Material characterization based on dual indenters

Swaddiwudhipong, S.; Tho, K.K.; Liu, Zishun; Zeng, Kaiyang

doi:10.1016/j.ijsolstr.2004.07.027

Cited by 90 publications

(89 citation statements)

References 19 publications

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“…Chollacoop et al, 11 Dao et al, 12 Tho et al, 60 and Zeng and Chiu 33 have demonstrated the robustness of the solution when the method is based on dual sharp indenters. This method has been used to assess stress strain properties of thin films 61,62 and the properties of the matrix of metal matrix composites. 36 In conical indentation, strain increases continuously with the indentation depth h, and an appropriate equivalent expression is…”

Section: Methods B: Determination Of the Elastic Plastic Propertiesmentioning

confidence: 99%

Determination of plastic properties of metals by instrumented indentation using a stochastic optimization algorithm

et al. 2009

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A novel optimization approach, capable of extracting the mechanical properties of an elasto-plastic material from indentation data, is proposed. Theoretical verification is performed on two simulated configurations. The first is based on the analysis of the load-displacement data and the topography of the residual imprint of a single conical indenter. The second is based on the load-displacement data obtained from two conical indenters with different semi-angles. In both cases, a semi-analytical approach [e.g., Dao et al., Acta Mater. 49, 3899 (2001) and Bucaille et al., Acta Mater. 51, 1663] is used to estimate Young's modulus, yield stress, and strain hardening coefficient from the load-displacement data. An inverse finite element model, based on a commercial solver and a newly developed optimization algorithm based on a robust stochastic methodology, uses these approximate values as starting values to identify parameters with high accuracy. Both configurations use multiple data sets to extract the elastic-plastic material properties; this allows the mechanical properties of materials to be determined in a robust way.

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Section: Methods B: Determination Of the Elastic Plastic Propertiesmentioning

confidence: 99%

Determination of plastic properties of metals by instrumented indentation using a stochastic optimization algorithm

et al. 2009

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“…It was found that the relationship between the load-penetration depth curve and the material properties of elasto-plastic materials is not one-to-one. Unique solution of elasto-plastic material properties can be determined from the load-penetration depth curves of two conical indenters with different apex angles as proposed by Swaddiwudhipong et al [2005]. Nevertheless, a specific set of material properties can lead to a unique load-penetration depth curve.…”

Section: Load-penetration Depth Responsementioning

confidence: 99%

Cooling and Annealing Effect on Indentation Response of Lead-Free Solder

Long

Feng

Yao

2017

Int. J. Appl. Mechanics

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With the development of lead-free solders in the electronic packing industry, Sn-Ag-Cu solders are one of the most promising lead-free alloys to be applied due to their outstanding mechanical property and wettability. By performing indentation experiments, the effect of cooling rate on the mechanical properties of Sn-3.0Ag-0.5Cu (SAC305) solder is investigated in typical cooling conditions (i.e., furnace cooled and water quenched) and compared with the as-machined samples of bulk solder bars from the industry. Based on continuous stiffness measurement technique, Young's modulus and hardness are reduced by 2.3-3.9 GPa and 0.053-0.085 GPa, respectively, after annealing treatment for the indentation depth between 1000 nm and 1100 nm in samples after cooling, however, the value of hardness is independent of cooling condition. By defining the contact stiffness to represent residual stress in solder samples after cooling and annealing process, an exponential-based Oliver-Pharr model is employed to fit the unloading responses of indentation. It is found that the smaller cooling rate induces less contact stiffness and thus less residual stress. Despite different cooling conditions, the contact stiffness of unannealed and annealed solder samples are 711.8-842.5 µN/nm and 655.2-673.4 µN/nm, respectively. Thus, annealing treatment of 210 • C for 6 h can effectively alleviate residual stress to a similar level for SAC305 solder samples with different cooling conditions. This conclusion is supported by the alleviation of pile-up deformation in the residual indentation after annealing treatment.

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“…identical hardness's obtained from different combination of plastic parameters [21][22][23][24], is not observed. Since two thicknesses are used to perform the reverse analysis, the proposed approach likely works as the dual method [16] used for sharp indentation to provide a single combination of appropriate material parameters. It is actually noticed that two different thicknesses provide two different load-indentation depth curves (Fig.…”

Section: Plastic Parametersmentioning

confidence: 99%

“…Two indentation depths corresponding to two different coating thicknesses have been considered instead of the complete load-depth indentation curve related to a single coating thickness. Since two different coating thicknesses are considered for the reverse analysis, the proposed approach likely works as the dual method [16] used for sharp indentation to provide a single combination of appropriate material parameters. This ensures that the relation between material parameters and hardness is one-to-one.…”

Section: Introductionmentioning

confidence: 99%

Finite element modeling of abradable materials – Identification of plastic parameters and issues on minimum hardness against coating's thickness

Peyraut

Seichepine

Coddet

et al. 2008

Int. J. Simul. Multidisci. Des. Optim.

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-Abradable materials are used to decrease the gas consumption of aircraft engines by minimizing the gap between the blade tips and the stator. The key idea consists in using the blades themselves to machine the gap on the abradable coating. The best compromise between soft and hard coating properties has to be reached to avoid blades wear and prevent coating erosion by gas flux and particles. The plastic parameters of abradable coating were identified by using an optimization process directly connected to FEA. The first order optimization method (conjugate gradient strategy + golden section algorithm) was applied to achieve the optimal solution. A good agreement was found between experimental and numerical results. The plastic parameters were used to study the hardness variability of abradable materials with the coating thickness. Surprisingly, a minimum hardness value was found while it was expected that hardness should be always decreasing with thickness. It has been demonstrated that this minimum is produced by the boundary conditions influence on hardness measurement. This research work was completed within the Seal-Coat project funded by the European Commission under the FP5 Growth Program.

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Material characterization based on dual indenters

Cited by 90 publications

References 19 publications

Determination of plastic properties of metals by instrumented indentation using a stochastic optimization algorithm

Determination of plastic properties of metals by instrumented indentation using a stochastic optimization algorithm

Cooling and Annealing Effect on Indentation Response of Lead-Free Solder

Finite element modeling of abradable materials – Identification of plastic parameters and issues on minimum hardness against coating's thickness

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