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← ScienceWhich outcome occurs when the shape functions poorly approximate true solutions for structural finite element simulations?
A)Computed stress concentrations become inaccurate✓
B)Element stiffness matrix remains orthogonal
C)Nodal displacements converge to zero
D)Increased computational efficiency erroneously observed
💡 Explanation
Inaccurate shape functions will poorly represent real-world structural behavior, hence the computed stress concentrations become inaccurate because strains are derived from shape function spatial derivatives; therefore the incorrect strains lead to inaccurate stresses, rather than correct stress or enhanced convergence.
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