The elasto-plastic dynamic buckling and postbuckling phenomena of square plates subjected to in-plane solid-fluid slamming are investigated. According to the plate's response, the critical criteria for dynamic buc...The elasto-plastic dynamic buckling and postbuckling phenomena of square plates subjected to in-plane solid-fluid slamming are investigated. According to the plate's response, the critical criteria for dynamic buckling, dynamic plasticity and plastic collapse are defined, and the corresponding critical impulses are presented. Meanwhile, dynamic buckling modes and collapse models are observed. The effects of different boundary conditions and loading histories on the properties of buckling and postbuckling are discussed.展开更多
Elapsed time of serrations in AI-Li single crystals was investigated with two definitions: one is the time elapsed in one cycle of serrations, the other is the average elapsed time within a strain limit. Elapsed time ...Elapsed time of serrations in AI-Li single crystals was investigated with two definitions: one is the time elapsed in one cycle of serrations, the other is the average elapsed time within a strain limit. Elapsed time of individual serration appears independent on stress drops during serrated flow. It primarily distributes within the limits of short elapsed time in peak aged condition compared with underaged and overaged conditions, corresponding to low level of the average elapsed time that appears indifferent to increasing strain. It seems that shearing behaviour of delta' particles could be responsible for the variations in elapsed time of serrations.展开更多
IN the southern Yellow Sea there exists a large radial sand ridge system,which covers about20 000 km^2.Sand ridges and troughs occur alternately within the system,and single sandridges are tens of kilometers,even more...IN the southern Yellow Sea there exists a large radial sand ridge system,which covers about20 000 km^2.Sand ridges and troughs occur alternately within the system,and single sandridges are tens of kilometers,even more than one hundred kilometers long and ten to fifteenkilometers wide.Due to the distribution pattern of the radial sand ridge system being like展开更多
基金The project is supported by National Natural Science Foundation of China.
文摘The elasto-plastic dynamic buckling and postbuckling phenomena of square plates subjected to in-plane solid-fluid slamming are investigated. According to the plate's response, the critical criteria for dynamic buckling, dynamic plasticity and plastic collapse are defined, and the corresponding critical impulses are presented. Meanwhile, dynamic buckling modes and collapse models are observed. The effects of different boundary conditions and loading histories on the properties of buckling and postbuckling are discussed.
文摘Elapsed time of serrations in AI-Li single crystals was investigated with two definitions: one is the time elapsed in one cycle of serrations, the other is the average elapsed time within a strain limit. Elapsed time of individual serration appears independent on stress drops during serrated flow. It primarily distributes within the limits of short elapsed time in peak aged condition compared with underaged and overaged conditions, corresponding to low level of the average elapsed time that appears indifferent to increasing strain. It seems that shearing behaviour of delta' particles could be responsible for the variations in elapsed time of serrations.
文摘IN the southern Yellow Sea there exists a large radial sand ridge system,which covers about20 000 km^2.Sand ridges and troughs occur alternately within the system,and single sandridges are tens of kilometers,even more than one hundred kilometers long and ten to fifteenkilometers wide.Due to the distribution pattern of the radial sand ridge system being like
