Results 241 to 250 of about 204,727 (297)

Comparison between Stress-Strain Plots Obtained from Indentation Plastometry, Based on Residual Indent Profiles, and from Uniaxial Testing

Acta Materialia, 2018
This paper is focused on comparisons between stress-strain plots from conventional uniaxial (tensile or compressive) testing and those obtained from indentation experiments, via iterative FEM modeling of the process in which the plasticity is represented
J. Campbell, R. Thompson, J. Dean, T. Clyne   +3 more
semanticscholar   +1 more source

Finite indentation of an elastic membrane by a spherical indenter [PDF]

International Journal of Non-Linear Mechanics, 1968
Abstract Rotationally symmetric stresses and deformations are considered for a pre-stressed elastic sheet of circular outer boundary loaded transversely by a centered indenter with a hemispherical tip. A non-linear membrane solution for stresses and deflections of the indented membrane is obtained.
N.M. Bhatia, W. Nachbar
openaire   +1 more source

Indentation of an Orthotropic Half-Space by a Rigid Ellipsoidal Indenter

Journal of Tribology, 2003
Anisotropic materials represent a unique class of materials, including crystals, wood, thin-films, and composites. Existing work in the literature has provided the engineering community with an in-depth understanding of isotropic contact mechanics, and the methodologies for solving isotropic contact problems have been fully developed.
Shi, D, Ovaert, TC, Lin, Y
openaire   +4 more sources

Instrumented indentation of fused silica by Berkovich indenter

Journal of Non-Crystalline Solids, 2017
Abstract Scaling relationships among indentation variables such as the maximum indentation displacement, contact depth, the ratio of load over contact stiffness, and the ratio of permanent displacement over the maximum displacement were investigated via Berkovich indentation of fused silica.
Chenghui Gao, Ming Liu
openaire   +2 more sources

NANO-INDENTATION USING SPHERICAL INDENTERS

Nondestructive Testing and Evaluation, 2001
Abstract Depth sensing nano-indentation can be used to determine the mechanical properties of materials in situations where conventional test methods may be difficult or inappropriate to apply. Experimental materials may only be available in small quantities, as a component in a composite or as a coating on a dissimilar substrate.
openaire   +2 more sources

Elastic/Plastic Indentation Damage in Ceramics: The Median/Radial Crack System

, 1980
A theory for describing the evolution of the median/radial crack system in the far field of sharp-indenter contacts is developed. Analysis is based on a model in which the complex elastic/plastic field beneath the indenter is resolved into elastic and ...
B. Lawn, A. Evans, D. Marshall
semanticscholar   +1 more source

Shape Effects of Indenter on the Depth-Sensing Indentation

Advanced Materials Research, 2010
It is revealed that the conventional reduced modulus used in depth-sensing indentation tests is invalid for a flat-ended cylindrical indenter due to the fact that the contact area during the loading is a constant irrelative to load. The load-displacement curve of flat punch is related to the length of the punch and the ratio of the elastic modulus of ...
Xin Yong Shi, Li Zhong Liu, Yi Wang Bao
openaire   +2 more sources

Calculation of Indentation Hardness Based on Indentation Energy

Advanced Materials Research, 2011
Comparing advantages and disadvantages of Oliver-Pharr method, microhardness method and indentation energy method, this article propses the improvement of indentation energy method. The improvement of indentation energy method mainly takes the calculation of energy and pile-up and sink-in phenomenon into account.
G.Q. Pan, Zhi Rong Liao, Yong Ze Guo, X.R. Liang, Li Zhou   +4 more
openaire   +2 more sources

A numerical study of indentation with small spherical indenters

Acta Mechanica Solida Sinica, 2009
The finite element method for the conventional theory of mechanism-based strain gradient plasticity is used to study the indentation size effect. For small indenters (e.g., radii on the order of 10 μm), the maximum allowable geometrically necessary dislocation (GND) density is introduced to cap the GND density such that the latter does not become ...
Yonggang Huang, Xue Feng, Shaoxing Qu, Jiang Qin, Jianliang Xiao, Keh Chih Hwang   +5 more
openaire   +2 more sources

Indentation size effect in spherical and pyramidal indentations

Journal of Physics D: Applied Physics, 2008
The indentation size effect (ISE) is studied for spherical and pyramidal indentations on a Ni poly-crystal. The indentation experiments were conducted using a Berkovich geometry as well as different spherical indenters with radii of 0.38, 3.8 and 51.0??m.
George M. Pharr, George M. Pharr, Mathias Göken, Karsten Durst   +3 more
openaire   +2 more sources