An analysis of load–penetration curves from instrumented indentation

Zeng, Kaiyang; Chiu, Chiao-Fan

doi:10.1016/s1359-6454(01)00245-2

Cited by 158 publications

(151 citation statements)

References 25 publications

Supporting

Mentioning

132

Contrasting

Unclassified

Order By: Relevance

“…Devido à sua versatilidade, numerosos trabalhos têm sido desenvolvidos neste campo, estudando-se novas metodologias e aplicações para estes ensaios. Recentes propostas utilizam estes ensaios como uma ferramenta capaz de avaliar características mecânicas dos materiais além da dureza superficial como, por exemplo, o módulo de elasticidade (E), o coeficiente de Poisson (ν), a tenacidade à fratura (K IC ) e uma curva de tensão em função da deformação do comportamento elastoplástico [1,2].…”

Section: Introductionunclassified

Estudo numérico da influência do coeficiente de atrito no ensaio de indentação em filmes finos

Araújo

Dias²,

Godoy³

2013

Matéria (Rio J.)

View full text Add to dashboard Cite

A demanda por componentes mais resistentes ao desgaste e à corrosão tem promovido um interesse crescente da engenharia de superfícies que desenvolve processos para melhoria das propriedades tribológicas de materiais. O uso de revestimentos cerâmicos tem sido uma opção utilizada para melhorar estas propriedades mecânicas superficiais. Contudo se faz necessário o desenvolvimento de ensaios para avaliação do comportamento mecânico do filme e da sua interface com o substrato, o que requer equipamentos sofisticados, mão de obra especializada, acarretando altos custos operacionais. Com o avanço dos sistemas computacionais, a utilização da análise numérica para solucionar inúmeros problemas tecnológicos tem sido cada vez mais frequente e atualmente permite a sua implementação a baixos custos de processo. Neste trabalho, propõe-se a utilização do Método dos Elementos Finitos, através de um software comercial, para simular o ensaio de indentação com penetradores esféricos em conjugados compostos de substrato metálico e filme cerâmico com diferentes espessuras. Porém a utilização de técnica numérica para avaliar o ensaio de indentação em recobrimentos superficiais finos também tem apresentado desafios, principalmente na obtenção do comportamento mecânico do conjugado. Para melhor representar o ensaio de indentação foram considerados o efeito do coeficiente de atrito entre o penetrador e o recobrimento para, em seguida, serem analisados os campos de tensões e de deformações no conjugado para diferentes profundidades de penetração.Palavras chaves: Ensaio de Dureza, Filmes Finos, Elementos Finitos, Coeficiente de Atrito. ABSTRACTThe demand for components more resistant to wear and corrosion has promoted a growing interest in the surface engineering that develops processes to improve the tribological properties of materials. The use of ceramic coating has been an option used to improve the surface of mechanical properties. However, it is necessary to use tests to evaluate the mechanical behavior of the film and its interface with the substrate, which requires sophisticated equipment, skilled labor and consequently expensive cost. As computer systems have been improving recently, the use of numerical analysis to solve many technological problems has been increasingly frequent and current. Consequently, it allows its implementation with a low cost. This paper proposes to use the Finite Element Method (FEM) to simulate the indentation test with spherical indenters in conjugated compounds of metal substrate and ceramic film with different thicknesses, using commercial software. However, the use of this numerical technique to evaluate the indentation testing also has had problems in obtaining the mechanical properties of the conjugate. In this work, the numerical model also includes the effects of friction between the penetrator and the film to analyze the fields of stresses and strains along the different penetration depths.

show abstract

Section: Introductionunclassified

Estudo numérico da influência do coeficiente de atrito no ensaio de indentação em filmes finos

Araújo

Dias²,

Godoy³

2013

Matéria (Rio J.)

