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Gun Liner Bond Strength Studies

Experiments have been conducted to see if internal grooves machined in steel cylinders will lead to higher bond strengths produced by the Gun Liner Emplacement with an Elastomeric Material (GLEEM) process. Groove depth and twist angle were varied. Both experimental and analytical studies showed that at the pressures used, there was little movement of the liner material into the machined grooves. However, the liner was seen to conform to very small machining marks in the steel cylinder inner bore, providing an increase in the coefficient of friction. Bond strengths of over 30 MPa were obtained.