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Multicycle indentation based fatigue and creep study of polymers

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Abstract

Polymers are the latest designed materials used in structural, fitting, joint, and other applications. Three thermoplastic polymers, named Polyether ether ketone (PEEK), Poly (methyl methacrylate) (PMMA), and Poly-tetra-fluoro-ethylene (PTFE), have been subjected to the constant load multicycle (CLMC) micro-indentation method. In this study, the fatigue and creep behaviour of the materials has been assessed using the load-displacement curve produced from the indentation method. The primary goal of this paper is to examine the polymer's cycle fatigue behaviour by taking into account the repetitive loading and the resulting hysteresis loop. A technique based on stress and energy was used to study the polymer's fatigue behaviour. In these stress- and energy-based techniques, respectively, hardness (H) and plastic energy (EP) correspond with fatigue life (N). In the fatigue life prediction of polymers, the fatigue toughness, or a total of hysteresis energy, was studied. In addition, these viscoelastic polymers experience time-dependent deformation when a force is applied. By examining the depth (h) with holding time (tH) data, multicycle micro indentation is utilised to determine the creep behaviour of polymers. This study discusses developing a simple and practical approach for calculating the creep and back creep displacement of polymers with the holding time at maximum and minimum load. The fatigue and creep properties of the polymer can be assessed simultaneously using a CLMC indentation.

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Data availability

Data will be made available on request.

Abbreviations

\(A\) :

Indenter contact area

\(E\) :

Elastic modulus of the materials

\({E}_{i}\) :

Elastic modulus of indenter

\({E}_{P}\) :

Dissipated plastic Hysteresis energy

\({E}_{T}\) :

Total absorbed energy or fatigue fracture of the materials

\(H\) :

Hardness of the materials

h :

Creep displacement of the material

N :

Number of Cycles

P :

Applied indenter load

t :

Holding time of the indenter

v :

Poisson ratio of the materials

v i :

Poisson ratio of the indenter

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Acknowledgements

The authors gratefully acknowledge the sincere cooperation of the members of the Tribology Laboratory of the Indian Institute of Technology, Kharagpur.

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  1. Department of Mechanical Engineering, Indian Institute of Technology Kharagpur, Kharagpur, West Bengal, 721302, India

    Soumya Ranjan Guru & Mihir Sarangi

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  1. Soumya Ranjan Guru
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Correspondence to Soumya Ranjan Guru.

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Guru, S.R., Sarangi, M. Multicycle indentation based fatigue and creep study of polymers. J Polym Res 30, 401 (2023). https://doi.org/10.1007/s10965-023-03774-8

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