A New Force-Displacement Model for Continuous Indentation of Bilayer Materials

2001 ◽  
Vol 695 ◽  
Author(s):  
A. Nayebi ◽  
R. El Abdi ◽  
G. Mauvoisin ◽  
O. Bartier
Keyword(s):  
Flow Stress ◽  
Strain Hardening ◽  
Indentation Load ◽  
Numerical Results ◽  
Stress And Strain ◽  
Proposed Model ◽  
Displacement Model ◽  
Force Displacement ◽  
Continuous Indentation

ABSTRACTA new relationship between indentation load and depth in relation to flow stress and strain hardening exponents of film and substrate of bilayers is given. The comparison between the numerical results and those experimentally obtained from known materials, confirms the interest of the proposed model for film characterization of these materials.

Analysis of Hot Anisotropic Tensile Flow Stress and Strain Hardening Behavior for Inconel 625 Alloy

2019 ◽  
Vol 28 (12) ◽  
pp. 7537-7553 ◽  
Author(s):  
C. Anand Badrish ◽  
Nitin Kotkunde ◽  
Gauri Mahalle ◽  
Swadesh Kumar Singh ◽  
K. Mahesh
Keyword(s):  
Flow Stress ◽  
Strain Hardening ◽  
Inconel 625 ◽  
Stress And Strain ◽  
Hardening Behavior ◽  
Inconel 625 Alloy ◽  
Strain Hardening Behavior

A Normal Force-Displacement Model for Contacting Spheres Accounting for Plastic Deformation: Force-Driven Formulation

1999 ◽  
Vol 67 (2) ◽  
pp. 363-371 ◽  
Author(s):  
L. Vu-Quoc ◽  
X. Zhang ◽  
L. Lesburg
Keyword(s):  
Plastic Deformation ◽  
Plastic Flow ◽  
Normal Force ◽  
Contact Point ◽  
Continuum Theory ◽  
Spherical Particles ◽  
Proposed Model ◽  
Deformation Force ◽  
Displacement Model ◽  
Force Displacement

In this paper, we present a simple and accurate model for the normal force-displacement (NFD) relation for contacting spherical particles, accounting for the effects of plastic deformation. This NFD model, based on the formalism of the continuum theory of elastoplasticity, is to be used in granular flow simulations involving thousands of particles; the efficiency of the model is thus a crucial property. The accuracy of the model allows for an accurate prediction of the contact force level in the plastic regime. In addition to being more accurate than previously proposed NFD models, the proposed NFD model also leads to more accurate coefficient of restitution that is a function of the approaching velocity of two particles in collision. The novelty of the present NFD model is the additive decomposition of the contact-area radius, and the correction of the curvature of the particles at the contact point due to plastic flow. The accuracy of the proposed model is validated against nonlinear finite element results involving plastic flow in both loading and unloading conditions. [S0021-8936(00)03102-0]

Recovery of AlMg alloys: flow stress and strain-hardening properties

1998 ◽  
Vol 47 (1) ◽  
pp. 127-134 ◽  
Author(s):  
M. Verdier ◽  
Y. Brechet ◽  
P. Guyot
Keyword(s):  
Flow Stress ◽  
Strain Hardening ◽  
Stress And Strain

Comparisons of Constitutive Models for Steel Over a Wide Range of Temperatures and Strain Rates

2012 ◽  
Vol 134 (2) ◽  
Author(s):  
Farid Abed ◽  
Fadi Makarem
Keyword(s):  
Flow Stress ◽  
Strain Hardening ◽  
Shear Bands ◽  
Constitutive Models ◽  
Steel Structures ◽  
High Strength ◽  
Stress And Strain ◽  
Strain Rates ◽  
Wide Range ◽  
Strain Hardening Behavior

This study investigates and compares several available plasticity models used to describe the thermomechanical behavior of structural steel subjected to complex loadings. The main purpose of this comparison is to select a proper constitutive model that can later be implemented into a finite element code to capture localizations (e.g., shear bands and necking) in steel and steel structures subjected to low- and high-velocity impact. Four well-known constitutive models for viscoplastic deformation of metals, i.e., Johnson–Cook (JC), Zerilli–Armstrong (ZA), Rusinek–Klepaczko (RK), and Voyiadjis–Abed (VA), have been investigated and compared with reference to existing deformation data of HSLA-65 and DH-36 steel conducted at low and high strain rates and various initial temperatures. The JC, ZA, and RK models reasonably describe the flow stress and the strain hardening behavior only in the certain ranges of strain, strain rate, and temperature for which the models were developed. This was attributed to the inaccurate assumptions used in developing these models. In contrast, the VA model most effectively describes the flow stress and strain hardening in which very good predictions are observed for the constitutive behavior of high strength steel over a wide range of strains, strain rates, and temperatures.

scholarly journals Dynamic Tensile Behaviour of Strain-Hardening Cement-Based Composites (SHCC)

2018 ◽  
Vol 183 ◽  
pp. 02015 ◽  
Author(s):  
Iurie Curosu ◽  
Viktor Mechtcherine ◽  
Daniele Forni ◽  
Ezio Cadoni
Keyword(s):  
Strain Hardening ◽  
Rate Sensitivity ◽  
Material Design ◽  
Matrix Composition ◽  
Tensile Behaviour ◽  
Dynamic Tests ◽  
Different Types ◽  
Direct Tensile ◽  
Force Displacement

The paper presents a part of an experimental campaign consisting of quasi-static and impact tensile experiments on three different types of strain-hardening cement-based composites (SHCC) as well as on their constitutive cementitious matrices [1]. The investigation on different SHCC types was intended for analysing the effect of matrix composition and fibre type on the strain rate sensitivity of the composites and for enabling the formulation of material design recommendations for impact resistant SHCC. The dynamic tests were carried out by means of a Modified Hopkinson Bar (MHB) installed in the DynaMat Laboratory in Lugano, Switzerland, which enabled the characterization of the dynamic material behaviour under direct tensile loading in terms of force-displacement relationships.

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