School of Mechanical & Materials Engineering, University College Dublin, Belfield, Dublin 4, Ireland.
Forensic Sci Int. 2013 Dec 10;233(1-3):7-13. doi: 10.1016/j.forsciint.2013.08.011. Epub 2013 Aug 19.
The magnitude of force used in a stabbing incident can be difficult to quantify, although the estimate given by forensic pathologists is often seen as 'critical' evidence in medico-legal situations. The main objective of this study is to develop a quantitative measure of the force associated with a knife stabbing biological tissue, using a combined experimental and numerical technique. A series of stab-penetration tests were performed to quantify the force required for a blade to penetrate skin at various speeds and using different 'sharp' instruments. A computational model of blade penetration was developed using ABAQUS/EXPLICIT, a non-linear finite element analysis (FEA) commercial package. This model, which incorporated element deletion along with a suitable failure criterion, is capable of systematically quantifying the effect of the many variables affecting a stab event. This quantitative data could, in time, lead to the development of a predictive model that could help indicate the level of force used in a particular stabbing incident.
刺击事件中使用的力的大小很难量化，尽管法医学家给出的估计在医学-法律情况下通常被视为“关键”证据。本研究的主要目的是使用组合实验和数值技术，开发一种与刀刺生物组织相关的力的定量测量方法。进行了一系列刺透试验，以量化在不同速度下使用不同“锋利”工具刺穿皮肤所需的力。使用非线性有限元分析 (FEA) 商业软件包 ABAQUS/EXPLICIT 开发了一个刀片穿透的计算模型。该模型结合了元素删除和合适的失效准则，能够系统地量化影响刺击事件的许多变量的影响。这些定量数据最终可能会开发出一种预测模型，有助于指示特定刺击事件中使用的力的水平。
