Material Characterization for Mechanical Behavior Predictions of Composite Materials and Structures

A special issue of Processes (ISSN 2227-9717). This special issue belongs to the section "Materials Processes".

Deadline for manuscript submissions: 15 July 2024 | Viewed by 1514

Special Issue Editor


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Guest Editor
Mechanical Engineering Department, National Yang Ming Chiao Tung University, Hsin Chu 300, Taiwan
Interests: reliability engineering; mechanics of composite materials structures; fracture mechanics; experimental mechanics; optimal design
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Special Issue Information

The mechanical behavior of a structure is a useful measure of structural health and even the reliability of the structure. Therefore, determining the actual mechanical behavior of structures has long been an important topic of research. Composite materials have been produced using different processing techniques for fabricating various composite structures/microelectromechanical systems (MEMSs) in aerospace, marine, automotive, defense, wind power, and sensor industries, among others. The material properties of composite materials produced using different process techniques may be different. Therefore, for quality assurance, the material properties of composite materials used to fabricate composite structures/MEMSs must be accurately determined to ensure that the mechanical behaviors of composite structures/MEMS can meet functionality as well as reliability requirements. On the other hand, as time goes by, degraded composite materials will affect the mechanical behaviors of composite structures/MEMSs. As far as the reliability or structural health monitoring of an existing composite structure is concerned, it is essential to identify the current material constants and predict the actual mechanical behaviors of the structure. The aim of this Special Issue is to encourage researchers to publish the state-of-the-art, experimental, and/or theoretical methods that can determine the actual material constants of different types of composite materials and/or predict the actual mechanical behaviors of composite structures/MEMSs.

Prof. Dr. Tai-Yan Kam
Guest Editor

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Keywords

  • mechanical behavior
  • composite structures
  • microelectromechanical systems (MEMSs)
  • actual material constants
  • composite materials

Published Papers (1 paper)

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Research

14 pages, 5220 KiB  
Article
Preparation and Mechanical Properties of PBAT/Silanized Cellulose Composites
by Xiangyun Wang, Wenlong Mo, Yongming Zeng and Jide Wang
Processes 2024, 12(4), 722; https://doi.org/10.3390/pr12040722 - 2 Apr 2024
Viewed by 609
Abstract
Polybutylene adipate-terephthalate (PBAT) is a fully biodegradable polyester, which has been proven to be the most suitable alternative to traditional plastics. However, due to the low strength of PBAT (17.2 MPa) and high price, the use of PBAT has a degree of limitations. [...] Read more.
Polybutylene adipate-terephthalate (PBAT) is a fully biodegradable polyester, which has been proven to be the most suitable alternative to traditional plastics. However, due to the low strength of PBAT (17.2 MPa) and high price, the use of PBAT has a degree of limitations. To obtain a cost-effective and high-performance composite material of PBAT, for this study we selected microcrystalline cellulose, which is inexpensive and easily available, as the reinforcing medium. However, due to the hydrophobicity of PBAT, the mechanical properties of PBAT when mixed with hydrophilic cellulose were low. In order to improve the compatibility of cellulose and PBAT, this study selected hexadecyltrimethoxysilane (HDTMS) containing long carbon chains to silanize microcrystalline cellulose (MCC) to obtain silanized cellulose (SG). Three types of SGs with different degrees of silanization were obtained by controlling HDTMS with different mass ratios (1:10; 3:10; 5:10) to react with MCC. Characterization of these three types of SGs was conducted using FTIR, TEM, and water absorption analysis. The results demonstrated the successful synthesis of SG. With the increase in the reaction ratio of HDTMS and MCC, the size of the nanoparticles increases, and the water absorption decreases significantly. Subsequently, PBAT/SG composites were prepared by blending three kinds of silanized cellulose with PBAT in different proportions by the sol-gel method. To study the thermal stability and compatibility, the mechanical properties of the composites were evaluated, including thermogravimetric testing, scanning analysis, and dynamic thermomechanical testing. The optimal blending ratio and the optimal type of silane cellulose were found. Analysis of the mechanical properties revealed that the tensile strength initially increased and then decreased with increasing blending ratio for all three composites tested. Among them, the PBAT/SG2 composites exhibit superior performance, with a maximum tensile strength reaching 22 MPa at an 85/15 blending ratio, nearly 30% higher than that of pure PBAT alone. The addition of SG significantly improved the strength of the PBAT, and SG2 is more suitable for preparing high-strength composite materials. In addition, after the addition of SG, the yield stress of the composite is improved while maintaining good thermal stability. Both the SEM and DMA results indicated good compatibility of the PBAT/SG composites. This study provides a new idea for the industrial-scale development of degradable polyesters with low cost and good mechanical properties. Full article
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