Representative Stress-Strain Curve by Spherical Indentation on Elastic-Plastic Materials

Chang, Chao; Garrido, Miguel Angel Amaró; Ruiz-Hervías, J.; Zhang, Zhu; Zhang, Lele

doi:10.1155/2018/8316384

Cited by 14 publications

(28 citation statements)

References 47 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Even if attention is limited to spherical indenters, the number of articles of this type is large. [14][15][16][17][18][19][20][21][22][23][24][25][26][27] The procedure may or may not involve representing the complete (plastic) stress-strain curve with an analytical expression. It may also be noted that methodologies have been suggested [28][29][30][31] that are based on the use of neural network techniques (essentially curve-fitting operations) to correlate load-displacement characteristics with corresponding stress-strain curves.…”

Section: Iit Proceduresmentioning

confidence: 99%

A Critical Appraisal of the Instrumented Indentation Technique and Profilometry‐Based Inverse Finite Element Method Indentation Plastometry for Obtaining Stress–Strain Curves

Campbell¹,

Zhang

Burley³

et al. 2021

Adv Eng Mater

View full text Add to dashboard Cite

A comparison is presented between conventional tensile stress‐strain curves and those obtained via two methodologies based on (spherical) indentation. The first, termed Instrumented Indentation Technique (IIT), involves conversion of load‐displacement data to stress‐strain curves via analytical expressions. This has been done using loads below 1 N (“nano”) and in the kN range (“macro”). The other procedure, termed profilometry‐based indentation plastometry (PIP), is based on repeated finite element method (FEM) simulation, using the residual indent profile as the target outcome and obtaining the best fit set of parameter values in a constitutive stress‐strain law. This has been done on a macro scale only. The data from nano‐IIT tend to be very noisy and variable, whereas those from macro‐IIT are more reproducible and less noisy. With one of the two empirical formulations employed, the agreement of the macro‐IIT with experiment is close to being acceptable for the work hardening characteristics, although inferred values of the yield stress are in poor agreement with those from tensile testing. In contrast to this, the PIP procedure provides outcomes that are in close agreement with those from tensile testing, concerning both yield stress and work hardening. The causes of this are explored and discussed.

show abstract

Section: Iit Proceduresmentioning

confidence: 99%

A Critical Appraisal of the Instrumented Indentation Technique and Profilometry‐Based Inverse Finite Element Method Indentation Plastometry for Obtaining Stress–Strain Curves

Campbell¹,

Zhang

Burley³

et al. 2021

Adv Eng Mater

View full text Add to dashboard Cite

show abstract

“…As shown, there is very good agreement between the experimental engineering stress-strain curve and the effective (FE) stress-strain curve, whereas deviation is observed at the elastic region and the beginning of the plastic part as shown in the effective stress-strain is obtained by selecting 3.7 for stress constraint factor and 0.11 for strain constraint factor for AISI 1010 and 3.9 and 0.11 for ASTM516-G70. These values are according to published data see these articles for more details [26,29].…”

Section: Model Validationmentioning

confidence: 99%

“…(11) and (12). The stress and strain constraint factor has empirical values according to Taber theory and the type of materials as shown in Table 1 above [29].…”

mentioning

confidence: 99%

Mechanical properties evaluation for engineering materials utilizing instrumented indentation: Finite element modelling approach

Elmisteri

Shuaeib

Midawi

2021

JMES

View full text Add to dashboard Cite

Instrumented indentation technique gives the possibility to determine the mechanical properties for small specimens and material in service. Several researchers have attempted to evaluate this approach experimentally and investigated the factors that affect it by using different indenter’s geometries for different engineering materials. In this work, the instrumented indentation technique was used to evaluate the mechanical properties experimentally and numerically using finite element simulation to understand the contact mechanics between the indenter surface and the substrate for two types of steel alloys namely ASTM516-G70 and AISI1010 steel. Two shapes of indenters, blunt (spherical) and sharp (Vickers) were used. The results were then compared with the experimental results extracted from the instrumented indentation test. The results have demonstrated a good agreement between the experimental and the finite element simulation results with error bound a ±5 % for young’s modulus and ±7.7 % for yield strength. Whereas excellent agreement is observed in the elastic region and the beginning of the plastic region for the true stress-strain curve. Finally, it is to be emphasized that the obtained results are more applicable for the tested materials and further research is recommended to accommodate other materials as well and to confirm the generality of this method.

show abstract

“…These are reviewed in several publications. [1][2][3][4][5] The second is a more rigorous approach, although inevitably more cumbersome. It is based on iterative finite element method (FEM) simulation of the indentation process, systematically changing the values of the parameters in a constitutive plasticity law until optimum agreement is reached between a measured and a modeled outcome-either the load-displacement plot or the residual indent profile.…”

Section: Introduction 1obtaining Stress-strain Curves From Indentation Datamentioning

confidence: 99%

The Effect of Residual Stresses on Stress–Strain Curves Obtained via Profilometry‐Based Inverse Finite Element Method Indentation Plastometry

Burley¹,

Campbell²,

Reiff-Musgrove

et al. 2021

Adv Eng Mater

View full text Add to dashboard Cite

This paper concerns, the effect of (unknown) residual stresses in the near‐surface region of a sample on outcomes of an indentation plastometry technique for obtaining stress–strain relationships, using relatively large spherical indenters. The technique is based on the iterative finite element method (FEM) simulation of indentation, so as to infer the true stress–strain curve of the material (with the target outcome being the profile of the residual indent). It is expected that residual stress levels (if significant compared with the yield stress) are likely to influence the outcome, and indeed this forms the basis of many attempts to measure residual stresses in this way (using a known stress–strain curve). However, there are important issues of sensitivity here, which affect the reliability of such procedures and are also relevant to the accuracy of stress–strain curves inferred from measurements made on samples containing unknown levels of residual stress. Herein, both experimental work on samples with (equal‐biaxial) residual stresses created by the application of external loads and extensive FEM modeling to explore various scenarios are covered. The main conclusion is that the sensitivities involved are in general very low, particularly with relatively deep indentation. Inferred stress–strain curves are thus likely to be quite accurate, even in the presence of relatively high levels of residual stress. Conversely, the measurement of residual stress levels via this procedure is likely to be rather inaccurate, although the reliability is improved using shallow penetration (low ratio of depth‐to‐indenter radius). It is also noted that tensile residual stresses tend to influence outcomes more strongly than compressive ones.

show abstract

Representative Stress-Strain Curve by Spherical Indentation on Elastic-Plastic Materials

Cited by 14 publications

References 47 publications

A Critical Appraisal of the Instrumented Indentation Technique and Profilometry‐Based Inverse Finite Element Method Indentation Plastometry for Obtaining Stress–Strain Curves

A Critical Appraisal of the Instrumented Indentation Technique and Profilometry‐Based Inverse Finite Element Method Indentation Plastometry for Obtaining Stress–Strain Curves

Mechanical properties evaluation for engineering materials utilizing instrumented indentation: Finite element modelling approach

The Effect of Residual Stresses on Stress–Strain Curves Obtained via Profilometry‐Based Inverse Finite Element Method Indentation Plastometry

Contact Info

Product

Resources

About