Topic
Indentation
About: Indentation is a research topic. Over the lifetime, 13002 publications have been published within this topic receiving 340476 citations.
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TL;DR: In this paper, the authors investigated the effect of penetration depth on the experimental results of nano-indentation and proposed a manual indentation method, which combines information from backscattered electron (BSE) image analysis and X-ray diffraction (XRD) method.
110 citations
110 citations
TL;DR: The Poroelastic relaxation relaxation Indentation (PRI) testing approach as discussed by the authors was proposed for quantifying the mechanical and transport properties of thin layers of poly(ethylene glycol) hydrogels with thickness on the order of 200 μm.
Abstract: In this work, we present the Poroelastic Relaxation Indentation (PRI) testing approach for quantifying the mechanical and transport properties of thin layers of poly(ethylene glycol) hydrogels with thicknesses on the order of 200 μm. Specifically, PRI characterizes poroelastic relaxation in hydrogels by indenting the material at fixed depth and measuring the contact area-dependent load relaxation process as a function of time. With the aid of a linear poroelastic theory developed for thin or geometrically confined swollen polymer networks, we demonstrate that PRI can quantify the water diffusion coefficient, shear modulus and average pore size of the hydrogel layer. This approach provides a simple methodology to quantify the material properties of thin swollen polymer networks relevant to transport phenomena.
110 citations
TL;DR: In this paper, a modified expanding cavity model was used to predict the plastic zone size characterized by the shear bands and to identify the stress components responsible for the evolution of various types of shear band.
109 citations
TL;DR: In this paper, the energy dissipated during normal indentation of coated materials is analyzed and related to the coating and interfacial fracture toughness, and the relationship between irreversibly dissipated energy and the ratio of the hardness to elastic modulus is analyzed in detail and it is shown that this relationship is similar as for monolithic materials, although various fracture events occurred.
Abstract: The energy dissipated during normal indentation of coated materials is analyzed and related to the coating and interfacial fracture toughness. Hybrid organic–inorganic coatings, which were prepared using a sol–gel process, were used as model materials. The loading and unloading curves are integrated and the differences in irreversibly dissipated energy after delamination and chipping are used to calculate the energy release rates. The calculated energy release rates are inversely proportional to the coating thickness and a factor of up two tens larger than previous results. Furthermore, it is shown that the energy dissipated during indentation is a measure of the system's response and that the system's response is altered by the fracture events. Extrapolation to infinite coating thickness leads to values that are in agreement with previously published results. The relationship between irreversibly dissipated energy and the ratio of the hardness to elastic modulus is analyzed in detail and it is shown that this relationship is similar as for monolithic materials, although various fracture events occurred, thus suggesting that the underlying relationship is independent of the history of the coating–substrate system.
109 citations