Application Of Coupling Method Between Finite Element Method And Smoothed Particle Hydrodynamics In Explosion Problems

General materia l destructio n and large deformation proble ms exist wide ly in thepractica l application o f engineering, suc h as high-speed impact, explos ion and otherproble ms. It is important value for the practica l applicatio n of engineering to studythe numerical methods so lving the proble m of the large deformation and strongimpact proble ms. Finite Ele me nt Method (FEM) has good calculatio n accuracy andeffic ie ncy for small deformation proble ms, but its accuracy and efficie ncy decreasesignifica ntly due to the ele me nt distortion whe n it is used for problems invo lvinglarge deformations and material fracture. Smoothed Partic le Hydrodyna mics (SPH)has strong ability in mode ling large deformatio ns and is easy to simulate materia lfragme ntation and splas h, but its calculatio n effic iency a nd ability in treatingboundary conditio ns is not as good as FEM. Coup ling FEM and SPH can make use ofthe advantages of the two methods and provides an effective approach for thesimulation o f large deformation proble ms. The large deformation regio ns are solvedwith SPH, and the other regio ns are solved with FEM. By doing so, not only canele ment d istortio n be avo ided, but also good effic iency can be obtained. Meanwhile,the applied research based on the coup ling method is stud ied gradua lly forresearchers.Firstly, this paper introduces the details o f axisymmetric finite ele ment method,smoothed particle hydrodyna mics and the coupling method. Meanwhile, theunderwater explos ion near a ir-water surface was simulated us ing the coupling method,and it could be proved that the coup ling method had a good accuracy and image insimulating water column.Secondly, it had good accuracy for solving the blasting in concrete using thecoup ling method, and it can effective ly calc ulate the phys ica l qua ntities history c urveat any position near the exp losive, and reproduce the phenome non for the up lift ofconcrete target, throw and sp lash. It can get the damage effect law by calc ulatingdifferent buried deep explosion damage effect.Fina lly, the paper study bulging process of multila yered compact medium underinterna l b last loading of a luminized explos ive by e xperiment and numerica lsimulation. Compared with the experiment, the numerica l simulation based oncoup ling method of AUTODY is calc ulated by d ifferent factors, such as preformed hole, gro und base, thickness of concrete plate, and buria l depth of e xplos ive incompact materia l. And comparative study of ideal exp losive and aluminized explos iveis also presented in this paper. Simulations show that buria l depth of explos ive,ground base are more sens itive to the bulging process of co mpact materia l than theothers. Conclus ions of this paper can be referenced by b lasting design of compactmaterial.