scholarly journals Mapping viscoelastic and plastic properties of polymers and polymer-nanotube composites using instrumented indentation

2016 ◽  
Vol 31 (15) ◽  
pp. 2347-2360 ◽  
Author(s):  
Andrew J. Gayle ◽  
Robert F. Cook
Keyword(s):  
Instrumented Indentation ◽  
Plastic Properties ◽  
Nanotube Composites ◽  
Image Position

Abstract

scholarly journals Numerical verification for instrumented spherical indentation techniques in determining the plastic properties of materials

2009 ◽  
Vol 24 (12) ◽  
pp. 3653-3663 ◽  
Author(s):  
Taihua Zhang ◽  
Peng Jiang ◽  
Yihui Feng ◽  
Rong Yang
Keyword(s):  
Numerical Experiments ◽  
Spherical Indentation ◽  
Numerical Verification ◽  
Instrumented Indentation ◽  
Plastic Properties ◽  
Wide Range ◽  
Validity Range ◽  
Indentation Tests ◽  
Properties Of Materials ◽  
Indentation Methods

Instrumented indentation tests have been widely adopted for elastic modulus determination. Recently, a number of indentation-based methods for plastic properties characterization have been proposed, and rigorous verification is absolutely necessary for their wide application. In view of the advantages of spherical indentation compared with conical indentation in determining plastic properties, this study mainly concerns verification of spherical indentation methods. Five convenient and simple models were selected for this purpose, and numerical experiments for a wide range of materials are carried out to identify their accuracy and sensitivity characteristics. The verification results show that four of these five methods can give relatively accurate and stable results within a certain material domain, which is defined as their validity range and has been summarized for each method.

Numerical analysis of different methods to calculate residual stresses in thin films based on instrumented indentation data

2012 ◽  
Vol 27 (13) ◽  
pp. 1732-1741 ◽  
Author(s):  
Carlos Eduardo Keutenedjian Mady ◽  
Sara Aida Rodriguez ◽  
Adriana Gómez Gómez ◽  
Roberto Martins Souza
Keyword(s):  
Thin Films ◽  
Numerical Analysis ◽  
Residual Stresses ◽  
Instrumented Indentation ◽  
Image Position

Abstract

Application of a portable indentation rig with Rockwell indenter to determine mechanical properties and residual stresses on an aluminum plate

2020 ◽  
Vol 55 (7-8) ◽  
pp. 246-257
Author(s):  
Saba Salmani Ghanbari ◽  
Amir-Hossein Mahmoudi
Keyword(s):  
Mechanical Properties ◽  
Residual Stresses ◽  
Structural Integrity ◽  
Indentation Load ◽  
Instrumented Indentation ◽  
Unknown Parameters ◽  
Plastic Properties ◽  
Wide Range ◽  
Portable Apparatus ◽  
Non Destructive

Measuring residual stresses is still a dilemma in many engineering applications. It is even more crucial when the industrial requirements demand for a non-destructive technique in order to avoid compromising the structural integrity of the engineering components. Furthermore, estimating the mechanical properties of the materials, especially when the components are aged, is of importance. Instrumented indentation has gained much interest in recent years. There are many studies in the literature which are focused on measuring residual stresses or mechanical properties using instrumented indentation. Since in many cases there is no possibility of transferring large samples or those under service, for possible measurements, having a portable rig can be very useful. Furthermore, indentation procedure is a low-cost non-destructive method with high accuracy which is able to measure the plastic properties of material as well as its residual stresses on which the designing and construction of the portable apparatus were based. The instrumented indentation testing details were followed according to the ASTM E2546-15 standard practice. In this research, a wide range of simulations were performed on a group of aluminum alloys in order to estimate the equi-biaxial residual stresses by analyzing the indentation load–displacement curves which were obtained from the experimental outcomes. Then neural networks were employed to estimate the unknown parameters. The performance accuracy of the designed portable apparatus and the acceptable precision of the introduced method were then verified with experimental tests performed on Al 2024-T351.

LCF Assessment of Electron-Beam-Welded Notched Parts of Nickel-Based Superalloy Inconel 718

2014 ◽  
Author(s):  
Huang Yuan ◽  
Jie Fang
Keyword(s):  
Fatigue Life ◽  
Critical Distance ◽  
Instrumented Indentation ◽  
Critical Plane ◽  
Plastic Properties ◽  
Welding Material ◽  
Weld Joints ◽  
Nickel Based Superalloy ◽  
Element Simulation ◽  
Indentation Analysis

In the present work the local mechanical behavior and fatigue resistance of the welding material were investigated with help of the instrumented indentation technique in combining with FEM computations. By assuming a power-law strain hardening, the elastic-plastic properties of the welding material were identified from inverse indentation analysis with help of finite element simulation. A critical plane based Cruse-Meyer model was introduced to predict the LCF fatigue life of the weld joints. Combined with the critical distance concept, the fatigue life in center-holed specimens was investigated and verified with experiments.

Mechanical behavior assessment of sucrose using nanoindentation

2007 ◽  
Vol 22 (7) ◽  
pp. 2037-2045 ◽  
Author(s):  
K.J. Ramos ◽  
D.F. Bahr
Keyword(s):  
Experimental Study ◽  
Plastic Deformation ◽  
Shear Stress ◽  
Elastic Modulus ◽  
Slip System ◽  
Single Crystals ◽  
Maximum Shear Stress ◽  
Model Material ◽  
Instrumented Indentation ◽  
Plastic Properties

An experimental study of the elastic and plastic properties of sucrose single crystals, which can be considered to be a model material for both pharmaceutical excipients and explosives, has been carried out using nanoindentation. Instrumented indentation was used to characterize the properties of both habit and cleavage planes on the (100) and (001) orientations; the elastic modulus on the (100) is 38 GPa, while the modulus on the (001) is 33 GPa. The hardness of sucrose is approximately 1.5 GPa. Nanoindentation enables assessment of the onset of plastic deformation on cleaved surfaces, and a maximum shear stress of 1 GPa can be supported prior to plastic deformation. The deformation in this material is crystallographically dependent, with pileup around residual indentation impressions showing evidence of preferential slip system activity.

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