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Topic review (newest first)
First of all, have you checked the convergence errors?
If there is a difference between the full N-R (tangent stiffness) and modified N-R (elastic stiffness, update each step), it usually means at least one of these two methods haves convergence problems.
Please see http://www.cervenka.cz/products/atena/k … es-it-mean
In most cases, this is due to some problem in the geometry, boundary conditions (supports, loads, master-slave connections), or in cases of extreme material damage. After checking all former possible problem sources, you may also need to shorten the load steps and/or allow more iterations to let the steps converge.
hi sir, i was preparing one model of a gfrp wrapped beam n i found some difficulty........acutualy i was not getting a good graph when i used ' tangent' option in the general tab of solution parameter, but when i used 'elastic' option it gave me a graph which was except-able...........so does make any difference in the result by choose between - tangent & elastic - in the stiffness box.....thanks.
