简介：Polycrystallineceramicshaveheterogeneousmeso-structureswhichresultinhighsingularityinstressdistribution.Basedonthis,aprogressivefragmentmodelwasproposedwhichdescribesthefailurewaveformationandpropagationinshockedceramics.Thegoverningequationofthefailurewavewascharacterizedbyinelasticbulkstrainwithmaterialdamageandfracture.Andtheinelasticbulkstrainconsistsofdilatantstrainfromnucleationandexpansionofmicrocracksandcondensedstrainfromcollapseoforiginalpores.Numericalsimulationofthefreesurfacevelocitywasperformedingoodagreementwithplanarimpactexperimentson92.93％aluminasatChinaAcademyofEngineeringPhysics.Andthelongitudinal,lateralandshearstresshistoriesuponthearrivalofthefailurewavewerepredicted,whichpresentthediminishedshearstrengthandlostspallstrengthinthefailedlayer.