scholarly journals Identification of the elastic–plastic constitutive model for measuring mechanical properties of metals by instrumented spherical indentation test

2017 ◽  
Vol 7 (2) ◽  
pp. 221-228 ◽  
Author(s):  
Taihua Zhang ◽  
Chang Yu ◽  
Guangjian Peng ◽  
Yihui Feng
Keyword(s):  
Mechanical Properties ◽  
Constitutive Model ◽  
Indentation Test ◽  
Spherical Indentation ◽  
Elastic Plastic ◽  
Image Position

Abstract

Characterization of mechanical properties of metallic foams by instrumented indentation test

2018 ◽  
Vol 115 (4) ◽  
pp. 405
Author(s):  
Ali Nayebi ◽  
Azam Surmiri
Keyword(s):  
Mechanical Properties ◽  
Finite Element ◽  
Constitutive Model ◽  
Indentation Test ◽  
Metallic Foam ◽  
Spherical Indentation ◽  
Metallic Foams ◽  
Aluminum Foams ◽  
Inelastic Behaviour ◽  
Indentation Response

In this study, the spherical indentation tests with a spherical rigid indenter of 5 mm radius were used. The inelastic behaviour of metallic foam was considered as an isotropic crushable foam constitutive model of Deshpande and Fleck which has been shown experimentally that their model can be applied to aluminum foams. The spherical indentation test was modeled by finite element method. A 2D axisymmetric model was developed. Practically, the size of the indenter tip should be reasonably large compared to the size of the cells/pores in the specimen and the indentation depth should also be reasonably large so that the indentation response does reflect the averaged material behaviours, which are described by the aforementioned constitutive model. The applied load on the indenter versus its displacement was obtained under different metallic foam mechanical properties. Numerical results from the finite element simulations are used to obtain the dependence of the indentation response on the metallic foam material parameters which characterizes the plastic deformation of metallic foams. Finally, the stress–curves and the elastic modulus of different foams are obtained by the indentation curve, which is obtained by FEM.

Improvement of predicting mechanical properties from spherical indentation test

2016 ◽  
Vol 117 ◽  
pp. 182-196 ◽  
Author(s):  
Yingzhi Li ◽  
Paul Stevens ◽  
Mingcheng Sun ◽  
Chaoqun Zhang ◽  
Wei Wang
Keyword(s):  
Mechanical Properties ◽  
Indentation Test ◽  
Spherical Indentation

scholarly journals Spherical indentation method for estimating equibiaxial residual stress and elastic–plastic properties of metals simultaneously

2018 ◽  
Vol 33 (8) ◽  
pp. 884-897 ◽  
Author(s):  
Guangjian Peng ◽  
Zhike Lu ◽  
Yi Ma ◽  
Yihui Feng ◽  
Yong Huan ◽  
...  
Keyword(s):  
Residual Stress ◽  
Spherical Indentation ◽  
Indentation Method ◽  
Plastic Properties ◽  
Elastic Plastic ◽  
Image Position

Abstract

Effect of Nonlinear Kinematic Hardening Constants on Cyclic Spherical Indentation Test

2010 ◽  
Author(s):  
A. Nayebi
Keyword(s):  
Mechanical Properties ◽  
Finite Element ◽  
Applied Load ◽  
Kinematic Hardening ◽  
Hysteresis Loops ◽  
Indentation Test ◽  
Material Behavior ◽  
Spherical Indentation ◽  
Displacement Curve ◽  
Residual Displacements

In the last decade, instrumented indentation test has been widely used to determine the mechanical properties of different materials and especially for metals. The mechanical properties such as Young modulus, yield stress, hardening exponent, and stress-strain curve were determined with the help of the load–displacement curve of the continuous indentation test. The method consists of pushing an indenter in a material sample and the applied load and the indenter displacement are measured. In this research the load on the indenter was considered as cyclic and varied from zero to Fmax. Because of the Bauschinger effect, the hysteresis loops were formed. With the help of these hysteresis loops, nonlinear kinematic hardening parameters of the Armstrong–Freiderick (A-F) model can be determined. Spherical indenter was used and the sample was considered isotropic. The material behavior was modeled by the A-F rule. The test was modeled by the finite element method. An axi-symmetric mesh was used. The A–F model constants, C and γ, were varied to obtain their effects on the hysteresis loops. Maximum applied load was considered constant for different finite element modeling and the maximum and residual displacements were calculated from the simulations results. The normalized maximum and the residual displacements were increased as a function of the cycles. It was shown that these parameters value and their rate are dependent on the material model constants. These dependences were shown for different examples which can help to characterize the A-F model constants by the cyclic spherical indentation tests.

scholarly journals An integrated method to determine elastic–plastic parameters by instrumented spherical indentation

2014 ◽  
Vol 29 (9) ◽  
pp. 1095-1103 ◽  
Author(s):  
Chang Yu ◽  
Yihui Feng ◽  
Rong Yang ◽  
Guangjian Peng ◽  
Zhike Lu ◽  
...  
Keyword(s):  
Spherical Indentation ◽  
Elastic Plastic ◽  
Integrated Method ◽  
Image Position

Abstract

Test and Simulation of Indentation and Scratch on ZnS

2013 ◽  
Vol 770 ◽  
pp. 50-53
Author(s):  
Guang Yao ◽  
Bing Guo ◽  
Chang Hao Wu
Keyword(s):  
Mechanical Properties ◽  
Constitutive Model ◽  
Process Parameters ◽  
Indentation Test ◽  
Scratch Test ◽  
Nanoindentation Test ◽  
Removal Mechanism ◽  
Precision Grinding ◽  
Ultra Precision ◽  
Micro Indentation

This paper discusses the grinding performance of ZnS. Its the base for ultra-precision grinding to master the mechanical properties and removal mechanism of ZnS which is an infrared material. This study determined the hardnessfracture toughness and critical grinding depth by micro-indentation test; Based on the result of nanoindentation test, constitutive model of ZnS was established and simulation of indentation and scratch were completed. Grinding removal mechanism and effect of process parameters on scratch result were explored by scratch test. It was found that test was consistent with simulation.

Sign in / Sign up

Export Citation Format

Share Document