从准静态到动态:环氧树脂机械和断裂行为的实验研究

IF 5.1 2区 工程技术 Q1 ENGINEERING, MECHANICAL
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引用次数: 0

摘要

环氧聚合物广泛应用于航空航天、国防、体育、汽车等各种工程领域。本文重点介绍 EPOFINE®-1564(一种基于双酚 A 的液态环氧树脂)在各种负载条件下的深入机械特性。为了预测具有代表性的环氧树脂的拉伸和压缩行为,在万能试验机(UTM)上进行了 10-4 到 10-2 s-1 范围内的准静态实验,而在高应变率(1136-2833 s-1)条件下,使用分体式霍普金森压力棒(SHPB)进行了动态实验。本研究还使用三维数字图像相关(DIC)来评估试样在各种应变速率下的全场位移曲线。对弹性模量、屈服强度和极限强度等各种机械性能的分析表明,环氧聚合物在所考虑的应变速率范围内与应变速率有关。为了解断裂行为,还进行了准静态(1-10 毫米/分钟)和动态(10-15 米/秒-1)三点弯曲(TPB)实验。使用改良霍普金森压力棒(MHPB)进行了动态断裂实验。断裂韧性是通过载荷与裂口张开位移(CMOD)来确定的。由于在准静态范围内存在显著的塑性变形,断裂韧性随位移速率的增加而增加。相反,在动态载荷下,由于没有塑性变形而导致脆性断裂,因此断裂韧性降低。通过高倍数码显微镜对试样的断裂表面进行了检测。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
From quasi-static to dynamic: Experimental study of mechanical and fracture behaviour of epoxy resin

Epoxy polymers are extensively used in various engineering applications such as aerospace, defence, sports, automotive etc. This article focuses on the in-depth mechanical characterisation of EPOFINE®-1564, a Bisphenol-A-based liquid epoxy resin under various loading conditions. To predict the tensile and compressive behaviour of the representative epoxy resin, quasi-static experiments were performed in the range of 10−4 to 10−2 s−1 on Universal testing machine (UTM) while the dynamic experiments were conducted using Split Hopkinson Pressure Bar (SHPB) for high strain rates (1136–2833 s−1). In this study, 3D Digital Image Correlation (DIC) was also used to evaluate the specimen's full-field displacement profile over a wide range of strain rates. Analysis of various mechanical properties such as elastic modulus, yield strength, and ultimate strength, revealed that the epoxy polymer is strain rate dependent within the considered strain rate range. For understanding the fracture behaviour, three-point bend (TPB) experiments were also carried out for both quasi-static (1–10 mm/min) as well as dynamic (10–15 m s-1) regimes. Dynamic fracture experiments were performed using the modified Hopkinson Pressure Bar (MHPB). The fracture toughness was determined through load vs crack mouth opening displacement (CMOD). Fracture toughness was found to increase with the displacement rate due to the significant plastic deformation under quasi-static range. Conversely, it was found to decrease under dynamic loading because of absence of plastic deformation resulting in brittle fracture. The fracture surface of the specimen was examined through a high magnification digital microscope.

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来源期刊
International Journal of Impact Engineering
International Journal of Impact Engineering 工程技术-工程:机械
CiteScore
8.70
自引率
13.70%
发文量
241
审稿时长
52 days
期刊介绍: The International Journal of Impact Engineering, established in 1983 publishes original research findings related to the response of structures, components and materials subjected to impact, blast and high-rate loading. Areas relevant to the journal encompass the following general topics and those associated with them: -Behaviour and failure of structures and materials under impact and blast loading -Systems for protection and absorption of impact and blast loading -Terminal ballistics -Dynamic behaviour and failure of materials including plasticity and fracture -Stress waves -Structural crashworthiness -High-rate mechanical and forming processes -Impact, blast and high-rate loading/measurement techniques and their applications
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