1.Firstly, the parameters controlling ductile crack growth are gotten from the resistance curve result of standard 3 point bending specimen, then the resistance curves of the tensionspecimen for the welded joint with different strength mis-matching are predicted based on the cell model.
2.Using Compact tensionspecimen (CT), delayed hydride cracking (DHC) tests were imple-mented to determine cracking velocities in CANDU Zr-2.5Nb pressure tube and RBMK standard pressure tube under constant loading and different temperature and different hydrogen contents.
3.The distribution of effective stress and plastic zone is analysed for compact tension (CT) specimen in 3-D deformation state using ADINA (AUTOMATIC DYNAMICAL INCREMENTAL NOLINEAR ANALYSIS) finite element program.
4.This paper refers to the fracture magnetic field discovered in tension experi- ments of some metal specimen,explains some phenomena on the earth,and points out that the abnormal magnetic phenomena in Bermuda Triangle might be due to the fracture of the earth′s crust.
