The 'Lagrangian description' of motion in solid mechanics tracks:
Choose the correct answer
Fixed spatial points in the flow domain
Individual material points — follows each particle from initial to deformed configuration; used in solid mechanics FEA
Only the final deformed state
Average motion of all particles
Correct Answer
B. Individual material points — follows each particle from initial to deformed configuration; used in solid mechanics FEA
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Lagrangian (material) description: tracks individual material particles through motion. Reference: initial configuration. Deformation gradient F = ∂x/∂X (current position x vs reference X). Used in: large deformation solid mechanics, FEA of metals, geomechanics. Contrasts with Eulerian (spatial, used in fluid mechanics): fixed point in space through which material flows.
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