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The Dynamics of Blood Drop Release from Swinging Objects in the Creation of Cast-off Bloodstain Patterns

Elisabeth Williams Orcid Logo, Emma S. Graham, Mark C. Jermy, David C. Kieser, Michael C. Taylor

Journal of Forensic Sciences

Swansea University Author: Elisabeth Williams Orcid Logo

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DOI (Published version): 10.1111/1556-4029.13855

Abstract

Although the characteristics of cast‐off bloodstain patterns are well known, the physics of the mechanism by which they are created is poorly understood. The aim of this work was to describe the process by which blood droplets disengage from swinging objects. Cast‐off droplets were recorded using hi...

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Published in: Journal of Forensic Sciences
ISSN: 00221198
Published: 2018
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URI: https://cronfa.swan.ac.uk/Record/cronfa40975
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first_indexed 2018-07-12T13:35:53Z
last_indexed 2018-09-17T18:55:54Z
id cronfa40975
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spelling 2018-09-17T13:56:35.2694178 v2 40975 2018-07-12 The Dynamics of Blood Drop Release from Swinging Objects in the Creation of Cast-off Bloodstain Patterns 2c5b3af00392058866bfd4af84bef390 0000-0002-8422-5842 Elisabeth Williams Elisabeth Williams true false 2018-07-12 STSC Although the characteristics of cast‐off bloodstain patterns are well known, the physics of the mechanism by which they are created is poorly understood. The aim of this work was to describe the process by which blood droplets disengage from swinging objects. Cast‐off droplets were recorded using high‐speed digital video photography, and the resulting cast‐off patterns were analyzed to draw inferences about the trajectories of individual drops. Blood on the object's distal end formed ligaments, which subsequently disintegrated into droplets. Initial droplet trajectories were approximately tangential to the trajectory of the location on the object from which the droplet was released. The application of the laws of physics to the mechanism of cast‐off is discussed, and the process of drop formation is compared to that of passive drop formation. A technical description of cast‐off is proposed, and a diagram to aid investigators in interpreting cast‐off patterns at crime scenes is offered. Journal Article Journal of Forensic Sciences 00221198 forensic science, bloodstain pattern analysis, cast‐off patterns, biomechanics, fluid dynamics 31 12 2018 2018-12-31 10.1111/1556-4029.13855 COLLEGE NANME Sport and Exercise Sciences COLLEGE CODE STSC Swansea University 2018-09-17T13:56:35.2694178 2018-07-12T08:38:18.1175642 Faculty of Science and Engineering School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Sport and Exercise Sciences Elisabeth Williams 0000-0002-8422-5842 1 Emma S. Graham 2 Mark C. Jermy 3 David C. Kieser 4 Michael C. Taylor 5 0040975-13072018092208.pdf Williams2018(4).pdf 2018-07-13T09:22:08.9100000 Output 462687 application/pdf Accepted Manuscript true 2019-07-05T00:00:00.0000000 true eng
title The Dynamics of Blood Drop Release from Swinging Objects in the Creation of Cast-off Bloodstain Patterns
spellingShingle The Dynamics of Blood Drop Release from Swinging Objects in the Creation of Cast-off Bloodstain Patterns
Elisabeth Williams
title_short The Dynamics of Blood Drop Release from Swinging Objects in the Creation of Cast-off Bloodstain Patterns
title_full The Dynamics of Blood Drop Release from Swinging Objects in the Creation of Cast-off Bloodstain Patterns
title_fullStr The Dynamics of Blood Drop Release from Swinging Objects in the Creation of Cast-off Bloodstain Patterns
title_full_unstemmed The Dynamics of Blood Drop Release from Swinging Objects in the Creation of Cast-off Bloodstain Patterns
title_sort The Dynamics of Blood Drop Release from Swinging Objects in the Creation of Cast-off Bloodstain Patterns
author_id_str_mv 2c5b3af00392058866bfd4af84bef390
author_id_fullname_str_mv 2c5b3af00392058866bfd4af84bef390_***_Elisabeth Williams
author Elisabeth Williams
author2 Elisabeth Williams
Emma S. Graham
Mark C. Jermy
David C. Kieser
Michael C. Taylor
format Journal article
container_title Journal of Forensic Sciences
publishDate 2018
institution Swansea University
issn 00221198
doi_str_mv 10.1111/1556-4029.13855
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Sport and Exercise Sciences{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Sport and Exercise Sciences
document_store_str 1
active_str 0
description Although the characteristics of cast‐off bloodstain patterns are well known, the physics of the mechanism by which they are created is poorly understood. The aim of this work was to describe the process by which blood droplets disengage from swinging objects. Cast‐off droplets were recorded using high‐speed digital video photography, and the resulting cast‐off patterns were analyzed to draw inferences about the trajectories of individual drops. Blood on the object's distal end formed ligaments, which subsequently disintegrated into droplets. Initial droplet trajectories were approximately tangential to the trajectory of the location on the object from which the droplet was released. The application of the laws of physics to the mechanism of cast‐off is discussed, and the process of drop formation is compared to that of passive drop formation. A technical description of cast‐off is proposed, and a diagram to aid investigators in interpreting cast‐off patterns at crime scenes is offered.
published_date 2018-12-31T03:52:12Z
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score 11.036706

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