# Snap fit analysis **URL:** https://prepomax.discourse.group/t/snap-fit-analysis/3196 **Category:** General Questions **Created:** [January 16, 2026, 4:39am UTC](https://prepomax.discourse.group/t/snap-fit-analysis/3196 "2026-01-16T04:39:02Z") **Posts on this page:** 1 **Showing post:** 2
### Author: ![FEAnalyst](https://yyz2.discourse-cdn.com/free1/user_avatar/prepomax.discourse.group/feanalyst/32/688_2.png) [@FEAnalyst](https://prepomax.discourse.group/u/FEAnalyst) #### Post date: [January 16, 2026, 8:07am UTC](https://prepomax.discourse.group/t/snap-fit-analysis/3196/2 "2026-01-16T08:07:05Z")
Your amplitude is from t=0 to t=1 s but the time period of the step is only 0.01 s so it completes just 1% of the desired movement. Your setup is partially different than in the tutorial. Why are you using shells instead of plane strain elements ? Keep in mind that such snap-fit analyses are extremely problematic to converge and obtain good results in CalculiX due to tricky contact conditions. My case was discussed here: [Snap-fit contact snagging problem - CalculiX (official versions are on www.calculix.de, the official GitHub repository is at https://github.com/Dhondtguido/CalculiX).](https://calculix.discourse.group/t/snap-fit-contact-snagging-problem/2277) You can also find similar (and other) tips for a different snap-fit case here: [Insertion and withdrawal force calculation with plastic deformation](https://prepomax.discourse.group/t/insertion-and-withdrawal-force-calculation-with-plastic-deformation/3097) --- _[View the full topic](https://prepomax.discourse.group/t/snap-fit-analysis/3196)._