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High-Velocity Single Particle Impact and Shear instability
Posted 2026年3月11日 GMT+9 00:58 Structural Mechanics, Structural Dynamics Version 6.4 1 Reply
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Hi everyone, I'm currently working on a high‑velocity impact simulation using the Solid Mechanics interface with the Johnson–Cook plasticity model. I keep running into repeated failures in the elastoplastic update.
Here is a summary of the situation:
Material model: Johnson–Cook A = 90 MPa B = 292 MPa n = 0.31 C = 0.025 m = 1.09
Mesh: ~0.25 µm element size (≈ d/100 for a 25 µm particle) Loading: the particle starts with an initial velocity and travels across a small gap before contacting the substrate Time stepping: explicit, Δt ≈ 3×10⁻14 Local method: Backward Euler (Damped) Mass matrix: lumped Explicit time stepping - Verlet Method with Adams-Bashforth 2 Auxiliary solver. Steps taken by solver: Manual - ts.
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Dear Monil Thakkar,
Thank you for posting on the Discussion Forum. After looking over your questions we feel that these questions may require specialized assistance from our Technical Support Team. Please email to support@comsol.com with your questions and supporting model files and we will address them via those channels. I think your model process should also consider the new functionalities of structural mechanics analyses and especially the "time explicit" simulation capabilities.
Best regards, Daniele Panfiglio
