{"id":157865,"date":"2022-06-06T09:57:51","date_gmt":"2022-06-06T09:57:51","guid":{"rendered":"\/knowledge\/forums\/topic\/is-it-possible-to-create-a-nonlinear-spring-with-an-initial-preload\/"},"modified":"2022-06-06T09:57:51","modified_gmt":"2022-06-06T09:57:51","slug":"is-it-possible-to-create-a-nonlinear-spring-with-an-initial-preload","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/knowledge\/forums\/topic\/is-it-possible-to-create-a-nonlinear-spring-with-an-initial-preload\/","title":{"rendered":"Is it possible to create a nonlinear spring with an initial preload?"},"content":{"rendered":"

Yes, but not directly. COMBIN39 can be used to model a nonlinear spring, but it doesn’t have preload option. In addition, its elongation vs force curve must pass through the origin (0,0).
One approach is to run a multi-step analysis with the preload applied in the first load step and the additional loads applied in later steps. For example, if nonlinear, displacement-force spring curve is (0,300), (1,350), (2,400). You could:
1. create a nonlinear COMB39 spring
2. define displacement-force curve that is offset by the preload [e.g. (0,0), (1,300), (2,350), (3,400) for 1 mm of preload]
3. apply the preload in step 1 [1 mm displacement or 300 N force)
4. apply additional loads in subsequent load steps<\/p>\n","protected":false},"template":"","class_list":["post-157865","topic","type-topic","status-publish","hentry","topic-tag-combin39","topic-tag-nonlinear-spring"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t