Forensic Materials Engineering

Lewis, Phil; Reynolds, Ken; Gagg, Colin

doi:10.1201/9780203484531

Cited by 24 publications

(27 citation statements)

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“…7d). However, this study also determined that drill bits produce well-defined toolmarks on swarf as reported by Lewis et al (8) and Reitz (17), which could be identified by an experienced toolmark examiner, even from a perforated hole (Figs. 8a, b, and c).…”

Section: Toolmarkssupporting

confidence: 75%

“…3 illustrates, swarf consists of either continuous chips, commonly known as shavings, or discontinuous chips, commonly known as particles (7). The elemental composition of swarf could be determined through various analytical techniques such as scanning electron microscopy coupled to an energy dispersive X-ray analyzer for quantitative or semi-quantitative analysis (8). Our study showed that the swarf type and size vary for different drilled materials.…”

Section: Morphology Of Swarfmentioning

confidence: 87%

“…In 1998, Jones et al (18) reported on the reproducibility and individuality of toolmarks when compared with consecutively manufactured drill bits. In 2004, Lewis et al (8) reported that a suspect was placed at the crime scene by the matching toolmarks on the copper swarf recovered from the suspect's boots to the toolmarks of a copper swarf recovered from the crime scene. In these instances the results regarding the ability to individualize toolmarks back to the drill bit that produced them were consistent with the earlier findings cited by May, Davis, Miller, and Nichols.…”

Section: Toolmarksmentioning

confidence: 99%

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The Study and Forensic Significance of Drill Bit Use Indicators

Lang¹,

Klees²

2008

Journal of Forensic Sciences

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A case study involving an improvised pipe bomb with a drilled fuse hole is presented. This case study and its accompanying research details drill bit use and/or nonuse indicators. These indicators are then further classified to develop relevant conclusion criteria. These criteria are: (1) trace deposits in the form of particulate and/or smears on the drill bit, especially inside the flute and the tip area, (2) physical damage including chipping, abrasion, and fissuring on the drill bit which mostly occurred on the flute edge bevels and lip edges, and (3) thermal damage. One or any combination of these indicators could be used as effective criteria for concluding drill bit usage. This study also determined that a drill bit produces well-defined toolmarks on swarf shavings that could be identified back to that particular tool, and there is no mechanical break-in period for obtaining reproducible toolmarks on newly manufactured or unused bits.

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Section: Toolmarkssupporting

confidence: 75%

Section: Morphology Of Swarfmentioning

confidence: 87%

Section: Toolmarksmentioning

confidence: 99%

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The Study and Forensic Significance of Drill Bit Use Indicators

Lang¹,

Klees²

2008

Journal of Forensic Sciences

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“…In extractive metallurgy, large billets have to be reduced by mechanical deformation processes such as forging, rolling and extrusion for further reduction and change in their shapes. There are three basic temper-ature ranges in metal forming at which the metal (workpiece) can be formed which are hot working, warm working and cold working [2]. Cold working is a strengthening mechanism that involves plastic deformation.…”

Section: Introductionmentioning

confidence: 99%

“…Worth noting is the fact that cold rolling has enormous benefits in its ability to manufacture products from relatively large pieces of metal at very high speed in a continuous manner exhibiting good surface finish, highly accurate tolerances and stronger products. Addition to these benefits are elimination of shrinkage effect, increased hardness as well as the elastic limit, and decrease in ductility due to strain hardening effect [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Corrosion behaviour of cold‐rolled aluminium AA8015‐alloy in natural seawater at 0.18 μm surface roughness

Olaogun

Akinlabi²,

Arotiba³

2019

Materialwissenschaft Werkst

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Aluminium is one of the most produced and used metals globally, second to ferrous metals. Its good corrosion resistance is one of the reasons for its heavy usage in typical applications, such as in marine applications. Electrochemical corrosion study of cold‐rolled aluminium AA8015‐alloy at 0.18 μm surface roughness in natural seawater was explored. The aluminium AA8015‐alloy utilized in this study was cold rolled in a reversible Achenbach cold rolling mill in four pass schedules to a thickness gauge of 1.2 mm. A surface roughness of 0.18 μm with three cold mounted samples was achieved on an automated grinding/polishing machine using 320 grit, 800 grit, and 1200 grit SiC paper. Electrochemical corrosion experiments were conducted on the samples in natural seawater using a computer‐controlled potentiostat in an open polarization cell set‐up at room temperature. The corrosion behaviour on surface morphologies of the samples was observed by high mega pixel camera and scanning electron microscope. Findings reveal asymmetric polarization curves for all the samples and energy dispersive X‐ray spectrometry elemental analysis shows the existence of insoluble substrate complexes formed on the surfaces. Consequently, the scanning electron microscope analysis confirms localised corrosion in the mode of pitting.

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Forensic Science – Chemistry, Physics, Biology, and Engineering – Introduction

Katz

Halámek

2016

Forensic Science

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Forensic Materials Engineering

Cited by 24 publications

References 0 publications

The Study and Forensic Significance of Drill Bit Use Indicators

The Study and Forensic Significance of Drill Bit Use Indicators

Corrosion behaviour of cold‐rolled aluminium AA8015‐alloy in natural seawater at 0.18 μm surface roughness

Forensic Science – Chemistry, Physics, Biology, and Engineering – Introduction

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