Understanding Autofrettage  

Oleh:

Wanke, Vieri

Jenis: Article from Bulletin/Magazine - ilmiah internasional
Dalam koleksi: Machine Design (Soft Copy ada dalam http://search.proquest.com/) vol. 83 no. 6 (Apr. 2011), page 50-52.
Topik: Fretting; Metalworking Industry; Engineers

Ketersediaan

Perpustakaan Pusat (Semanggi) Nomor Panggil: MM44.64 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada

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Autofrettage is a little-known metalworking process that typically applies only to components subject to pressures above 15,000 psi pulsating at frequencies above 5 Hz. Common examples include cannon and gun barrels, liners and jackets for high-pressure pumps, and automotive common-rail injection components for cars and trucks. In the engineering world, autofrettage alters a container's inside surface by inducing permanent compression to the material's inner layers -- even in the absence of internal pressure. One approach to autofrettage involves peening the surface with metallic or ceramic spheres. Under static pressure high stresses may be tolerated, provided engineers apply an appropriate safety factor. But if pressure swings between high and low values at frequencies higher than 5 Hz, the material is stressed such that fatigue becomes a dangerous concern. Autofrettage helps alleviate the problem. Estimates are that autofrettage postprocessing increases the ability to withstand pulsating pressure spikes by a factor of 1.8 in tubes with substantial thicknesses. This gives engineers the leeway to reduce thickness without sacrificing performance.

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