> For the complete documentation index, see [llms.txt](https://tlcfem.gitbook.io/suanpan-manual/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://tlcfem.gitbook.io/suanpan-manual/material/material1d/elastic/nle1d01.md).

# NLE1D01

Nonlinear Elastic 1D Type 01

The `NLE1D01` material is a smoothed uniaxial bilinear elastic material model which uses the MP formula to approximate the bilinear backbone.

## Syntax

```
material NLE1D01 (1) (2) (3) (4) (5) [6]
# (1) int, unique material tag
# (2) double, elastic modulus
# (3) double, turning stress
# (4) double, hardening ratio
# (5) double, radius of transition
# [6] double, density, default: 0
```


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