A Joule Heated High-Temperature Tensile Split Hopkinson Pressure Bar
A Joule Heated High-Temperature Tensile Split Hopkinson Pressure Bar
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DOI：
10.1007/s11340-022-00866-2
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发表时间：
2022-06
影响因子：
2.4
通讯作者：
A. Lew;O. Kingstedt
中科院分区：
文献类型：
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作者：
A. Lew;O. Kingstedt
背景极端应用条件通常包括涉及以下因素中的一个或多个的环境：非常高（或低）的温度、辐照、腐蚀性介质暴露、高应力和高应变率加载。由于存在多个因素的复制环境中存在的挑战，实验通常限于研究单一的环境条件。本文概述的努力的目的是证明在张力分离-霍普金森压杆（TSHPB）内精确控制各种金属材料系统的高速率加热，直到其熔化温度的一半。6Al-4V、Inconel 718和镁合金AZ 31 B。所采用的方法集成了占空比控制焦耳加热系统与TSHPB系统。在所需温度高达725 °C的°C范围内），允许在没有直接温度监控的情况下进行测试。焦耳加热系统和TSHPB相结合，提供了一个实验装置，能够应变率高达，加热系统，可以产生电流高达，导致材料特定的加热速率超过。将加热时间限制在几秒钟内限制了微观结构的变化，从而抑制了退火或晶粒生长过程，导致独特的非平衡过热微观结构states.ConclusionThe提出的系统使高温高应变率材料行为的研究成为可能，这与提高对高速加工，锻造，高速车辆碰撞，保护系统对冲击和爆炸的响应，以及核能应用。
BackgroundExtreme application conditions frequently consist of environments involving one or more of the following factors: very high (or low) temperatures, irradiation, corrosive medium exposure, elevated stresses, and high-strain-rate loading. Due to challenges in replicating environments where more than one factor is present, experiments typically are restricted to investigating a single environmental condition.ObjectiveThe objective of the efforts outlined herein is to demonstrate the precisely-controlled high-rate heating of a variety of metallic material systems up to one-half their melting temperature within a Tension Split-Hopkinson Pressure Bar (TSHPB).MethodsSpecific materials investigated include Ti-6Al-4V, Inconel 718, and Magnesium alloy AZ31B. The adopted method integrates a duty-cycle controlled Joule heating system with a TSHPB system.ResultsAccurate and repeatable heating profiles (i.e., within°C of the desired temperature up to 725 °C) allow testing without direct temperature monitoring. Combined, the Joule heating system and TSHPB provide an experimental setup capable of strain-rates up to, a heating system that can produce currents up to, resulting in material-specific heating rates exceeding. Constraining heating times to a few seconds limits microstructural changes, thereby suppressing annealing or grain growth processes, resulting in unique, non-equilibrium superheated microstructure states.ConclusionThe presented system enables the study of elevated temperature high-strain-rate material behavior, which is relevant to improving understanding of material behavior during high-speed machining, forging, high-velocity vehicle crashes, protection system response to impacts and blast, as well as nuclear energy applications.