Determining elastic–plastic properties from indentation data obtained from finite element simulations and experimental results

Kang, JiJun; Becker, A.A.; Sun, Wei

doi:10.1016/j.ijmecsci.2012.05.011

Cited by 78 publications

(45 citation statements)

References 25 publications

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“…A variant of the inverse analysis technique employs the theory of optimization to find the set of material properties that minimizes the error between an experimental, or theoretical experimental, and a predicted P-h curve (e.g. [22,23]). …”

Section: Introductionmentioning

confidence: 99%

Characterization of material property variation across an inertia friction welded CrMoV steel component using the inverse analysis of nanoindentation data

Iracheta

Bennett

Sun

2016

International Journal of Mechanical Sciences

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In this study, a new application of the inverse analysis of the depth-sensing indentation technique based on the optimization theory has been satisfactorily demonstrated. The novel approach for determining the mechanical properties from experimental nanoindentation curves has been applied in order to generate the elastic-plastic stress-strain curves of three phases located across the joint of a like-to-like inertia friction weld of a CrMoV steel, i.e. the parent phase of tempered martensite and two child phases formed during the IFW process, martensite in the quenched and over-tempered condition. The inverse analysis carried out in this study consists of an optimization algorithm implemented in MATLAB, which compares an experimental nanoindentation curve with a predicted indentation curve generated by a 3D 2 finite element model developed using the ABAQUS software; the optimization algorithm modifies the predicted curve by changing the material properties until the best fit to the experimental nanoindentation curve is found. The optimized parameters (mechanical properties) have been used to generate the stress-strain relationships in the elastic-plastic regime that can be used to simulate numerically the effects of the variation in material properties arising from phase transformations occurring across the joint during the IFW process of a CrMoV steel.The proposed inverse analysis was capable of fitting experimental load-depth (P-h) curves produced with a Nanoindentation Nanotest NTX unit from three characteristic regions located across the joint where the above mentioned phases are known to exist. The capability of the inverse analysis to build the stress-strain relationship in the elastic-plastic regime using the optimized mechanical properties of the parent metal has been validated using experimental data extracted from the compressive test of an axisymmetric sample of tempered martensite [1]. According to previous experimental studies, the presence of martensite in the quenched and over-tempered condition formed during the IFW of shaft sections of CrMoV steel are responsible of the 1.52:1 harder and 0.75:1 softer regions, compared to the region where the tempered martensite is located [2][3][4]. These ratios are in very good agreement with the optimized magnitudes of yield stress provided by the inverse analysis, that is, 1.54:1 for the quenched martensite and 0.68:1 for the over-tempered martensite, compared to the optimized value of yield stress of the tempered martensite.Moreover, a relative difference of less than 1.5% between the experimental and predicted maximum depth (h max ) supports the capability of the method for extracting the elastic-plastic mechanical properties defining each of the indented regions.3

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Section: Introductionmentioning

confidence: 99%

Characterization of material property variation across an inertia friction welded CrMoV steel component using the inverse analysis of nanoindentation data

Iracheta

Bennett

Sun

2016

International Journal of Mechanical Sciences

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“…The mechanical properties of the indented material, such as elastic modulus E, yield strength σ y , strain hardening exponent n, and hardness H, can thus be evaluated from these above indentation parameters. Numerous analytical approaches that allow the determining of the mechanical properties from the indentation load-penetration depth curve have been proposed in recent years [17][18][19][20][21]. Among which Oliver and Pharr's method [17] has been considered as one of the most popular methods to extract elastic modulus and hardness of indented material, while the algorithm proposed by Pham et al [21] could be considered as a representative approach for determination of yield strength and The mechanical properties of the indented material, such as elastic modulus E, yield strength y, strain hardening exponent n, and hardness H, can thus be evaluated from these above indentation parameters.…”

Section: Methodsmentioning

confidence: 99%

Indentation for investigation of strain rate effect on mechanical properties in structural steel weld zone

Pham

Vinh

Tung

2019

STCE

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In this study, instrumented indentation testing was conducted at room temperature for the investigation of the effect of strain rate on the hardness and yield strength in the weld zone of a commonly used structural steel, SM520. A number of indentation tests were undertaken at a number of strain rate values from 0.02 s −1 to 0.2 s −1 in the weld metal (WM), heat-affected zone (HAZ), and base metal (BM) regions of the weld zone. The mechanical properties including yield strength (σ y ) and hardness (H) in WM, HAZ, and BM were then computed from the applied load-penetration depth curves using a proposed method. As the result, the effects of strain rate indentation on yield strength and hardness in all regions of the weld zone were evaluated. The results displayed that hardness and yield strength in the weld zone's components are influenced on the strain rate, where both hardness and yield strength decrease with the decreasing strain rate.

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“…A previous study [8] has shown that Berkovich and Vickers indenters displace more volume and thereby produce greater local stresses due to fact that the contact areas between the indenters and the bulk materials are larger than in the case of conical indenters. Despite these differences, conical indenters have the advantage of possessing axial symmetry and equivalent projected areas of contact can be used between conical and pyramid-shaped indenters such as Berkovich and Vickers indenters.…”

Section: Optimization Approach Using a Conical Indentermentioning

confidence: 95%

“…This method involves the determination of the mechanical properties of the surface of a given material from loading-unloading curves obtained from micro-or nano-indentation tests, based on the assumption that the material behaves in an elastic-plastic response during the loading phase and the unloading behaviour of the indenter is fully elastic with no plastic deformation [1]. Various approaches have been proposed using dimensionless analysis and numerical optimisation to extract material properties of power law materials with good estimations [2][3][4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Determination of elastic and viscoplastic material properties obtained from indentation tests using a combined finite element analysis and optimization approach

Kang

Becker

Sun

2013

Proceedings of the Institution of Mechanical Engineers, Part L:

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A note on versions:The version presented here may differ from the published version or from the version of record. If you wish to cite this item you are advised to consult the publisher's version. Please see the repository url above for details on accessing the published version and note that access may require a subscription. Kang, J..J., Becker, A.A. and Sun, W.," Determination of elastic and viscoplastic material properties obtained from indentation tests using a combined finite element analysis and optimization approach", Proc. IMechE, Part L:

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Determining elastic–plastic properties from indentation data obtained from finite element simulations and experimental results

Cited by 78 publications

References 25 publications

Characterization of material property variation across an inertia friction welded CrMoV steel component using the inverse analysis of nanoindentation data

Characterization of material property variation across an inertia friction welded CrMoV steel component using the inverse analysis of nanoindentation data

Indentation for investigation of strain rate effect on mechanical properties in structural steel weld zone

Determination of elastic and viscoplastic material properties obtained from indentation tests using a combined finite element analysis and optimization approach

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