Photochromic webbing structures for monitoring UV-induced mechanical strength degradation

IF 3.7 3区 材料科学 Q1 INSTRUMENTS & INSTRUMENTATION Smart Materials and Structures Pub Date : 2024-09-02 DOI:10.1088/1361-665x/ad717a
Sina Kazemipour, Osgar John Ohanian III, Maurizio Porfiri, Peng Zhang
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Abstract

Webbing structures are critical load-bearing components in a wide array of applications from structural restraint layers in inflatable space habitats to safety harness belts used by construction workers. In the field, webbings are subjected to ultraviolet (UV) irradiation from sunlight, leading to material degradation and a loss of mechanical strength. To date, health monitoring of webbings has relied on empirically correlating UV-induced strength loss with variations in their inherent color, which often yields inconsistent and imprecise results. To fill this gap, we propose a novel class of photochromic webbing structures that afford noninvasive monitoring of UV-induced degradation of their mechanical strength. The webbings’ sensing capabilities are achieved by integrating a class of photochromic yarns, fabricated through a pressurized coating process. Under continuous UV irradiation, the proposed photochromic webbings exhibit a substantial color change, demonstrating a sensing lifetime equivalent to several months in field conditions. We establish a strong correlation between the webbings’ photochromic response and their strength loss, supporting the feasibility of the proposed webbings in monitoring their mechanical integrity. To elucidate the sensing mechanism, we propose a physics-based mathematical model that describes the underlying photochemical reactions. Through an asymptotic analysis, we demonstrate that the model accurately predicts the webbing’s long-term photochromic responses under extended UV irradiation. The proposed photochromic webbing structures and the predictive mathematical model could enhance the safety and integrity of webbing-based engineering systems.
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用于监测紫外线引起的机械强度退化的光致变色织带结构
从充气太空舱的结构约束层到建筑工人使用的安全带,织带结构是各种应用中的关键承重部件。在野外,织带会受到阳光中紫外线(UV)的照射,导致材料降解和机械强度下降。迄今为止,织带的健康监测一直依赖于根据经验将紫外线引起的强度损失与织带固有颜色的变化联系起来,这往往会产生不一致和不精确的结果。为了填补这一空白,我们提出了一类新型光致变色织带结构,可对紫外线引起的机械强度下降进行无创监测。这种织带的传感功能是通过整合一类光致变色纱线实现的,纱线是通过加压涂层工艺制作的。在紫外线的持续照射下,拟议的光致变色织带会发生显著的颜色变化,在现场条件下的传感寿命相当于几个月。我们在网带的光致变色响应与其强度损失之间建立了紧密的相关性,从而证明了拟议网带在监测其机械完整性方面的可行性。为了阐明传感机制,我们提出了一个基于物理学的数学模型,用于描述基本的光化学反应。通过渐近分析,我们证明该模型可以准确预测织带在紫外线长期照射下的长期光致变色反应。建议的光致变色织带结构和预测性数学模型可以提高基于织带的工程系统的安全性和完整性。
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来源期刊
Smart Materials and Structures
Smart Materials and Structures 工程技术-材料科学:综合
CiteScore
7.50
自引率
12.20%
发文量
317
审稿时长
3 months
期刊介绍: Smart Materials and Structures (SMS) is a multi-disciplinary engineering journal that explores the creation and utilization of novel forms of transduction. It is a leading journal in the area of smart materials and structures, publishing the most important results from different regions of the world, largely from Asia, Europe and North America. The results may be as disparate as the development of new materials and active composite systems, derived using theoretical predictions to complex structural systems, which generate new capabilities by incorporating enabling new smart material transducers. The theoretical predictions are usually accompanied with experimental verification, characterizing the performance of new structures and devices. These systems are examined from the nanoscale to the macroscopic. SMS has a Board of Associate Editors who are specialists in a multitude of areas, ensuring that reviews are fast, fair and performed by experts in all sub-disciplines of smart materials, systems and structures. A smart material is defined as any material that is capable of being controlled such that its response and properties change under a stimulus. A smart structure or system is capable of reacting to stimuli or the environment in a prescribed manner. SMS is committed to understanding, expanding and dissemination of knowledge in this subject matter.
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