The Study Of Dynamic Response Of Plates With Pre-formed Holes Subjected To Shock Wave Loading

As one of the basic structures frequently used in engineering applications,the research on anti-explosion design of plate structure has been widely concerned by scholars,and has obtained abundant research results.However,at present,the most of works focused on the intact plate structure,and the plate with holes structure is also widely used in practical engineering applications.In addition,the dynamic response of the plates with holes under air-blast loading can also be used as a decoupling method to investigate the synergetic effect of combined blast and fragment loading on plates.There are few researches about the blast resistance of plates with hloe by far,therefore numerical simulation and experimental studies were undertaken on the dynamic response of clamped aluminum plates with pre-formed holes subjected to shock wave load in this thesis.Firstly,an experimental study of shock wave loading on the plates with different preformed holes whose shapes include diamond,circle and square is presented,and shock wave loading was generated by shock tube.The 3D-DIC measurement system composed of two high-speed cameras was used to obtain the dynamic response process of the plates.The experimental results show that the final displacement field of plates with or without pre-formed holes is similar and both of them can be expressed in the form of trigonometric functions.Combined with the experimental results,the effects of hole shape and hole size on the ultimate bearing capacity and deformation resistance of the plates were analyzed.In order to further study the dynamic response of the plates with pre-formed,ABAQUS was used to simulate this experiment.The numerical simulation results in deflection,displacement field and failure process of the plates match well with the experimental results,which verifies the accuracy of the finite element model.The stress field and damage of the plates are analyzed.And the influence of the location and the size of the holes on the deflection was further investigated through numerical simulation,the mathematical expressions about combined effect of hole position and hole area on deflection of plates were obtained,which can be predicted deflection of plates under the air-blast loading by combining with the existing theories.