STUDY OF CRACKS IN CONCRETE TARGET UNDER DEEP PENETRATION BY A PROJECTILE
A LARGE NUMBER OF CRACKS OCCUR IN CONCRETE STRUCTURE AFTER PROJECTILE PENETRATION. IN THIS PAPER, WIRE SAW CUTTING, X-RAY COMPUTED TOMOGRAPHY (X-CT) AND MECHANICAL PROPERTY TESTING OF DAMAGED CONCRETE WERE CARRIED OUT ON DEEP PENETRATION TARGETS. ACCORDING TO X-CT IMAGES AND THE MECHANICAL PROPERTIES OF DAMAGED CONCRETE, THE CRACK DISTRIBUTION OF THE TARGET WAS DIVIDED INTO A PLASTIC DAMAGE ZONE AND A BRITTLE DAMAGE ZONE; THE MICROCRACKS IN THE PLASTIC DAMAGE ZONE WERE TRANSFORMED BY MACROCRACKS, AND THE MACROCRACKS IN THE BRITTLE DAMAGE ZONE PROPAGATED LOCALLY. THE INITIAL GROWTH PROCESS OF THE CRACKS WAS OBTAINED BY X-CT IMAGES; THE CRACKS IN THE PURE MORTAR TARGET BEGAN TO PROPAGATE IN THE RADIAL DIRECTION AND GRADUALLY TURNED TOWARD THE TANGENTIAL DIRECTION, WHILE THE TARGET CONTAINING COARSE AGGREGATE DIRECTLY FORMED TANGENTIAL CRACKS. THE PROPAGATION OF CRACKS WAS ANALYZED IN IMAGES OF TARGET SECTIONS; TANGENTIAL CRACKS PROPAGATED ASYMMETRICALLY, AND THE NUMBER OF RADIAL CRACKS GRADUALLY DECREASED DUE TO BEING BLOCKED BY TANGENTIAL CRACKS; THE TANGENTIAL CRACKS BENT IN THE PURE MORTAR TARGET AND WERE RELATIVELY STRAIGHT IN THE TARGET CONTAINING COARSE AGGREGATE. A CRACK PROPAGATION MODEL WAS ESTABLISHED, AND THE TANGENTIAL CRACK FORMULA AND THE CRACK PROPAGATION VELOCITY WERE OBTAINED.
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).