Analysis Of Deformation And Failure Of Clamped Square Plates Under Near-field Explosion Load

The deformation and damage mechanism of plate and shell structures under blast loadingof near-field have been significant and difficult points in the field of theoretical study, as theresearch results can provide reliable theoretical basis to anti-explosion design of plate andshell structures. In this paper, plastic distribution range and crevasse size of clamped squaresteel plates are studied on the basis of plastic hinge theory and energy theory, and theconclusions can be used as reference for anti-explosion design of plate and shell structures.The main contents are as follows:1. Through the analysis of explosive detonation process, the law of interaction betweennear-field explosion shock wave and structure was determined and the determination ofnear-field blast loading method was also given.2. Under moderate load condition, plastic range was obtained by assumptions andcrevasse size formulas of motion mode I and II were given according to the criterion that theplate was damaged when plastic strain of one point on the plastic hinge line was greater thanultimate strain. Under high load condition, plastic range was determined by the derivation ofplastic hinge line movement law. The crevasse size formulas of motion mode III and IV weregiven basing on all the kinetic energy of each chapped petal transformed to its bending energywhen the blast load ended.3. The process of deformation and damage of clamped square plates under blast loadingof near-field was analyzed by numerical simulation method. The fluid-solid coupled methodwas used and the critical strain of steel plate material was defined. So the following results aregot: equivalent stress and plastic range of steel plate, equivalent plastic strain and crevassesize of steel plate and displacement deformation of steel plate at each direction.4. Literature experimental results, the numerical simulation results and the theoreticalcalculation results of this paper were analyzed comparatively and all results were in goodagreement, which verified the rationality and limitation of the theoretical analysis in thispaper.