# MultilinearElastic1D

Uniaxial Multilinear Elastic Material

## Theory

A simple uniaxial multilinear elastic material model. The [`BilinearElastic1D`](https://tlcfem.gitbook.io/suanpan-manual/material/material1d/elastic/bilinearelastic1d) model is a special case of this model.

## Syntax

```
material MultilinearElastic1D (1) (2 3...) [4]
# (1) int, unique material tag
# (2) double, strain of the data point
# (3) double, stress of the data point
# [4] double, density, default: 0.0
```

## Usage

The first point does not need to be origin. Starting from the first non-zero point is fine. Multiple data points can be defined. A constant response is assumed after the last point.

```
material MultilinearElastic1D 1 1E-3 35 2E-3 40 3E-3 45 4E-3 30
```

![example one](https://4006314410-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2F-MQ5rMqEBbzA9NgGETGX%2Fuploads%2Fgit-blob-e564ad7cc80a9773c9ee7545536d859764b94379%2FMultilinearElastic1D.svg?alt=media)