Individual materials are stored in the materials object. Each section inside the sections object should be identified by a unique positive integer.
|materials||Object||Each material is defined as an object with properties.|
|name||String||-||The name of the material.|
|density||Number||Mass/Length3||The density of the material.|
|elasticity_modulus||Number||Pressure||Modulus of elasticity of the material. Also known as Young's Modulus.|
|poissons_ratio||Number||-||Poisson's Ratio, also known as coefficient of expansion.|