DYNAMIC CRUSHING OF UNIFORM AND DENSITY GRADED CELLULAR STRUCTURES BASED ON THE CIRCLE ARC MODEL
Keywords:CELLULAR STRUCTURE, CIRCLE ARC MODEL, DENSITY GRADIENT, DYNAMIC CRUSHING, CRITICAL STRAIN
AbstractA NEW CIRCLE-ARC MODEL WAS ESTABLISHED TO PRESENT THE CELLULAR STRUCTURE. DYNAMIC RESPONSE OF MODELS WITH DENSITY GRADIENTS UNDER CONSTANT VELOCITIES IS INVESTIGATED BY EMPLOYING LS-DYNA 971. COMPARED WITH THE UNIFORM MODELS, THE QUASI-STATIC PLATEAU STRESS OF DIFFERENT LAYERS SEEMS A SIGNIFICANT PARAMETER CORRELATED WITH THE DEFORMATION MODE EXCEPT FOR INERTIA EFFECT WHEN THE DENSITY GRADIENT IS INTRODUCED. THE IMPACT VELOCITY BECOMES MUCH MORE VITAL ON THE DEFORMATION OF THE UNIT CELL THAN THE DENSITY GRADIENT. THE STRESS AT BOTH THE IMPACT AND STATIONARY SIDES IS INVESTIGATED IN DETAILS. FURTHERMORE, THE STRESS-STRAIN CURVE IS COMPARED WITH THE MODIFIED SHOCK WAVE THEORY. THE DENSITY GRADIENT DOES HAVE SOME REMARKABLE INFLUENCE ON THE ENERGY ABSORPTION CAPABILITY, AND A CERTAIN DENSITY GRADIENT IS NOT ALWAYS BENEFICIAL TO THE ENERGY ABSORPTION. IRRESPECTIVE OF THE IMPACT VELOCITY, THERE SEEMS ALWAYS A CRITICAL STRAIN WHERE THE ENERGY ABSORBED BY ALL THESE SPECIMENS COULD APPROXIMATE TO NEARLY THE SAME VALUE. SO THE CRITICAL STRAIN-VELOCITY CURVE IS PLOTTED AND GIVES THE BENEFICIAL AREA FOR ENERGY ABSORPTION PERTINENT TO DENSITY GRADIENTS AND IMPACT VELOCITY.
Authors who publish with this journal agree to the following terms:
- Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Creative Commons Attribution License [CC BY] that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
- Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
- Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).