Residual stresses in cold-coiled helical compression springs for automotive suspensions measured by neutron diffraction

0103253 - UFP-V 20040122 RIV US eng J - Journal Article
Matějíček, Jiří - Brand, P. C. - Drews, A. R. - Krause, A. - Lowe-Ma, C.
Residual stresses in cold-coiled helical compression springs for automotive suspensions measured by neutron diffraction.
[Zbytková pnutí v za studena vinutých automobilových pružinách měřená pomocí neutronové difrakce.]
Materials Science and Engineering A Structural Materials Properties Microstructure and Processing. Roč. 367, 1-2 (2004), s. 306-311. ISSN 0921-5093. E-ISSN 1873-4936
Institutional research plan: CEZ:AV0Z2043910
Keywords : residual stress, automotive springs, neutron diffraction
Subject RIV: JB - Sensors, Measurment, Regulation
Impact factor: 1.445, year: 2004

Residual stresses in cold-coiled helical compression springs for automotive suspensions were determined at several manufacturing stages using neutron diffraction. These results indicate that the residual stresses in the as-coiled springs are nearly uniaxial with peak values of +/-900MPa and independent of coil position. A factory stress-relieved spring showed the same pattern of stresses, but with the peak values reduced to ~+/-200 MPa. Residual stresses in a spring annealed in a laboratory furnace at 56 K over the normal factory annealing temperature were ~35% lower. The effect of cutting the springs either by electric discharge machining (EDM) or by abusive grinding was also examined. From these data, the smallest spring segment that can yield reliable stress data was determined.

Zbytková pnutí v za studena vinutých automobilových pružinách byla měřena pomocí neutronové difrakce po různých fázích zpracování. Byl určen průběh a maxima pnutí po vinutí, žíhání na různých teplotách. Sledováním pnutí v postupně zmenšovaném segmentu byla určena nejmenší část, která ještě obsahuje spolehlivé informace o pnutí, využitelná např. pro měření rtg. difrakcí.
Permanent Link: http://hdl.handle.net/11104/0010566