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Yokobori; et a l , 1968,1969). Thus, f o r f i n a l f r a c t u r e of both t y p e s mentioned above, the creep fracture time t can be o b t a i n e d by i n t e g r a t i n g d a / d t e x p r e s s e d by e q . ( 3 ) i n t e r m s o f Q* f r o m a to a , the crack i n i t i a t i o n l i f e b e i n g a s s u m e d a s much s m a l l e r t h a n t h e c r a c k growth l i f e . a i s t h e i n i t i a l c r a c k l e n g t h and a i s the c r i t i c a l length o f t h e c r a c k w h i c h l e a d s t o t h e f i n a l f r a c t u r e when i t i s r e a c h e d .

I f s t r u c t u r a l and g r a i n boundary c o n t r o l of S i C can be s u c c e s s f u l l y performed, t h e p o s s i b i l i t y of high d u c t i l i t y i s expected f o r S * C I Yokobori, J r . et a t 1996d). s S s S CONSTITUTIVE EQUATION(MASTER CURVE) OF CREEP DEFORMATION AND FRACTURE B a s e d on t h e s i m i l a r i t y l a w o f c r e e p d e f o r m a t i o n a g a i n s t s t r e s s a p p l i e d time, the following c o n s t i t u t i v e equation ( c h a r a c t e r i s t i c function) is p r o p o s e d by Y o k o b o r i , J r .

7 ψ Ό Creep strain, „^ ? 25Cr-1Mo steel. (4) Calculation of residual life based on Omega method. 13 Nonaka and Kitagawa Relation between creep rate and strain in Modified 9Cr-1 Mo steel. 14 oiress, (wiraj Effect of stress and temperature on Omega values in Modified 9Cr-1Mo steel. Prediction of residual life based on Omega method in Modified 9Cr-1 Mo steel. 15 Evaluation procedure of residual life using Omega method. M. J. YANG Department of Civil ana Structural Engineering, UMIST, UK. 1 ABSTRACT Finite element analyses of two geometries of double Τ tubular joints under axial loading have been carried out for models in the uncracked condition and with three different crack sizes.

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