CONCLUSIONS Crack orientation has an important bearing on fracture toughness. The J-integral values of Ti-alloy plate specimens taken along the L-T direction are much higher than those taken along the L-S direction. And the J values of rolled ring Ti-alloy are as follow: L R R L C R J J J - - - > > The welding process can result in a reduced toughness of Ti-alloy. The J-integral values of the welded joint and HAZ Figure 8: J vs a of rolled ring (C-R) Figure 9: J vs a of rolled ring (L-R) Figure 10: J vs a of rolled ring (R-L)
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