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Table 9 The limit load factor λ cr / m p for a clamped circular plate subjected to a parabolic load

From: Upper bound limit analysis of plates using a rotation-free isogeometric approach

a 3 Tresca(UB) Square(UB) Quadratic Cubic
−3 4.172 4.469 4.358 4.244
−2 3.821 4.074 4.019 3.904
−1 3.524 3.744 3.728 3.644
1 3.037 3.222 3.254 3.144
2 2.854 3.002 3.059 2.952
3 2.684 2.827 2.886 2.781