigue crack growth resistance and elastic–plastic fracture toughness were measured on MAG (Metal Active Gas) butt-welded joints made of S355JR construction steel. For this purpose, C(T) specimens extracted from virgin welded 15 mm thick rolled plates. Tests conducted the base material (BM), heat affected zone (HAZ) weld metal (WM). The analyses showed that compressive residual stresses due to welding increased fatigue WM HAZ owing closure effects. displayed lowest with respect BM. highest value was exhibited by because stable tearing extension is forced along an unfavourable path. Therefore, particular care must be taken in evaluating path order correctly estimate their advance.
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