Abstract
Interfacial friction is a key aspect to understanding and modelling dynamic processes in which materials interact. However, friction is a complex phenomenon that depends on a multitude of factors, including sliding velocity. Understanding how friction behavior changes as a function of sliding rate is thus crucial for accurately simulating dynamic processes. Recent literature has shown that the split-Hopkinson pressure bar can be adapted for friction measurements associated with high sliding rates. The present work introduces an insert designed to be transferrable between a quasi-static load frame and a compression split-Hopkinson bar, enabling friction measurements across a wide range of sliding velocities (10-4 – 20 m/s). Here, the split-Hopkinson pressure bar setup is modelled using a multiphysics research code (FLAG), developed at Los Alamos National Laboratory (LANL), to identify and reduce potential issues in the configuration prior to experimental implementation.
Highlights
Interfacial friction significantly affects the behavior of dynamic systems in which materials interact
The sample response is significantly affected by the boundary condition at the rod/sample interface, where the free condition results in minimal sliding at the friction interface and significant sample deformation
A new experimental configuration for measuring dynamic friction using a compression split-Hopkinson pressure bar (SHPB) was modelled with a multi-physics code, FLAG
Summary
Interfacial friction significantly affects the behavior of dynamic systems in which materials interact. To accurately model dynamic processes that occur at a range of rates, friction behavior must be understood over a multitude of sliding velocity regimes. The split-Hopkinson pressure bar (SHPB) is an experimental apparatus that allows for the measurement of material properties at relatively high strain rates, ranging from 102 – 104 s-1 [1], [2]. Several adaptations of the SHPB have been designed to allow for the measurement of dynamic friction at relatively high sliding rates. This is typically achieved by replacing the traditional sample with a fixture that translates the strain pulse (compression, torsion, or tension) into sliding between two interfaces. The friction coefficient is calculated from the measured friction force and known applied normal force
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