elastic second-order analysis vs nonlinear second-order analysis
elastic second-order analysis vs nonlinear second-order analysis
(OP)
what is the difference between elastic second-order analysis vs nonlinear second-order analysis?
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elastic second-order analysis vs nonlinear second-order analysis
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RE: elastic second-order analysis vs nonlinear second-order analysis
The "order" that you speak of typically refers to the order (number of the highest order exponent in a polynomial equation) of the element shape function with respect to the primary variable.
RE: elastic second-order analysis vs nonlinear second-order analysis
RE: elastic second-order analysis vs nonlinear second-order analysis
The best way to approach your question is to look at how these analyses are used. Elastic analysis is typically used with an ASD (allowable stress design). Non-linear is typically used with LRFD (Load and Resistance Factor Design). Do you understand the difference between these two approaches?
RE: elastic second-order analysis vs nonlinear second-order analysis
The non-linear elastic analysis does not assume a consistent E but checks throughout the analysis whether any portion of the model yields and then exhibits a different, lower modulus - adjusts the model to reflect this inelastic state, and then proceeds to continue the analysis through further steps in the iterative analysis.
Both are second order in that they take into account the models deflections and how those deflections affect the response of the model to the applied loads.
RE: elastic second-order analysis vs nonlinear second-order analysis