View full text Add to dashboard Cite

show abstract

“…Therefore, a lot of studies concerned with the evaluation of E and H of bulk materials and thin films by nanoindenter have been reported in recent years. [3][4][5] The micro-Vickers hardness, Hv, which represents the reliable hardness of metals and ceramic materials determined in the micro-scale regime, is one of the most widely used hardness standards. Therefore, comparison with the hardness data obtained by micro-Vickers tests and nano-indentation tests has significant importance, because when a clear relationship between both hardness values is developed, the nanoindentation tests can provide a hardness evaluation that is compatible to micro-Vickers hardness, on nanoscale-size phases.…”

Section: Introductionmentioning

confidence: 99%

Evaluation Technique of the Hardness and Elastic Modulus of Materials with Fine Microstructures

2003

View full text Add to dashboard Cite

Quantitative data of mechanical properties such as hardness, H, and elastic modulus, E, are required for the constituent phases of an alloy in the process of alloy design. To meet the needs, the evaluation technique of H and E of phases in composites through nanoindentation tests is proposed. Moreover, H and E of Nb solid solution (Nb SS ) and niobium silicide (Nb 5 Si 3 ) phases in Nb-base in-situ composites were characterized by the proposed method. To clarify the quantitative relationship between the nanohardness, Hn, and the micro-Vickers hardness, Hv, nanoindentation tests were carried out on the Hv Standard blocks with Hv100, 500, 700, 900 and 1600, under a wide range of applied loads from 0.1 to 40 mN. As a result, it was clarified that Hv and Hn are linearly related under each applied load. Therefore, Hv could be estimated from Hn by applying the linear relation. It was also confirmed that the elastic modulus is almost independent of the applied loads. Therefore, the elastic modulus, E, could also be directly estimated by nanoindentation tests with Poisson's ratios of tested materials. Hv and E of Nb SS and Nb 5 Si 3 in the Nb-base composites determined by the method show good agreement with the reported values for both phases. Accordingly, it is possible to conclude that the proposed method is useful to quantitatively evaluate the hardness and elastic modulus of constituent phases in a composite.

show abstract

“…Actually, in whole test results, the main interesting features could be concluded as two typical nanoindentations: (1) Their hardness and modulus go up quickly while depth at 10-50nm or <100nm, then go down slowly and get to a constant at 100-300nm; their hardness at unloading is about 22-26 GPa, and their Young's modulus about 360-420GPa(see Table2, Finally, Table 3 gave hardness and Young's modulus for homogeneous materials measured via nanoindentation [5,6]. Compared with those in A1 2 0 3 , SiC and Zr0 2 , the current results of hardness and Young's modulus, got from each component in heterogeneous composite, are reasonable.…”

Section: Discussionmentioning

confidence: 99%

Nano-microscale Characterizations to Al2O3/SiCnano Ceramic Composites

Zhong¹

2002

International Journal of Nonlinear Sciences and Numerical Simulation

View full text Add to dashboard Cite

In this paper, the principle physical properties, Young's modulus and hardness at very small volume, are measured via nanoindentation for one typical nano-ceramics composite. The Young's modulus and hardness presented in this paper are dependent obviously on components or microstructures of the current material while penetration is at 10~100nm. With the penetration getting deeper, the final magnitude of the modulus seems to be a certain one for the composite. Compared with the modulus, the hardness seems to be more sensitive to the penetration depth. Microscopic observations are also performed under optical microscopics to make sure that, at very tiny volume, the nanoindentations could be local at components of the composite and the final results obtained from nanoindentation tests.

show abstract

An analysis of load–penetration curves from instrumented indentation

Cited by 158 publications

References 25 publications

Estudo numérico da influência do coeficiente de atrito no ensaio de indentação em filmes finos

Estudo numérico da influência do coeficiente de atrito no ensaio de indentação em filmes finos

Evaluation Technique of the Hardness and Elastic Modulus of Materials with Fine Microstructures

Nano-microscale Characterizations to Al2O3/SiCnano Ceramic Composites

Contact Info

Product

Resources

About