Abstract
Effects of dwell time and loading/unloading rate on the nanoindentation behavior of polyethylene-based nanocomposites
Highlights
The purpose of this paper is to investigate the effects of parameters like loading, unloading rates, and dwell period on the depth-sensing indentation properties is
Nanofillers dispersion and distribution in the neat polymer matrix is a vital factor in the production of nanocomposites that can significantly
The application of the dwell period at maximum indentation load is one way to reduce the impact of nose on the nanoindentation results
Summary
The purpose of this paper is to investigate the effects of parameters like loading, unloading rates, and dwell period on the depth-sensing indentation properties is. A bowing out or nose is the most common behavior for polymeric materials in nanoindentation tests due to the viscoelastic behavior This leads to the negative slope and significant errors in the calculations of hardness and elastic modulus values using depth-sensing indentation techniques. A bowing out or nose is the most common behavior for polymers in nanoindentation tests due to the viscoelastic behavior (Altaf et al, 2012; Briscoe et al, 1998; Ngan and Tang, 2002; Cheng et al, 2005b; Lu et al, 2009) This can lead to a negative slope (Oyen and Cook, 2003), which invalidates the assumption of elastic unloading, and leads to a major error in the calculation of contact depth and contact stiffness. It is common practice to eliminate or minimize the creep effect through a rapid unloading rate (Cheng et al, 2005a) or a long dwell/holding time at maximum
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