An efficient CDEM-based method to calculate full-scale fragment field of warhead. (November 2019)

• Record Type: Journal Article
• Authors: Wang, Haozhe; Bai, Chunhua; Feng, Chun; Xue, Kun; Zhu, Xinguang
• Is Part Of: International journal of impact engineering. Volume 133(2019)
• Publication Date: 2019-11
• Subjects: Fragments field -- Continuum-based discrete element method -- Cross-scale calculation -- Detonation product leakage algorithm; Impact -- Periodicals; Shock (Mechanics) -- Periodicals; Impact -- Périodiques; Choc (Mécanique) -- Périodiques; Impact; Shock (Mechanics); Periodicals; 620.1125
• DOI: 10.1016/j.ijimpeng.2019.103331
• Languages: English
• ISSNs: 0734-743X

Abstract

Highlights: On the basis of continuous-discontinuous numerical simulation method, an analysis model which can fully simulate the fragment field in the full space-time domain is formed, resolving the problems of large deformation and cross-scale calculation in warhead research. CDEM is applicable for completely describing the whole process from breakage of the warhead casing to dispersion and landing of the fragments. No similar method has been found in current literature. The full-scale fragment field calculated by this method has high precision, and deviates less than 10% from experimental values. The fragment equivalent layer-detonation product leakage algorithm improves computing efficiency reducing the calculation time by more than 50% compared with commercial software, greatly saving resources. Combined with the penetrable target board system, the CDEM provides foundations to study fragmentation safety distance with different states and types of warhead in subsequent research. Abstract: Warhead's full-scale fragment field has great significance to military production and storage safety. In this paper, an improved Continuum-Discontinuum Element Method (CDEM) will be used for the first time to solve the problems of large deformation and cross-scale calculations for warheads, describing the complete process from casing breakage to fragment scattering and landing. A fragment equivalent layer-detonation product escape algorithm is further introduced to increase calculation efficiency, and the fragmentation field is post-processed using a penetrable virtual target board algorithm. This method simulates warhead fragmentation in the full space-time domain, laying a foundation for subsequent study of questions like warhead fragmentation safety distance and fuze delay arming time. Comparison with warhead static explosion and ballistic gun testing data verify the effectiveness of this method.