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The scaling laws of cabin structures subjected to internal blast loading: Experimental and numerical studies 1 1. Introduction 1 2. Experimental studies 2 2.1. Experimental setup 2 2.2. Experimental results 2 2.2.1. Deformation overview 2 2.2.2. Deformation evolution process 4 2.2.3. Internal blast pressure 5 3. Numerical studies 6 3.1. Finite element model 6 3.2. Material model and parameter 7 3.2.1. Model and parameter for PETN 7 3.2.2. Model and parameter for steel cabin boxes 7 3.3. Sensitivity study of the element size 7 3.4. Strain rate effect verification 8 3.5. Numerical results 8 4. Discussion 9 4.1. Effect of strain-rate ε ̇ on deflection 9 4.2. Effect of scaling factor β and scaled distance Z on deflection-to-thickness ratio δ/h 10 5. Conclusion 10 Declaration of competing interest 11 Acknowledgements 11 References 11