Elastic characterization of nanometer-thick polymeric film for astrophysics application with an experimental-numerical method

IF 1.7 3区 工程技术 Q2 ENGINEERING, AEROSPACE Journal of Astronomical Telescopes Instruments and Systems Pub Date : 2023-07-01 DOI:10.1117/1.JATIS.9.3.034005
N. Montinaro, U. Lo Cicero, F. D'anca, E. Bozzo, S. Paltani, M. Barbera
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Abstract

Abstract. The x-ray detectors on board astrophysics space missions require optical blocking filters that are highly transparent to x-rays. The filter design typically consists of a polymeric film that is a few tens of nanometers thick coated with aluminium. Due to the large size of the filter membrane (from a few tens to a few hundred square centimeters) and the extreme aspect ratio, together with severe loading conditions during launch and different stoichiometries of the polymer that could change its mechanical properties, a characterization study of the employed material is needed. The plane strain bulge test is a well-accepted methodology for the mechanical testing of structures that are less than a micrometer thick, and especially for freestanding membranes. Unfortunately, testing such ultra-thin films is not a simple task due to residual stress and experimental uncertainty at very low pressure. In this work, the elastic properties of an extremely thin (between 45 and 415 nm) membrane made of bare polyimide and coated with aluminium were derived through adopting a combined experimental-numerical methodology based on the bulge test and numerical simulations.
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应用于天体物理学的纳米厚聚合物薄膜弹性特性的实验-数值方法
摘要天体物理学太空任务中的x射线探测器需要对x射线高度透明的光学阻挡滤光片。过滤器的设计通常由一层几十纳米厚的聚合物薄膜组成,薄膜上涂有铝。由于过滤膜的尺寸很大(从几十平方厘米到几百平方厘米)和极端的宽高比,再加上发射时的严重负载条件和聚合物的不同化学计量,可能会改变其机械性能,因此需要对所使用的材料进行表征研究。平面应变膨胀试验是一种被广泛接受的方法,用于小于一微米厚的结构的力学测试,特别是对于独立膜。不幸的是,由于在非常低的压力下存在残余应力和实验不确定性,测试这种超薄薄膜并不是一项简单的任务。在这项工作中,通过采用基于膨胀试验和数值模拟的实验-数值相结合的方法,推导了由裸聚酰亚胺制成并涂有铝的极薄(45至415nm)膜的弹性性能。
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来源期刊
CiteScore
4.40
自引率
13.00%
发文量
119
期刊介绍: The Journal of Astronomical Telescopes, Instruments, and Systems publishes peer-reviewed papers reporting on original research in the development, testing, and application of telescopes, instrumentation, techniques, and systems for ground- and space-based astronomy.
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