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Special Issue "Dynamic Behavior of Advanced Materials and Structures"

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A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Mechanics of Materials".

Deadline for manuscript submissions: 10 May 2024 | Viewed by 2341

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Special Issue Editors

Prof. Dr. Weidong Song

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Guest Editor

School of Mechatronical Engineering, Beijing Institute of Technology, Beijing 100081, China
Interests: impact dynamics; impact protection; additive manufacturing; mechanics of composites; energy absorption structures; computational mechanics

Dr. Lijun Xiao
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Guest Editor

School of Mechatronical Engineering, Beijing Institute of Technology, Beijing 100081, China
Interests: impact dynamics; mechanical metamaterials; additive manufacturing; impact protection

Dr. Xianfeng Yang
E-Mail Website
Guest Editor

School of Aeronautic Science and Engineering, Beihang University, Beijing 100191, China
Interests: impact dynamics; mechanical metamaterials; energy absorption structures; impact protection

Special Issue Information

Dear Colleagues,

The dynamic behavior of materials and structures is a vibrant branch of mechanics and materials science that has important application background in aerospace, traffic engineering and many other industry fields. With the rapid development of manufacturing technology in recent years, a series of advanced materials and structures with excellent properties have emerged, and their nonlinear mechanical behavior as well as multi-scale failure mechanism under impact loads have attracted extensive attention.

The scope of this Special Issue includes theoretical, numerical and experimental research on the dynamic mechanical behavior of additively manufactured metamaterials, high-entropy alloys, amorphous alloys as well as some other advanced engineering materials and structures within a wide range of strain rates. The Issue’s scope also includes investigations on the multiscale design for protective properties of materials and structures under intense loading.

Prof. Dr. Weidong Song
Dr. Lijun Xiao
Dr. Xianfeng Yang
Guest Editors

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Keywords

impact dynamics
analytical methods
dynamic tests
numerical simulation
molecular dynamics
additive manufacturing

Published Papers (4 papers)

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Research

25 pages, 20564 KiB

Open AccessArticle

Coupled Modal Analysis and Aerodynamics of Rotating Composite Beam

Grzegorz Stachyra

Lukasz Kloda

and

Zofia Szmit

Materials 2023, 16(23), 7356; https://doi.org/10.3390/ma16237356 - 26 Nov 2023

Viewed by 336

Abstract

This study primarily focuses on conducting, both experimentally and numerically, a modal analysis of a cantilever composite beam. Through extended numerical simulations, we investigate Campbell diagrams, which, depending on the rotation speed of the structure, comprise natural frequencies and their corresponding modal shapes. Our results are categorized into two main aspects: the classical single-mode behavior and an innovative extension involving linearly coupled modal analysis. One key novelty of our research lies in the introduction of an analytical description for coupled mode shapes, which encompass various deformations, including bending, longitudinal deformations, and twisting. The most pronounced activation of dynamic couplings within the linear regime for a

45^{\circ}

preset angle is observed, though the same is not true of the

0^{\circ}

and

90^{\circ}

preset angles, for which these couplings are not visible. In addition to the modal analysis, our secondary goal is to assess the lift, drag forces, and moment characteristics of a rectangular profile in uniform flow. We provide insights into both the static and dynamic aerodynamic responses experienced by the beam within an operational frequency spectrum. This study contributes to a deeper understanding of the dynamics of composite rotating beams and their aerodynamic characteristics. Full article

(This article belongs to the Special Issue Dynamic Behavior of Advanced Materials and Structures)

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22 pages, 8858 KiB

Open AccessArticle

Delamination Behavior of CFRP Laminated Plates under the Combination of Tensile Preloading and Impact Loading

