Look up: peening

1. 
   Peening
   The mechanical working of metals by means of hammer blows. Peening tends to stretch the surface of the cold metal, thereby relieving contraction stresses.
   Found on http://www.diracdelta.co.uk/science/sour
   
   
2. 
   Peening
   A stream of sharp material particles which break superficial fibres, reducing internal stress fields.
   Found on http://www.poeton.co.uk/w1/glossary.htm
   
   
3. 
   peening
   technique which consists in deforming a metal part by a series of hammer blows,for example to set a rivet or burr end of bolt to prevent loss of the nut Category: Transport • mechanical working of metal by hammer blows or shot impingement Category: Iron and steel industries
   Found on http://www.mijnwoordenboek.nl/definition
   
   
4. 
   Peening
   `Peening` is the mechanical working of metals by means of hammer blows or by blasting with shot (shot peening). Peening is a cold work process. It tends to expand the surface of the cold metal, thereby relieving tensile stresses and/or inducing compressive stresses. Peening also encourages strain hardening of the surface metal.
   Found on http://en.wikipedia.org/wiki/Peening
   
   
5. 
   Peening
   The stretching of metal by hammering or rolling the surface.
   Found on http://www.allmetalcorp.com/htm/pg8_8_00