Analysing the shape memory behaviour of MWCNT-enhanced nanocomposites: a comparative study between experimental and finite element analysis

IF 3.1 Q2 MATERIALS SCIENCE, COMPOSITES

Functional Composites and Structures Pub Date : 2024-05-13 DOI:10.1088/2631-6331/ad45a9

Ritesh Gupta, Gaurav Mittal, Krishna Kumar and Upender Pandel

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引用次数: 0

Abstract

Shape memory polymers (SMPs) are known for their unique ability to withstand large deformations and revert to their original shape under specific external stimuli. However, their broader application in biomedical and structural applications is restricted by limited mechanical and thermal properties. Introducing multi-walled carbon nanotubes (MWCNTs) into SMPs has proven to significantly enhance these characteristics without affecting their inherent shape memory features. This study investigates shape memory nanocomposites (SMNCs) through dynamic and thermogravimetric analyses, along with tensile, flexural, and shape memory testing, and explores fracture interfaces using scanning electron microscopy. Findings indicate optimal shape memory, thermal, and mechanical properties with 0.6 wt% MWCNT content, showcasing a shape recovery ratio of 93.11%, storage modulus of 4127.63 MPa, tensile strength of 55 MPa, and flexural strength of 107.94 MPa. Moreover, incorporating MWCNTs into epoxy demonstrated a reduction in recovery times by up to 50% at 0.6 wt% concentration. Despite a slight decrease in shape fixity ratio from 98.77% to 92.11%, shape recoverability remained nearly consistent across all samples. The study also introduces a novel finite element (FE) method in ABAQUS for modeling the thermomechanical behavior of SMNCs, incorporating viscoelasticity, validated by matching experimental results with FE simulations, highlighting its accuracy and practical applicability in engineering.

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分析 MWCNT 增强纳米复合材料的形状记忆行为：实验与有限元分析的比较研究

众所周知，形状记忆聚合物（SMP）具有独特的能力，能够承受较大的变形，并在特定的外部刺激下恢复到原来的形状。然而，由于机械和热性能有限，它们在生物医学和结构应用领域的广泛应用受到了限制。事实证明，在 SMP 中引入多壁碳纳米管（MWCNTs）可显著增强这些特性，而不会影响其固有的形状记忆特性。本研究通过动态和热重分析以及拉伸、弯曲和形状记忆测试，对形状记忆纳米复合材料（SMNC）进行了研究，并使用扫描电子显微镜对断裂界面进行了探索。研究结果表明，当 MWCNT 含量为 0.6 wt% 时，其形状记忆、热和机械性能均达到最佳状态，形状恢复比为 93.11%，存储模量为 4127.63 兆帕，拉伸强度为 55 兆帕，弯曲强度为 107.94 兆帕。此外，在环氧树脂中加入 0.6 wt% 浓度的 MWCNTs 后，恢复时间最多可缩短 50%。尽管形状固定率从 98.77% 微降至 92.11%，但所有样品的形状可恢复性几乎保持一致。研究还在 ABAQUS 中引入了一种新的有限元（FE）方法，用于模拟 SMNC 的热机械行为，该方法结合了粘弹性，并通过将实验结果与 FE 模拟相匹配进行了验证，突出了其准确性和在工程中的实际应用性。

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

Functional Composites and Structures Materials Science-Materials Science (miscellaneous)

CiteScore

4.80

自引率

10.70%

发文量