Royal Military Academy (RMA), Avenue de la Renaissance 30, 1000 Brussels, Belgium; Université de Lille, Unité de Mécanique de Lille, Avenue Paul Langevin, 59655 Villeneuve d'Ascq, France.
Royal Military Academy (RMA), Avenue de la Renaissance 30, 1000 Brussels, Belgium.
Forensic Sci Int. 2020 May;310:110238. doi: 10.1016/j.forsciint.2020.110238. Epub 2020 Mar 7.
Plastilina is often used as a ballistic witness material (BWM) behind the armour to evaluate the backface signature (BFS). Indeed, it is cheap, reusable and it keeps its deformation after being impacted. Moreover, while it aims at evaluating the performance of ballistic protections when no perforation occurs, it can be subjected to a very wide range of strain/shear rates during a ballistic impact. Therefore, there is a need to improve the knowledge about the mechanical/rheological response of such a material. This paper proposes both experimental and modelling approaches to determine the response of the specific ballistic plastilina red Weible® over a wide range of shear/strain rate. A capillary rheometry analysis with control of temperature was performed up to 8.10 s. The corrections of Rabinowitsch and Bagley were applied and an attempt of the analysis of Mooney was considered. From the rheology of plasticine, a two-parameters based power-law constitutive equation was deduced. An experimental drop test was carried out using a specific standard setup. A high-speed camera was used for measuring the penetration depth of a steel ball into the plastilina. A numerical simulation of the drop test was performed by taking into account the mechanical properties of the plastilina. A good correlation was observed between the experimental and numerical results in terms of indentation depth evolution.
橡皮泥通常被用作装甲后面的弹道见证材料（BWM），以评估背面痕迹（BFS）。事实上，它便宜、可重复使用，并且在受到冲击后仍能保持变形。此外，虽然它旨在评估弹道防护装置在不穿孔的情况下的性能，但在弹道冲击过程中，它可能会经历非常广泛的应变/剪切速率。因此，需要提高对这种材料的机械/流变响应的认识。本文提出了实验和建模方法，以确定特定的弹道橡皮泥红 Weible®在广泛的剪切/应变率范围内的响应。在控制温度的条件下进行了毛细管流变分析，直到 8.10 s。应用了 Rabinowitsch 和 Bagley 的修正，并考虑了 Mooney 分析的尝试。从塑性流变学的角度出发，推导出了一个基于两个参数的幂律本构方程。使用特定的标准设置进行了落锤试验。使用高速摄像机测量钢球进入橡皮泥的穿透深度。通过考虑橡皮泥的机械性能，对落锤试验进行了数值模拟。在压痕深度演化方面，观察到实验结果和数值结果之间具有良好的相关性。
