Consequences assessment of explosions in pipes using coupled FEM-SPH method

• Published in: Journal of loss prevention in the process industries Vol. 43; pp. 549 - 558
• Main Authors: Du, Yang, Zhang, Fan, Zhang, Anda, Ma, Li, Zheng, Jinyang
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01.09.2016; Elsevier Science Ltd
• Subjects: Blast wave; Boundary conditions; Consequences assessment; Crack propagation; Dynamic fracture; Energy dissipation; Finite element analysis; Pipe explosion; Plastic deformation; Simulation; Smoothed particle hydrodynamics; Blast wave; Smoothed particle hydrodynamics; Pipe explosion; Dynamic fracture; Consequences assessment
• ISSN: 0950-4230; 1873-3352
• DOI: 10.1016/j.jlp.2016.07.023

Explosions often lead to destruction of equipment, which is a difficult problem including complicated fluid-solid interactions. Most traditional CFD methods cannot synchronously solve the movements of fluids and large deformation and fracture of solids because such problem is usually accompanied with constantly moving-and-changing boundary conditions. In this paper, a coupled Finite Element Method-Smoothed Particle Hydrodynamics (FEM-SPH) method was proposed to simulate the dynamic processes of explosions in pipes. The propagation of blast wave and the fracture of pipe were captured in every timestep, where the energy dissipation caused by plastic deformation and crack propagation were fully considered. A rate-dependent failure criterion for high-strain-rate load conditions was employed in the numerical simulation, which was presented in our previous work and has been verified in the dynamic fracture behavior of steels for pressure vessels and pipes. In addition, a simpler formula was proposed to describe the attenuation of blast wave outside the pipe and the consequences caused by the explosions were assessed. Results revealed the interaction between blast wave and pipe, the leakage of detonation products, the attenuations of peak overpressures outside the pipe and the corresponding consequences at different distances. It is found that when considering the energy consumption during plastic deformation and crack propagation in coupled FEM-SPH method, the assessment results are more rational than that without considering such energy consumption. •A coupled FEM-SPH method is proposed to study the consequences of explosions occurring in pipes.•Energy consumption during plastic deformation and crack propagation of pipe are well considered.•The experimental crack propagation behavior and final fracture pattern are well reproduced numerically.•The coupled FEM-SPH method can give more rational consequences assessment results compared with traditional CFD methods.