Spallation of polycarbonate on nanosecond timescales.

IF 2.2 3区 物理与天体物理 Q2 PHYSICS, FLUIDS & PLASMAS
Jacob M Diamond, K T Ramesh
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引用次数: 0

Abstract

Polycarbonate is commonly used in extreme environments, particularly in applications involving high-velocity impact. A critical failure mode in high-velocity impact is that of spallation, where intersecting release waves result in the dynamic fracture of the material under high-rate tension. Despite the ubiquity of polycarbonate, major gaps exist in our understanding of its behavior at high rates over very short timescales. Here we investigate the spallation of polycarbonate on nanosecond timescales at strain rates of ∼10^{6}s^{-1} through a data set of 117 spall experiments. The size and fidelity of our dataset allow us to calculate fundamental uncertainties associated with the spallation of polycarbonate. Compared to lower rate experiments, we observe higher spall strengths, a higher spall initiation threshold, and a more gradual decrease in spall strength with increasing prior shock stress. This paper provides a strong basis for future computational model development and brings up questions on the underlying mechanisms that control spallation in polymers at extreme strain rates.

聚碳酸酯在纳秒级时间尺度上的剥落。
聚碳酸酯通常用于极端环境,特别是涉及高速冲击的应用。高速冲击中的一种临界破坏模式是剥落,其中相交的释放波导致材料在高速率张力下发生动态断裂。尽管聚碳酸酯无处不在,但我们对其在极短时间内的高速率行为的理解仍存在重大差距。在这里,我们通过117个碎片实验的数据集研究了在应变速率为~ 10^{6}s^{-1}的纳秒时间尺度上聚碳酸酯的碎片。我们的数据集的大小和保真度使我们能够计算与聚碳酸酯碎裂相关的基本不确定性。与低速率实验相比,我们观察到更高的小颗粒强度,更高的小颗粒起裂阈值,并且随着先前冲击应力的增加,小颗粒强度的下降更加缓慢。本文为未来计算模型的发展提供了坚实的基础,并提出了在极端应变速率下控制聚合物剥落的潜在机制的问题。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Physical Review E
Physical Review E PHYSICS, FLUIDS & PLASMASPHYSICS, MATHEMAT-PHYSICS, MATHEMATICAL
CiteScore
4.50
自引率
16.70%
发文量
2110
期刊介绍: Physical Review E (PRE), broad and interdisciplinary in scope, focuses on collective phenomena of many-body systems, with statistical physics and nonlinear dynamics as the central themes of the journal. Physical Review E publishes recent developments in biological and soft matter physics including granular materials, colloids, complex fluids, liquid crystals, and polymers. The journal covers fluid dynamics and plasma physics and includes sections on computational and interdisciplinary physics, for example, complex networks.
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