## Abstract

The friction factor is a key input for "barrel compression test" and for a meaningful interpretation of the test data. Despite its widespread use, due to the complexity of the problem, there are very few solutions available for the test, la alone for the friction factor. Extended-Avitzur (EA) model has serious known limitations to calculate the friction factor. To estimate the friction factor more reliably, a closed-form solution of the friction factor has been proposed here. The solution is based on the "Exponential Profile Model" (EPM) and provides an instantaneous value for the friction factor. It simply relies on the sample's initial and deformed dimensions. Unlike existing experimental procedures, the proposed solution integrates the test results and friction factor identification based on a single set of experimental load-displacement-barreling data. Merits of the model and its solution were highlighted and compared to those of the conventional Cylindrical Profile Models (CPM5). A finite element model was developed as the reference to produce pseudo-experimental test data and to verify the presented solution. The deformation data were used in the EPM and the EA model to calculate the friction factors by each model and to compare them with the reference data as the benchmark. Contrary to EA's estimated friction factors, those identified by the EPM were in good agreement with the reference values. Recommendations were provided to identify a deformation zone at which the EPM's friction factor can be estimated meaningfully.

Original language | English |
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Article number | 106175 |

Number of pages | 11 |

Journal | International Journal of Mechanical Sciences |

Volume | 193 |

DOIs | |

Publication status | Published - 1-Mar-2021 |

## Keywords

- Friction factor
- contact
- kinematic solution
- foldover
- compression test