With the fracture model in hand, the TLSPH method is coupled with the WCSPH method to simulate the breaking dam flow impacting on an elastic/elastoplastic baffle. Aiming at the problem that the original TLSPH method could not simulate the cracks and their propagation, the fracture model based on TLSPH is established, and then verified by fast-loading and slow-loading cases respectively. In this paper, the coupled weakly compressible (WC) and total Lagrangian (TL) smoothed particle hydrodynamics (SPH) model based on the open-source multi-physics and multi-resolution SPHinXsys library is used to simulate the structural deformation and failure problem in fluid-structure interaction (FSI). 6TUM School of Engineering and Design, Technical University of Munich, Garching, Germany.5Center for Hydrosphere Science, Key Laboratory of Engineering Software, Dongguan University of Technology, Dongguan, China.4School of Environment and Civil Engineering, Dongguan University of Technology, Dongguan, China.3Key Laboratory of Water Ecology Remediation and Protection at Headwater Regions of Big Rivers, Ministry of Water Resources, Xining, China.2Laboratory of Ecological Protection and High-Quality Development in the Upper Yellow River, Xining, China.1School of Water Resources and Electric Power, Qinghai University, Xining, China.Haitao Wu 1,2,3, Shenglong Gu 1,2,3*, Lirong Tian 1,2,3, Jiaye Li 4,5*, Chen Chen 4,5 and Chi Zhang 6

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