A fundamental theory for the analysis of residual welding stresses and deformation based on the inherent strain distribution along the welded joint is introduced. Distribution of inherent strains and longitudinal resi...A fundamental theory for the analysis of residual welding stresses and deformation based on the inherent strain distribution along the welded joint is introduced. Distribution of inherent strains and longitudinal residual stresses in medium thickness plate weldment is calculated and analyzed. A new method of calculating inherent strains and longitudinal residual stresses is proposed.展开更多
Europa,the second Galilean satellite outward from Jupiter,has an outer layer of water of about 100 km thick and an outmost ice shell. The thickness of the ice shell is very important in understanding Europa’s habitab...Europa,the second Galilean satellite outward from Jupiter,has an outer layer of water of about 100 km thick and an outmost ice shell. The thickness of the ice shell is very important in understanding Europa’s habitability and thermal history,but estimates from different studies are very inconsistent,ranging from 0.2 to 30 km. Here we obtain an estimate of the ice shell thickness from locations of flanking crack and forebulge along Ridge R. Considering the water’s heating process to nearby ice shell in the crack,a flexure model is applied and it suggests the thickness of an ice shell to be 500―1500 m without a convective layer. Compared with previous studies using the same method but ignoring the water’s heating process,the rationality and accuracy have been improved dramatically in our results. We also get some constraints on the strain rate ε and the characteristic temperature Tc,which defines the base of the elastic layer.展开更多
文摘A fundamental theory for the analysis of residual welding stresses and deformation based on the inherent strain distribution along the welded joint is introduced. Distribution of inherent strains and longitudinal residual stresses in medium thickness plate weldment is calculated and analyzed. A new method of calculating inherent strains and longitudinal residual stresses is proposed.
基金This work was supported by the National Natural Science Foundation of China (Grant No.NSFC40474063).
文摘Europa,the second Galilean satellite outward from Jupiter,has an outer layer of water of about 100 km thick and an outmost ice shell. The thickness of the ice shell is very important in understanding Europa’s habitability and thermal history,but estimates from different studies are very inconsistent,ranging from 0.2 to 30 km. Here we obtain an estimate of the ice shell thickness from locations of flanking crack and forebulge along Ridge R. Considering the water’s heating process to nearby ice shell in the crack,a flexure model is applied and it suggests the thickness of an ice shell to be 500―1500 m without a convective layer. Compared with previous studies using the same method but ignoring the water’s heating process,the rationality and accuracy have been improved dramatically in our results. We also get some constraints on the strain rate ε and the characteristic temperature Tc,which defines the base of the elastic layer.
