The Finite Element Method of Lines （FEMOL） is a semi-analytic approach and takes a position between FEM and analytic methods. First, FEMOL in Fracture Mechanics is presented in detail. Then, the method is applied to...The Finite Element Method of Lines （FEMOL） is a semi-analytic approach and takes a position between FEM and analytic methods. First, FEMOL in Fracture Mechanics is presented in detail. Then, the method is applied to a set of examples such as edge-crack plate, the central-crack plate, the plate with cracks emanating from a hole under tensile or under combination loads of tensile and bending. Their dimensionless stress distribution, the stress intensify factor （SIF） and crack opening displacement （COD） are obtained, and comparison with known solutions by other methods are reported. It is found that a good accuracy is achieved by FEMOL. The method is successfully modified to remarkably increase the accuracy and reduce convergence difficulties. So it is a very useful and new tool in studying fracture mechanics problems.展开更多
In this paper. the research activities in the field cast iron welding in China in China in last decade are introduced. Investigations related to hot cracking and cold cracking of cast iron welding are reviewed Develop...In this paper. the research activities in the field cast iron welding in China in China in last decade are introduced. Investigations related to hot cracking and cold cracking of cast iron welding are reviewed Development of new consumables for welding ductile iron.compacted graphite iron and austempered ductile iron are also described.展开更多
Inl this investigation the different tests were carried out on the butt joints of several kinds of steels to study the effects of weldmatching on the fracture initiation under statie and dynamic loading, on the fractu...Inl this investigation the different tests were carried out on the butt joints of several kinds of steels to study the effects of weldmatching on the fracture initiation under statie and dynamic loading, on the fracture propagating arresting properties, on the fatigue behavior and finally on the residual stress distribution, The testing results show that overmatching of metal increases the possibility of having a general yieleding and may help to enlarge the tolerate of weld defects for crack initiation under dynamic or static loading. In the propagating and arresting cases the beneficial effct of overmatching of weld metal was found .However non significant effect of the weldmatch mg on the propagation thresholds △Kth and da'dN was found.展开更多
文摘The Finite Element Method of Lines （FEMOL） is a semi-analytic approach and takes a position between FEM and analytic methods. First, FEMOL in Fracture Mechanics is presented in detail. Then, the method is applied to a set of examples such as edge-crack plate, the central-crack plate, the plate with cracks emanating from a hole under tensile or under combination loads of tensile and bending. Their dimensionless stress distribution, the stress intensify factor （SIF） and crack opening displacement （COD） are obtained, and comparison with known solutions by other methods are reported. It is found that a good accuracy is achieved by FEMOL. The method is successfully modified to remarkably increase the accuracy and reduce convergence difficulties. So it is a very useful and new tool in studying fracture mechanics problems.
文摘In this paper. the research activities in the field cast iron welding in China in China in last decade are introduced. Investigations related to hot cracking and cold cracking of cast iron welding are reviewed Development of new consumables for welding ductile iron.compacted graphite iron and austempered ductile iron are also described.
文摘Inl this investigation the different tests were carried out on the butt joints of several kinds of steels to study the effects of weldmatching on the fracture initiation under statie and dynamic loading, on the fracture propagating arresting properties, on the fatigue behavior and finally on the residual stress distribution, The testing results show that overmatching of metal increases the possibility of having a general yieleding and may help to enlarge the tolerate of weld defects for crack initiation under dynamic or static loading. In the propagating and arresting cases the beneficial effct of overmatching of weld metal was found .However non significant effect of the weldmatch mg on the propagation thresholds △Kth and da'dN was found.
