angol - magyar Műszaki Mechanika / gépészet cső alakú test előállítása

Stress/strain graphs of the two materials during the "auto-frettage" process:
Both materials start with the same zero loading (point1) and when the composite tubular body described above is subjected to an internal pressure loading to a predetermined "shakedown" pressure limit which is above the yield strain (point 2) of the inner pipe 12 but below the yield strain of the outer casing 16, 26 the inner pipe 12 undergoes yielding and plastic deformation (points 3 and 4) whilst the outer casing 16, 26 remains within its elastic limits as it reaches the stress loadings at its corresponding points 3* and 4*.

GB (Scotland), Patent Application