Microtopography for ductile fracture process characterization

Lloyd, W.R.

doi:10.1016/s0013-7944(02)00126-1

Cited by 23 publications

(11 citation statements)

References 1 publication

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“…By this method (see [45][46]) the fracture surfaces are topographically analyzed post-mortem. It is based on the assumption that the CTOA is preserved in the plastic deformations of the fracture surface.…”

Section: (B) Microtopographymentioning

confidence: 99%

Fracture and damage mechanics modelling of thin-walled structures – An overview

Zerbst¹,

Heinimann

Donne³

et al. 2009

Engineering Fracture Mechanics

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Section: (B) Microtopographymentioning

confidence: 99%

Fracture and damage mechanics modelling of thin-walled structures – An overview

Zerbst¹,

Heinimann

Donne³

et al. 2009

Engineering Fracture Mechanics

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“…However, the FRASTA application has previously focused on smaller size scales and localized behaviors [9]. At the same time, only a few fracture parameters were determined by FRASTA.…”

Section: Development Of Quantitative Fracture Surface Analysis By Frastamentioning

confidence: 99%

A novel method for failure analysis based on three-dimensional analysis of fracture surfaces

Cao

Nie

et al. 2014

Engineering Failure Analysis

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“…Lloyd provides data collection and methodology fundamentals of microtopography in the companion article [9]. In that article, the author demonstrates that deformation associated with ductile fracture occurs predominantly within the fracture process zone surrounding the crack tip.…”

Section: Ctoa Analysis By Microtopographymentioning

confidence: 99%

Microtopography for ductile fracture process characterization Part 2: application for CTOA analysis

Lloyd

McClintock

2003

Engineering Fracture Mechanics

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The crack tip opening angle (CTOA) is seeing increased use to characterize fracture in so-called "low constraint" geometries, such as thin sheet aerospace structures and thin-walled pipes. With this increase in application comes a need to more fully understand and measure actual CTOA behavior. CTOA is a measure of the material response during ductile fracture, a "crack tip response function." In some range of crack extension following growth initiation, a constant value of CTOA is often assumed. However, many questions concerning the use of CTOA as a material response-characterizing parameter remain. For example, when is CTOA truly constant? What three-dimensional effects may be involved (even in thin sheet material)? What are the effects of crack tunneling on general CTOA behavior? How do laboratory specimen measurements of CTOA compare to actual structural behavior?Measurements of CTOA on the outer surface of test specimens reveal little about threedimensional effects in the specimen interior, and the actual measurements themselves are frequently difficult. The Idaho National Engineering and Environmental Laboratory (INEEL) use their microtopography system to collect data from the actual fracture surfaces following a test. Analyses of these data provide full three-dimensional CTOA distributions, at any amount of crack extension. The analysis is accomplished using only a single specimen and is performed entirely after the completion of a test. The resultant CTOA distributions allow development of full and effective understanding of CTOA behaviors. This paper presents underlying principles, various sources of measurement error and their corrections, and experimental and analytical verification of CTOA analysis with the microtopography method.

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Microtopography for ductile fracture process characterization

Cited by 23 publications

References 1 publication

Fracture and damage mechanics modelling of thin-walled structures – An overview

Fracture and damage mechanics modelling of thin-walled structures – An overview

A novel method for failure analysis based on three-dimensional analysis of fracture surfaces

Microtopography for ductile fracture process characterization Part 2: application for CTOA analysis

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