Kaiwei Lan

Haodong Wang

and

Cunxian Wang

Materials 2023, 16(19), 6595; https://doi.org/10.3390/ma16196595 - 08 Oct 2023

Viewed by 482

Abstract

When subjected to impact loading, aircraft composite structures are usually in a specific preloading condition (such as tension and compression). In this study, ballistic tests were conducted using a high-speed gas gun system to investigate the effect of biaxial in-plane tensile preload on the delamination of CFRP laminates during high-speed impact. These tests covered central and near-edge locations for both unloaded and preloaded targets, with the test speeds including 50 m/s, 70 m/s, and 90 m/s. The delamination areas, when impacting the center location under 1000 με, show a 14.2~36.7% decrease. However, the cases when impacting the near-edge location show no more than a 19.3% decrease, and even more delamination areas were observed. In addition, in order to enhance the understanding of experimental phenomena, numerical simulations were conducted using the ABAQUS/Explicit solver, combined with the user subroutine VUMAT with modified Hou criteria. The experimental and simulation results were in good agreement, and the maximum error was approximately 12.9%. The results showed that not only the preloading value but also the impact velocity have significant influences on the delamination behavior of preloaded CFRP laminated plates. Combining detailed discussions, the biaxial tensile preload enhanced the resistance to out-of-plane displacement and caused laminate interface stiffness degradation. By analyzing the influence of the preloading value and impact velocity on competing mechanisms between the stress-stiffening effect and interface stiffness degradation effect, the complex delamination behaviors of laminates under various preloading degrees and impact velocities at different impact locations were reasonably explained. Full article

(This article belongs to the Special Issue Dynamic Behavior of Advanced Materials and Structures)

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12 pages, 3738 KiB

Open AccessArticle

Dynamic Characteristic Analysis of a Toothed Electromagnetic Spring Based on the Improved Bouc—Wen Model

and

Materials 2023, 16(13), 4889; https://doi.org/10.3390/ma16134889 - 07 Jul 2023

Viewed by 594

Abstract

Electromagnetic spring active isolators have attracted extensive attention in recent years. The standard Bouc–Wen model is widely used to describe hysteretic behavior but cannot accurately describe asymmetric behavior. The standard Bouc–Wen model is improved to better describe the dynamic characteristic of a toothed electromagnetic spring. The hysteresis model of toothed electromagnetic spring is established by adding mass, damping, and asymmetric correction terms with direction. Subsequently, the particle swarm optimization algorithm is used to identify the parameters of the established model, and the results are compared with those obtained from the experiment. The results show that the current has a significant impact on the dynamic curve. When the current increases from 0.5 A to 2.0 A, the electromagnetic force sharply increases from 49 N to 534 N. Under different excitations and currents, the residual points predicted by the model proposed in this work fall basically in the horizontal band region of −20–20 N (for an applied current of 1.0 A) and −40–80 N (for an application of 4.5 mm/s). Furthermore, the maximum relative error of the model is 12.75%. The R² of the model is higher than 0.98 and the highest value is 0.9993, proving the accuracy of the established model. Full article

(This article belongs to the Special Issue Dynamic Behavior of Advanced Materials and Structures)

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17 pages, 10482 KiB

Open AccessArticle

Investigation on Vibration Characteristics of Thin-Walled Steel Structures under Shock Waves

and

Materials 2023, 16(13), 4748; https://doi.org/10.3390/ma16134748 - 30 Jun 2023

Viewed by 537

Abstract

Thin-walled steel structures, prized for their lightweight properties, material efficiency, and excellent mechanical characteristics, find wide-ranging applications in ships, aircraft, and vehicles. Given their typical role in various types of equipment, it is crucial to investigate the response of thin-walled structures to shock waves for the design and development of innovative equipment. In this study, a shock tube was employed to generate shock waves, and a rectangular steel plate with dimensions of 2400.0 mm × 1200.0 mm × 4.0 mm (length × width × thickness) was designed for conducting research on transient shock vibration. The steel plate was mounted on an adjustable bracket capable of moving vertically. Accelerometers were installed on the transverse and longitudinal symmetric axes of the steel plate. Transient shock loading was achieved at nine discrete positions on a steel plate by adjusting the horizontal position of the shock tube and the vertical position of the adjustable bracket. For each test, vibration data of eight different test positions were obtained. The wavelet transform (WT) and the improved ensemble empirical mode decomposition (EEMD) methods were introduced to perform a time-frequency analysis on the vibration of the steel plate. The results indicated that the EEMD method effectively alleviated the modal aliasing in the vibration response decomposition of thin-walled structures, as well as the incompletely continuous frequency domain issue in WT. Moreover, the duration of vibration at different frequencies and the variation of amplitude size with time under various shock conditions were determined for thin-walled structures. These findings offer valuable insights for the design and development of vehicles with enhanced resistance to shock wave loading. Full article

(This article belongs to the Special Issue Dynamic Behavior of Advanced Materials and Structures)

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Special Issue "Dynamic Behavior of Advanced Materials and Structures"

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