# Introduce imperfections to nonlinear buckling analysis

**URL:** https://prepomax.discourse.group/t/introduce-imperfections-to-nonlinear-buckling-analysis/2499
**Category:** General Questions
**Created:** [February 27, 2025, 12:47pm UTC](https://prepomax.discourse.group/t/introduce-imperfections-to-nonlinear-buckling-analysis/2499 "2025-02-27T12:47:36Z")
**Posts on this page:** 2
**Page:** 2

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### Author: ![Michal](https://avatars.discourse-cdn.com/v4/letter/m/34f0e0/32.png) [@Michal](https://prepomax.discourse.group/u/Michal)
#### Post date: [March 1, 2025, 9:20pm UTC](https://prepomax.discourse.group/t/introduce-imperfections-to-nonlinear-buckling-analysis/2499/21 "2025-03-01T21:20:50Z")

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Yes I agree but this is very basic sample

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### Author: ![synt](https://yyz2.discourse-cdn.com/free1/user_avatar/prepomax.discourse.group/synt/32/4658_2.png) [@synt](https://prepomax.discourse.group/u/synt)
#### Post date: [March 1, 2025, 9:32pm UTC](https://prepomax.discourse.group/t/introduce-imperfections-to-nonlinear-buckling-analysis/2499/22 "2025-03-01T21:32:27Z")

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negative Jacobian error is related to individual element shape, no matter how the problem size is.

previous mesh deformation of multiple curvature (true scale) being used for transverse loads testing, still found no issue you mentioned.

 ![2025-03-02 04_52_11-](https://global.discourse-cdn.com/free1/uploads/prepomax/original/2X/8/81eec33e224995ee8b07cfa56c468a06bffef050.png)

 ![2025-03-02 04_52_35-](https://global.discourse-cdn.com/free1/uploads/prepomax/original/2X/0/07ab08dc58b4677071f8884ce791a68120ada21c.png)

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