Experimental investigation of void coalescence in metallic sheets containing laser drilled holes

Weck, Arnaud; Wilkinson, David S.

doi:10.1016/j.actamat.2007.12.035

Cited by 158 publications

(63 citation statements)

References 29 publications

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“…Recent experimental studies have focused on topics like the interaction of an array of premachined holes. [15,16] These new experimental observations have allowed Xue [17] to formulate a modified constitutive failure model that takes into account both void growth/coalescence and void shearing. Modern characterization tools and experimental techniques could permit a more comprehensive understanding of the ductile failure process in metals.…”

Section: Introductionmentioning

confidence: 99%

The Morphology of Tensile Failure in Tantalum

Boyce

Clark

et al. 2013

Metall Mater Trans A

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The deformation, crack nucleation, coalescence, and rupture process of pure tantalum (99.9 pct) were studied under room temperature quasistatic loading using several in situ and ex-situ techniques including optical metallography, scanning electron microscopy (SEM), electron backscatter diffraction (EBSD), and transmission-electron microscopy (TEM). The fracture surface of tantalum forms a ridge-and-valley morphology that is distinct from conventional notions of ductile dimple microvoid coalescence, and also distinct from spall damage formed during dynamic shock conditions. Failure proceeds by void nucleation at a dislocation cell wall or in subgrain interiors. Coalescence appears to involve a two-stage damage progression: first individual voids coalesce along the tensile axis forming diamond-shaped multivoid cavities; then cavities link-up by intercavity necking. Final rupture occurs when the intercavity necks thin tõ 100-nm films and fail by crystallographic cleavage. This final tearing process was observed using in situ TEM tensile deformation of a thin tantalum film. The detailed microstructural and morphological observations of the current study can be used to guide the development of improved models for tearing of ductile metals.

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Section: Introductionmentioning

confidence: 99%

The Morphology of Tensile Failure in Tantalum

Boyce

Clark

et al. 2013

Metall Mater Trans A

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“…It should be noted here that the experimental results which are presented in detail elsewhere (Week and Wilkinson 2008) also demonstrate the difficulty in experimentally capturing the onset of coalescence in terms of a strong mode of localization in the ligament between the voids. For example coalescence is often defined to commence when voids start to grow laterally towards their neighbors.…”

Section: Introductionmentioning

confidence: 93%

“…However, it is important to demonstrate their ability to simulate accurately the whole damage process. This is the main objective of the current investigation which relies on recent experimental results from tensile tests using model materials in which different void populations were artificially drilled in sheet samples using a femtosecond laser system (Week and Wilkinson 2008). These holes provide a precisely controlled population of artificial primary voids, so that the experiments enable us to capture the details of the void growth and their linkage in well defined configurations, and provide quantitative information which can be used to validate the simulations.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulations of void linkage in model materials using a nonlocal ductile damage approximation

et al. 2007

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Experiments on the growth and linkage of 10 urn diameter holes laser drilled in high precision patterns into Al-plates were modelled with finite elements. The simulations used geometries identical to those of the experiments and incorporated ductile damage by element removal under the control of a ductile damage indicator based on the micromechanical studies of Rice and Tracey. A regularization of the problem was achieved through an integral-type nonlocal model based on the smoothing of the rate of a damage indicator D over a characteristic length L. The

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“…Furthermore, the ductile shear fracture surface consists of fine, closely-spaced dimples which are much wider than they are deep, see Garrison Jr and Moody (1987). Weck and Wilkinson (2008) studied the fracture characteristics of specimens with laser-drilled holes in different orientations. They concluded that when the holes are located parallel to the loading direction, coalescence occurred by internal necking of the ligaments between the holes.…”

Section: Introductionmentioning

confidence: 99%

Failure characteristics of a dual-phase steel sheet

Björklund

Nilsson

2014

Journal of Materials Processing Technology

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Failure in ductile sheet metal structures is usually caused by one, or a combination of, ductile tensile fractures, ductile shear fractures or localised instability. In this paper the failure characteristics of the high strength steel Docol 600DP are explored. The study includes both experimental and numerical sections. In the experimental sections, the fracture surface of the sheet subjected to Nakajima tests is studied under the microscope with the aim of finding which failure mechanism causes the fracture. In the numerical sections, finite element (FE) simulations have been conducted using solid elements. From these simulations, local stresses and strains have been extracted and analysed with the aim of identifying the fracture dependency of the stress triaxiality and Lode parameter.

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Experimental investigation of void coalescence in metallic sheets containing laser drilled holes

Cited by 158 publications

References 29 publications

The Morphology of Tensile Failure in Tantalum

The Morphology of Tensile Failure in Tantalum

Numerical simulations of void linkage in model materials using a nonlocal ductile damage approximation

Failure characteristics of a dual-phase steel sheet

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