The Dynamics of Frequency-Specific, Depth-Sensing Indentation Testing

Abstract

Depth-sensing indentation involves applying a specific force-time history on a rigid indenter while continuously monitoring the displacement of the indenter into the surface. Frequency specific depth-sensing indentation testing entails adding a small harmonic force on the indenter and measuring the harmonic response of the indenter at the excitation frequency. While often taken for granted, understanding the dynamics behind these frequency specific measurements is of vital importance in the determination of quantitative mechanical properties. This paper will focus on the dynamics of a variety of depth-sensing indentation systems and how these dynamics affect such parameters as detecting the point of surface contact, environmental sensitivity, dynamic frequency range, and the range over which contact stiffnesses and moduli can be accurately measured.

Scaling, dimensional analysis, and indentation measurements

“…A number of authors [240][241][242][243][244][245][246][247] have in recent years proposed experimental hardware and analysis procedures for determining the storage and loss modulus from instrumented indentation experiments using, for example, DMA, nanoindenters, or atomic force microscope with controlled oscillatory loads or displacements. Taking the advantage of the high lateral resolution, many of these techniques allow mapping of storage and loss modulus.…”

Влияние Малоамплитудных Осцилляций Нагрузки На Наноконтактные Характеристики Материалов В Процессе Наноиндентирования

“…6 [7][8][9][10], так что последовательное при-менение выражений (2), (3) и (6) позволяет находить твердость в любой точке диаграммы нагружения. Как следствие, при этом происходит сканирование твердости по глубине отпечатка в единственном испытании, что заменяет целую серию испытаний методом традицион-ного NI [7,38,39]. 3.…”

Magnetical Response and Mechanical Properties of High Temperature Superconductors, YBaCu3O7-X Materials

“…However, for soft compliant materials (like polymers and biological tissues), the rate of increase in load and contact stiffness is often too small to allow for accurate surface identification. In these situations, a better method is sometimes offered by dynamic stiffness measurement (Pethica et al, 1989;Lucas et al, 1998).…”