Failure analysis and life prediction of polymeric rollers for industrial applications

The present study investigates the behaviour of polymeric rollers employed in a cam mechanism of an industrial machine, consisting of two concentrically fitted rings made of polyurethane and short fibre-reinforced PEEK. A cyclic mechanical characterisation of the materials was at first carried out by strain controlled fatigue tests. The safe range of working conditions of the rollers in terms of rotating speed and contact load was then investigated by rolling contact tests carried out on roller prototypes with a dedicated test rig. These tests allowed obtaining important information about the different damage mechanisms occurring in the component: above a critical working temperature, rollers failure resulted from rings unfitting due to excessive deformations, while fatigue crack nucleation in the outer ring at the interface with the inner one was observed below this threshold, at high contact load levels. No contact fatigue damage appeared. FEM models of the roller were also developed, based on cyclic material data, in order to analyse the cyclic stress and strain field and to predict the fatigue life, finding a satisfactory agreement with the experimental rolling contact tests results.

[1]  L. Ye,et al.  Tribological properties of high temperature resistant polymer composites with fine particles , 2007 .

[2]  W. Gregory Sawyer,et al.  A low friction and ultra low wear rate PEEK/PTFE composite , 2006 .

[3]  S. Kurtz,et al.  Fatigue crack propagation resistance of virgin and highly crosslinked, thermally treated ultra-high molecular weight polyethylene. , 2006, Biomaterials.

[4]  M. Boyce,et al.  Stress–strain behavior of thermoplastic polyurethanes , 2005 .

[5]  F. Abraham,et al.  The effect of minimum stress and stress amplitude on the fatigue life of non strain crystallising elastomers , 2005 .

[6]  B. Rodgers.  Rubber compounding : chemistry and applications , 2004 .

[7]  S. Kurtz,et al.  An augmented hybrid constitutive model for simulation of unloading and cyclic loading behavior of conventional and highly crosslinked UHMWPE. , 2004, Biomaterials.

[8]  R. P. Skelton,et al.  A Code of Practice for the determination of cyclic stress-strain data , 2002 .

[9]  Charlie R. Brooks,et al.  Failure Analysis of Engineering Materials , 2001 .

[10]  L. Pruitt,et al.  The effect of cyclic true strain on the morphology, structure, and relaxation behavior of ultra high molecular weight polyethylene , 2001 .

[11]  M. Niinomi,et al.  Fatigue characteristics of ultra high molecular weight polyethylene with different molecular weight for implant material , 2001, Journal of materials science. Materials in medicine.

[12]  S. Bahadur.  The development of transfer layers and their role in polymer tribology , 2000 .

[13]  C. Rimnac,et al.  Cyclic steady state stress-strain behavior of UHMW polyethylene. , 2000, Biomaterials.

[14]  W. Bonfield,et al.  Fatigue characterization of a hydroxyapatite-reinforced polyethylene composite. I. Uniaxial fatigue. , 2000, Journal of biomedical materials research.

[15]  B. S. Nau,et al.  An historical review of studies of polymeric seals in reciprocating hydraulic systems , 1999 .

[16]  S. Kukureka,et al.  The effect of PTFE on the friction and wear behavior of polymers in rolling-sliding contact , 1998 .

[17]  T. Stolarski,et al.  Surface fatigue of polymers in rolling contact , 1998 .

[18]  D L Bartel,et al.  Residual stresses in ultra‐high molecular weight polyethylene loaded cyclically by a rigid moving indenter in nonconforming geometries , 1998, Journal of orthopaedic research : official publication of the Orthopaedic Research Society.

[19]  J. Haponiuk,et al.  Application of the DSC analysis of thermoplastic polyurethane elastomers to a comparative study of their technological properties , 1990 .

[20]  R. J. Crawford,et al.  Some fatigue characteristics of thermoplastics , 1975 .

[21]  B. Tomkins,et al.  Low endurance fatigue in metals and polymers , 1969 .

[22]  Lisa A. Pruitt,et al.  Compression and tension fatigue resistance of medical grade ultra high molecular weight polyethylene: the effect of morphology, sterilization, aging and temperature , 2000 .

[23]  J. Kichenin,et al.  Finite-element simulation of a new two-dissipative mechanisms model for bulk medium-density polyethylene , 1996, Journal of Materials Science.

[24]  J. Trotignon.  A new universal fatigue machine for plastics and composites , 1995 .

[25]  R. Hertzberg,et al.  Fatigue of engineering plastics , 1980 .

[26]  P. Beardmore,et al.  Cyclic deformation and fracture of polymers , 1974 .