Preprint Article Version 1 This version is not peer-reviewed

Dynamic Response Mechanism of Thin-Walled Metallic Defensive Structure from Explosion in Transportation

Version 1 : Received: 6 March 2020 / Approved: 7 March 2020 / Online: 7 March 2020 (15:40:40 CET)

How to cite: Yao, S.; Zhao, N.; Zhang, D.; Wang, Z.; Chen, Z. Dynamic Response Mechanism of Thin-Walled Metallic Defensive Structure from Explosion in Transportation. Preprints 2020, 2020030122 (doi: 10.20944/preprints202003.0122.v1). Yao, S.; Zhao, N.; Zhang, D.; Wang, Z.; Chen, Z. Dynamic Response Mechanism of Thin-Walled Metallic Defensive Structure from Explosion in Transportation. Preprints 2020, 2020030122 (doi: 10.20944/preprints202003.0122.v1).

Abstract

Defensive structure is important in transportation field for kinds of intentional or unintentional explosion. Structures subjected to unconfined and confined explosion will bear different blast loads and their dynamic responses are different. The present work focus on the dynamic response mechanism of steel plate under unconfined and confined blast loads through both numerical and experimental studies. In the experiment, Digital Image Correlation (DIC) technique was applied to record and analyze the dynamic response process of large-scale field blast test. The DIC measured curve and the numerical calculated curves agrees well in both the trends and the peak values. Then, the dynamic response mechanism of steel plate under unconfined blast (UB) load and confined blast (CB) load were compared and discussed. Results show that the dynamic response of plate can be divided into three phases under both UB and CB loads, while with different mechanism. In phase I, plastic hinge starts from the center and moves to the boundary in UB condition, while in case of CB, plastic hinge occurs close to the boundary and moves in the opposite direction. In phase II, two plastic hinge lines propagates towards each other, and a platform exists between the boundary and the central area remains undeformed in UB condition, while in CB condition, larger deformation in peripheral region rather than central area produces.

Subject Areas

unconfined blast; confined blast; digital image correlation; dynamic response; blast loading

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