Prediction of viscoplastic properties of polymeric materials using sharp indentation

Inoue, Noriyuki; Yonezu, Akio; Watanabe, Yousuke; Okamura, Takeo; Yoneda, Koji; Xu, Baoxing

doi:10.1016/j.commatsci.2015.08.033

Cited by 8 publications

(9 citation statements)

References 26 publications

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“…Remarking the wearing influence under test condition, a sharp tip is changed into a round shape with almost 200 nm radius for a brand-new Berkovich indenter. 18 Gerberich et al. 41 have shown that a normal Berkovich indenter may have a tip radius closer to 100–400 nm.…”

Section: Finite Element Simulationmentioning

confidence: 99%

“…13 Although this method is capable of providing unique and robust answers theoretically, it has failed to offer such results practically. Some researchers have made serious efforts to overcome this difficulty by using a variety of indenters and test conditions, 17,18 while some others such as Ma et al. 19 tried to obtain unique results by defining more dimensionless parameters.…”

Section: Introductionmentioning

confidence: 99%

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Implementation of the new minimum resultant error approach to extract elastic-plastic properties of titanium nitride thin film by nanoindentation, finite element analysis, and modified dimensional analysis

Bazzaz

Darvizeh

Alitavoli

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part C:

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Obtaining the plastic properties of thin film coatings has been the main challenge for decades. Implementing the hybrid methods seems to be an applicable way to address this issue. Unfortunately, limitations of nonunique answers together with the need for enormous amount of calculations are counted as the main challenges. To overcome such difficulties, a modified dimensional analysis method is proposed, which is able to reduce the number of dimensionless parameters. Another novel algorithm named “minimum resultant error method” is developed to provide proper criteria to investigate the compliance of the analytical results with empirical data. With this algorithm, yield stress, strain hardening exponent, and strain hardening coefficient are extracted as unique values by using a single indenter nanoindentation results. The simulation results are processed with combined modified dimensional analysis method and minimum resultant error method algorithms. The effects of interlayer, friction coefficient, and indenter tip radius are investigated. Error analysis to the modulus of elasticity is undertaken and the results show less than 2% error for the infimum point, while the individual dimensionless functions errors are below 3.4%. According to the results, this new approach is well-coped with the earlier studies.

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Section: Finite Element Simulationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Implementation of the new minimum resultant error approach to extract elastic-plastic properties of titanium nitride thin film by nanoindentation, finite element analysis, and modified dimensional analysis

Bazzaz

Darvizeh

Alitavoli

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…Thus, strain rate sensitivity is also important to consider when materials are plastically deformed at different velocities during indentation. The strain rate sensitivity can be investigated through a combination of indentation experiments, finite element modeling, and mathematical descriptions 10–15 …”

Section: Introductionmentioning

confidence: 99%

“…Generally, as shown in Figure 1, a complete indentation test consists of the loading, holding and unloading steps. The holding step corresponds to creep deformation, in which the applied load is constant and the displacement increases nonlinearly with holding time, have been widely studied 1–5,14–16,19 . However, the creep and unloading processes can be influenced by the structural relaxation of polymer chains in semi‐crystalline polymers during loading stage.…”

Section: Introductionmentioning

confidence: 99%

“…The holding step corresponds to creep deformation, in which the applied load is constant and the displacement increases nonlinearly with holding time, have been widely studied. [1][2][3][4][5][14][15][16]19 However, the creep and unloading processes can be influenced by the structural relaxation of polymer chains in semi-crystalline polymers during loading stage. The loading procedure and unloading process will exhibit remarkable strain rate sensitivity caused by various loading conditions on the molecular motions of the polymer chains.…”

Section: Introductionmentioning

confidence: 99%

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Rate sensitivity and deformation mechanism of semi‐crystalline polymers during instrumented indentation

Liu

et al. 2021

Journal of Polymer Science

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Instrumented indentation tests using both constant loading rate (CLR) and continuous stiffness measurement (CSM) operation modes were performed to investigate the deformation mechanism and their sensitivity to the deformation rate in semi‐crystalline polymers through the quantitative analysis of load‐depth loading and unloading curves. The strain rate was constant during the CSM tests, while the strain rate decreased with the increasing of loading time in CLR tests. The mechanical response mechanism of the semi‐crystalline polymers to these tests was very complicated because of the combined effects of strain‐hardening in the crystal phase and strain‐softening in the amorphous phase. Results show that the loading index m reflects the strain‐hardening or strain‐softening response during indentation. When m > 2, the mechanical response was due to the strain‐hardening, and when m < 2, the response was due to strain‐softening. A method based on the measured contact hardness was proposed to obtain the unloading stiffness, and the other mechanical parameters could then be determined according to the unloading stiffness.

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Time-dependent Mechanical Response at the Nanoscale

Múnera

Goswami

Martínez

et al. 2020

Mechanics of Materials

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Prediction of viscoplastic properties of polymeric materials using sharp indentation

Cited by 8 publications

References 26 publications

Implementation of the new minimum resultant error approach to extract elastic-plastic properties of titanium nitride thin film by nanoindentation, finite element analysis, and modified dimensional analysis

Implementation of the new minimum resultant error approach to extract elastic-plastic properties of titanium nitride thin film by nanoindentation, finite element analysis, and modified dimensional analysis

Rate sensitivity and deformation mechanism of semi‐crystalline polymers during instrumented indentation

Time-dependent Mechanical Response at the Nanoscale

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