Getting Help from Hardness Testing  

Oleh:

Ellis, Norm

Jenis: Article from Bulletin/Magazine - ilmiah internasional
Dalam koleksi: Machine Design (Soft Copy ada dalam http://search.proquest.com/) vol. 83 no. 12 (Jul. 2011), page 56-64.
Topik: Hardness Testing; Heat Treating; Design Engineering; Quality Control

Ketersediaan

Perpustakaan Pusat (Semanggi) Nomor Panggil: MM44 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada

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Isi artikel

Many steel, aluminum, and copper parts must be heat treated before or during assembly. Heat treatments alter the metals' strength, toughness, and corrosion resistance. And designers increasingly rely on mechanical properties of nonmetallic materials like plastics and elastomers for less-expensive, lighter, and more-aesthetically pleasing parts. So, engineers may need to specify material hardnesses for outside vendors. They may also need to verify heat treatments were performed correctly and check material composition. Hardness testing measures a material's surface ability to withstand distortion. Generally, hardness testing is considered a destructive test because it leaves dents in the materials. On parts ready for final assembly, such dents are made on nonstructural areas of the part. Engineers performing hardness tests must choose the right tests and hardness scales based on the materials, their thickness, and heat-treatment processes. Traditional tests include Rockwell, Brinell, Shore, Scleroscope, Vickers, Knoop, and Mohns. Shore and Scleroscope tests are considered nondestructive.

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