Dead-ring test

The hammer test, or dead-ring test, is required by DOT and TC regulations for 10-year retest criteria for specification 3A and 3AA cylinders. The hammer test is primarily an indicator of internal corrosion but may also indicate accumulation of liquid and foreign material in... 

Alternative to the constant load tensile test, a spring or proof ring is used in place of dead-weight and the load/deflection relationship for the particular geometry is... 

Note To test, tap the wheel gently with a light non-metallic instrument. If it sounds cracked or dead, it could fly apart in operations, so do not use it. The sound of an undamaged wheel will be a clear metallic tone or ring. ... 

A stationary block is forced against a rotating ring by a dead-weight load. The bottom part of the ring is immersed in a water-oil emulsion. The presence of the water-oil emulsion is a drawback in this test because the actual wear behavior in an extruder with a polymer melt as the intermediate material between screw and barrel is bound to be substantially different from the wear behavior in the LFW-1 test appa-... 

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