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Sol 400 is a set of application modules in the msc nastran system that pairs the full features of msc nastran with the nonlinear capabilities of the marc solver to analyze a wide variety of structural problems subjected to geometric and material nonlinearity, and contact. I remember a tip in one of the nastran manuals, keep a log of your solution run times, and use it to improve the speed of your solution Yes, the large strain option may impact your solution, but i'm certain you can turn it on. Solution 400 is the nonlinear analysis component to the fea industry standard, msc nastran, and has been used in the field for over 10 years With solution 400, msc software has enhanced msc nastran’s capabilities to enable users to run even more complex analyses. The first form is used in sol 400 where the algorithms of marc are embedded completely in msc nastran to form a completely integrated msc nastran solution We recommend this as the default solution for solving msc nastran nonlinear problems. The only difference between the two models is that for one, i specify a failure model thanks to matf and ask for the strength ratios with param,srcomps,yes Doing that, i obtain a 40% higher stress I have made sure that sr>>1 so that progressive failure or yielding can't be the cause of that. We have a demo copy of msc.nastran and that also gives the same behavior It makes sense because autospc constrains the free end of the rod except in the axial direction. Msc nastran sol 400 provides advanced nonlinear capabilities by merging the proven technology from marc with msc nastran It makes it possible for msc nastran users to add advanced nonlinear capabilities to their already existing linear models without leaving their familiar simulation platform. Different materials experience different failure characteristics and sol 400 in msc nastran provides multiple failure criteria options Sol 400 supports linear and nonlinear fracture mechanics in order to determine the conditions under which crack propagation occurs. This manual provides a complete background to msc nastran implicit nonlinear (sol 400) and describes using sol 400 within the msc nastran environment The theoretical aspects of nonlinear analysis methods, types, and techniques are included as well as thorough descriptions for nonlinear material models, properties, and loads and constraints. The simple element used in this example is similar to the msc nastran crod element described in the next chapter but without the torsional stiffness Using the cbar element for this example is acceptable However, the element matrices are larger without providing any additional insight.