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首页> 外文期刊>Journal of Materials Engineering and Performance >Experimental Characterization and Material-Model Development for Microphase-Segregated Polyurea: An Overview
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Experimental Characterization and Material-Model Development for Microphase-Segregated Polyurea: An Overview

机译：微相分离聚脲的实验表征和材料模型开发：概述

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摘要

Numerous experimental investigations reported in the open literature over the past decade have clearly demonstrated that the use of polyurea external coatings and/or inner layers can substantially enhance both the blast resistance (the ability to withstand shock loading) and the ballistic performance (the ability to defeat various high-velocity projectiles such as bullets, fragments, shrapnel, etc. without penetration, excessive deflection or spalling) of buildings, vehicles, combat-helmets, etc. It is also well established that the observed high-performance of polyurea is closely related to its highly complex submicron scale phase-segregated microstructure and the associated microscale phenomena and processes (e.g., viscous energy dissipation at the internal phase boundaries). As higher and higher demands are placed on blast/ballistic survivability of the foregoing structures, a need for the use of the appropriate transient nonlinear dynamics computational analyses and the corresponding design-optimization methods has become ever apparent. A critical aspect of the tools used in these analyses and methods is the availability of an appropriate physically based, high-fidelity material model for polyurea. There are presently several public domain and highly diverse material models for polyurea. In the present work, an attempt is made to critically assess these models as well as the experimental methods and results used in the process of their formulation. Since these models are developed for use in the high-rate loading regime, they are employed in the present work, to generate the appropriate shock-Hugoniot relations. These relations are subsequently compared with their experimental counterparts in order to assess the fidelity of these models.
机译：在过去的十年中，公开文献中进行的大量实验研究清楚地表明，使用聚脲外涂层和/或内层可以显着增强抗爆炸性（承受冲击载荷的能力）和防弹性能（抗冲击能力）。击败各种高速弹丸，例如子弹，碎片，弹片等，而不会穿透建筑物，车辆，战斗头盔等的穿透，过度挠曲或剥落。也已很好地证明，所观察到的高性能聚脲非常接近与高度复杂的亚微米级相分离微观结构以及相关的微观现象和过程（例如，内部相界处的粘性能量耗散）有关。随着对前述结构的爆炸/弹道生存能力提出越来越高的要求，使用适当的瞬态非线性动力学计算分析和相应的设计优化方法的需求已变得显而易见。这些分析和方法中使用的工具的一个关键方面是，是否有合适的基于物理的，高保真度的聚脲材料模型。当前，聚脲有几种公共领域和高度多样化的材料模型。在当前的工作中，试图批判性地评估这些模型以及其制备过程中使用的实验方法和结果。由于这些模型是为在高负荷状态下使用而开发的，因此将它们用于当前工作中，以生成适当的激波-休格尼奥特关系。随后将这些关系与它们的实验对应关系进行比较，以评估这些模型的保真度。

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