**Definition**:

Poisson's Ratio is the ratio of the transverse to the longitudinal strains under axial stress within the elastic range. It is a negative ratio.

Poisson's Ratio is named after french physicist SimÃ©on Poisson (1781-1840). When a material is compressed in one direction, it usually tends to expand in the other two directions perpendicular to the direction of compression. This phenomenon is called the

**Poisson effect**.

Typical values of Poisson's Ratio for various commonly used materials are given below:

Poisson's Ratio

Material | Poisson's ratio |
---|---|

rubber | ~ 0.55 |

gold | 0.42 - 0.44 |

saturated clay | 0.40–0.49 |

magnesium | 0.35 |

titanium | 0.34 |

copper | 0.33 |

aluminium-alloy | 0.32 |

clay | 0.30–0.45 |

stainless steel | 0.30–0.31 |

steel | 0.27–0.30 |

cast iron | 0.21–0.26 |

sand | 0.20–0.45 |

concrete | 0.20 |

glass | 0.18–0.3 |

foam | 0.10–0.40 |

cork | ~ 0.00 |

Here is a related video about Poisson's Ratio of materials. This video is taken from youtube.com.

tag: poison, poissan, pisson, pisson

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