An instrumented indentation technique for estimating fracture toughness of ductile materials: A critical indentation energy model based on continuum damage mechanics

Lee, Jung-Suk; Jang, Jae-il; Lee, Baik-Woo; Choi, Yu-Sung; Lee, Seung Gun; Kwon, Dongil

doi:10.1016/j.actamat.2005.10.033

Cited by 130 publications

(58 citation statements)

References 25 publications

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“…3 IIT has also been applied to evaluate flow properties, [17][18][19][20][21][22][23][24][25][26][27][28][29][30] residual stress, [31][32][33] and fracture toughness. [34][35][36][37] Corrections for imperfect indenter geometry and frame compliance play a critical role in the accuracy of IIT, because the real indenter geometry is not ideal and the measured displacement is not the same as the penetration depth of indenter due to frame compliance when the instruments do not use the surface reference for depth sensor. Oliver and Pharr 3 suggested a general correction method for the imperfect geometry of a sharp Berkovich indenter and frame compliance in which an area function is given by…”

Section: Introductionmentioning

confidence: 99%

Effective indenter radius and frame compliance in instrumented indentation testing using a spherical indenter

et al. 2009

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We introduce a novel method to correct for imperfect indenter geometry and frame compliance in instrumented indentation testing with a spherical indenter. Effective radii were measured directly from residual indentation marks at various contact depths (ratio of contact depth to indenter radius between 0.1 and 0.9) and were determined as a function of contact depth. Frame compliance was found to depend on contact depth especially at small indentation depths, which is successfully explained using the concept of an extended frame boundary. Improved representative stress-strain values as well as hardness and elastic modulus were obtained over the entire contact depth.

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Section: Introductionmentioning

confidence: 99%

Effective indenter radius and frame compliance in instrumented indentation testing using a spherical indenter

et al. 2009

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“…From preliminary finite element simulation it was found that the triaxiality ahead of the indenter tip is in the range 2-3 and that the degree of constraint in the deformed indentation region is similar to that ahead of the crack tip [23]. Hence the indentation energy per unit contact area can be related to w f if there is a characteristic fracture initiation point during the indentation process.…”

Section: Fracture Toughnessmentioning

confidence: 97%

“…And E 0 and E*are the Young's modulus of the undamaged and damaged or effective material respectively. E* can be determined according to the relation proposed by J. S. Lee et.al using critical damage value and void volume fraction [23].…”

Section: Fracture Toughnessmentioning

confidence: 99%

Experimental and numerical study of ball indentation for evaluation of mechanical properties and fracture toughness of structural steel

Ghosh

Tarafder

Sivaprasad

et al. 2010

Trans Indian Inst Met

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Determination of mechanical properties of materials using non-conventional techniques has been an active area of research for a long time. Among various small specimen techniques to determine mechanical properties of materials, the ball indentation technique (BIT) has proved to be advantageous. BIT is used to measure material's mechanical properties including fracture toughness when a tensile test cannot be performed: on welded joints or critical locations of components under service. The present work highlights the applicability of BIT for evaluating flow behaviour of engineering structural steels En24. Standard mechanical properties like ultimate tensile strength, yield stress, strain hardening coefficient evaluated for steels with varying microstructures generated through heat treatment. To determine fracture toughness from the flow behaviour, non linear damage models have been utilized. Using this model, fracture toughness of the En24 steel at different heat treated conditions has been computed using the results generated by the BIT. These results are verified with the already established correlation in literature. Numerical validation of the results generated by the BIT has been carried out by Finite Element Modelling (FEM) using standard ABAQUS software package. The FE model of the BI simulation helps to compute sub indenter stress-strain fields which determine the extent of pile-up in highly ductile materials.

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“…This technique can measure various mechanical properties such as hardness, elastic modulus, tensile properties, residual stress, and fracture toughness by analyzing the indentation loaddepth curve as shown in Fig. 1 (Ahn & Kwon, 2001;Kim, Lee, Lee, & Kwon, 2006;Lee et al, 2006;Lee & Kwon, 2004;Oliver & Pharr, 1992;Suresh & Giannakopoulos, 1998). Indentation testing can be made portable, so that nondestructive, in-situ, on-site testing would be available, with relatively little sample preparation.…”

Section: Introductionmentioning

confidence: 99%

Safety assessment based on mapping of degraded mechanical properties of materials for power plant pipeline using instrumented indentation technique

Lee¹,

Kim²,

Kim³

et al. 2009

Journal of Loss Prevention in the Process Industries

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An instrumented indentation technique for estimating fracture toughness of ductile materials: A critical indentation energy model based on continuum damage mechanics

Cited by 130 publications

References 25 publications

Effective indenter radius and frame compliance in instrumented indentation testing using a spherical indenter

Effective indenter radius and frame compliance in instrumented indentation testing using a spherical indenter

Experimental and numerical study of ball indentation for evaluation of mechanical properties and fracture toughness of structural steel

Safety assessment based on mapping of degraded mechanical properties of materials for power plant pipeline using instrumented indentation technique

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