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《Acta Mechanica Solida Sinica》 2003年03期
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THE APPLICATION OF DISCRETE ELEMENT METHOD IN SOLVING THREE-DIMENTIONAL IMPACT DYNAMICS PROBLEMS

【摘要】:正 A three-dimensional discrete element model of the connective type is presented.Moreover,a three-dimensional numerical analysis code,which can carry out the transitional pro-cess from connective model(for continuum)to contact model(for non-continuum),is developedfor simulating the mechanical process from continuum to non-continuum.The wave propagationprocess in a concrete block(as continuum)made of cement grout under impact loading is numer-ically simulated with this code.By comparing its numerical results with those by LS-DYNA,thecalculation accuracy of the model and algorithm is proved.Furthermore,the failure process ofthe concrete block under quasi-static loading is demonstrated,showing the basic dynamic tran-sitional process from continuum to non-continuum.The results of calculation can be displayedby animation.The damage modes are similar to the experimental results.The two numericalexamples above prove that our model and its code are powerful and efficient in simulating thedynamic failure problems accompanying the transition from continuum to non-continuum.It alsoshows that the discrete element method(DEM)will have broad prospects for development andapplication.

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