Formation of one type of expanded metal
Some commonly used shapes of expanded metal are circles, squares, and diamonds. Diamonds are the most popular shapes because of how well the shape absorbs energy and resists mechanical deformation after installation. Other design considerations are the size and angles of the shapes. These also affect how well the metal absorbs energy and where the energy is spread throughout the expanded metal.
For the diamond shape, there are at least four different angles that come into account, the two acute and two obtuse angles. The larger the angles, the less strength the shape will have because there would be too much space inside the shape. However, if the angles are too small, strength is lost because the shape is too close together, so there is no space for the structure to hold.
The angle in which the shapes are laid also plays a significant role. If the angle is zero the ends of the shape point to the start and the end of the sheet. This makes straight lines across the sheet of diamonds. This option provide the most strength when it comes to compressing the sheet on its side. More pressure is taken than a solid piece of metal because the sheet will compress and spread the pressure throughout.
The four commonly used angles are 60˚, 90˚, 90˚ plus 60˚, and 60˚ plus 90˚. A 60˚ angle puts the diamond diagonal at the start and end to the sheet. A 90˚ angle makes the diamond vertical to the start and the end of a sheet. The 90˚ plus 60˚ and 60˚ plus 90˚ angles combine both a 60˚ angle and a 90˚ angle; the order of the angles is respective to the order in naming.