Advanced dynamic characterization and orthotropic FEM of hybrid carbon-fiber metal-matrix composite spur gears with damping sensitive resonance analysis
Aug 2026· Journal of Materials Science: Materials in Engineering· 0 citations
Abstract
Spur gears are particularly vulnerable to vibration-induced resonance, noise production, dynamic stress concentration, and early fatigue failure while running at high speeds and under cyclic loading circumstances. The dynamic performance of conventional steel gears in sophisticated transmission systems is limited by their weak intrinsic damping capability, despite their high strength and wear resistance. This work uses advanced finite element modal and harmonic response analysis to examine the dynamic behavior and vibration attenuation properties of hybrid carbon-fiber-reinforced metal matrix composite (MMC) spur gears. Six material configurations were compared, including carbon-fiber/epoxy composite, stainless-steel-reinforced hybrids (CF/Epoxy/SS316 and CF/Epoxy/SS304), aluminum-reinforced hybrids (CF/Epoxy/Al6082 and CF/Epoxy/Al1050), and SCM420H steel. Equivalent orthotropic elastic formulations obtained using rule-of-mixtures homogenization were used to represent the composite materials. Mesh-independent models with realistic elastic support and frictional contact boundary conditions were used in ANSYS Workbench 2023 R1 for finite element simulations. The Block Lanczos solver was used for modal analysis in order to obtain natural frequencies and mode shapes. Harmonic response analysis was then used to assess resonance characteristics. Rayleigh damping implementation and characterization based on Dynamic Mechanical Analysis (DMA) were used to incorporate damping features. The findings show that, in comparison to traditional steel gears, all hybrid composites have noticeably higher natural frequencies and better damping characteristics. Because of its greater specific stiffness, Composite A (80% carbon fiber + 20% epoxy resin) showed the largest natural frequency range of 47.1–56.3 kHz. The optimum balance between lightweight properties, rigidity, and vibration attenuation was demonstrated by hybrid composites reinforced with aluminum. In comparison to steel gears, Composite C2 (CF/Epoxy/Al1050) achieved the highest damping ratio (ζ = 0.08) and lowered resonant amplitudes by around 40%. Additionally, a nearly 30% decrease in root fillet stress concentration was found by dynamic stress analysis, suggesting enhanced fatigue resistance and crack suppression capacity. Aluminum-based hybrids perform better because of their reduced density, better stiffness-to-weight ratio, less rotational inertia, and increased interfacial energy dissipation. The promise of hybrid carbon-fiber metal matrix composites for lightweight, vibration-resistant, and resonance-safe spur gear applications in cutting-edge automotive and industrial transmission systems is demonstrated by the developed orthotropic finite element framework.
Advanced thermoset composite materials are widely used due to their high specific strength, corrosion resistance, good fatigue life, light-weight nature, and design flexibility; however, they exhibit limitations such as poor recyclability, weak out-of-plane strength, and low damping capacity. Since mechanical vibrations lead to energy loss, fatigue failure, and noise, materials with enhanced damping properties are required for vibration control applications. In this study, pure thermoplastic polyurethane (TPU) and aluminum powder-filled TPU composites (1,2,5, and 10 wt%) were fabricated using injection molding for tensile and free vibration analysis. The first three natural frequencies were evaluated theoretically using Euler-Bernoulli beam theory, numerically via ANSYS following ASTM E756 standards, and experimentally through impact hammer testing using an ACC 103 accelerometer sensor. Mechanical properties were determined using tensile testing, while dynamic responses were analyzed in terms of natural frequencies and damping ratios. The results indicate that natural frequencies are directly dependent on elastic modulus, while the aluminum filler in the corporation reduces natural frequencies and significantly improves damping performance. SEM analysis revealed that filler dispersion, agglomeration, and interfacial adhesion strongly affect both mechanical and dynamic properties. The maximum damping ratio of 2.44 was achieved for 10 wt% aluminum-filled TPU with 65% improvement compared to pure TPU, demonstrating its potential for applications such as sandwich composite cores, vibration isolation systems, and structures requiring effective vibration suppression.
Aschalew Belete Alemu, Y. J. Mamo· Journal of Thermoplastic Com...· 0 citations
The present work investigates the dynamic response of Carbon Fiber Reinforced Epoxy Reinforced Aluminum 2024‐T3 FML with a 2/1 stacking arrangement subjected to low velocity impacts. Low velocity impact tests were conducted by drop weight impact tests using hemispherical impactor at an impact energy range of 60–120 J. Hybrid finite element modeling of the laminate in Abaqus Explicit is carried out using 3D solid elements for the aluminum plates and shell elements for the composite layer. The Johnson Cook damage criteria for aluminum layers and Hashin damage criteria for the composite layer are used in the modeling procedure. Good correlation between the experimental and numerical results for forces, energy, and displacement time histories with a relative error in energy absorption of less than 3%, peak force of 5%, and maximum displacement of 7% is achieved. The progressive failure mechanisms such as metal dents, tearing, matrix cracking, fiber breaking, and delamination are accurately simulated. Area of damage analysis reveals that the damage progression is in the form of cone spreading from impact face to distal face.
Mehmet İskender Özsoy, Ender Can Yakar, Sinan Fidan et al.· Polymer Composites· 0 citations
To address fatigue failure, weld cracking and resonance in steel-frame pedestals caused by mechanical vibration, this study proposes a composite steel frame fabricated by integrating concave hexagonal negative-Poisson’s-ratio honeycomb structures with I-shaped steel, aiming to achieve the integrated structural function of load bearing and vibration damping. Bending and vibration tests are carried out on both conventional and composite steel frames to compare their static load-bearing characteristics and dynamic vibration-damping effects. Meanwhile, a finite-element model is established based on the Abaqus software platform to explore the regulation mechanism of honeycomb geometric parameters on the composite frame’s performance. Results show the composite frame realises ‘load-bearing–vibration-damping’ synergy, with yield strength basically consistent with conventional frames and excellent low-frequency vibration energy dissipation capacity. Honeycomb arrangement position and cell thickness mainly regulate load-bearing performance, while layer number and cell thickness have a significant impact on damping. After parameter optimisation, the maximum vibration level difference of the composite frame peaks at 62.81 dB, providing new design ideas and technical support for steel frame performance optimisation under low-frequency vibration environments.
Shuang Guo, Yajun Zhao· Proceedings of the Instituti...· 0 citations
In the automotive sector, the demand for composite materials within suspension systems increases day by day, as it has an advantageous combination of stiffness and low density, superior damping characteristics, and enhanced resistance to both corrosion and fatigue. This study investigates the vibrational characteristics of a mono composite leaf spring made by using Glass Fiber Reinforced Polymer (GFRP), which is the best substitute for a conventional steel leaf spring in light-duty commercial vehicles. The GFRP mono composite leaf spring, consisting optimum volume of a 60% E-glass fiber and a 40% epoxy matrix, and it was fabricated using the hand lay-up process. After that, it underwent experimental testing to determine its static Stiffness, natural frequency, and also the transmissibility. Assessment of static Stiffness was done by employing a Universal Testing Machine (UTM). Furthermore, a natural frequency characteristic was analysed by utilizing a Fast Fourier Transform (FFT) analyser, and to determine the transmissibility, a bespoke harmonic excitation system incorporating a cam–follower mechanism was utilized. The investigation reveals that the GFRP mono composite leaf spring exhibits a rigidity that is 44.14% superior, a mass reduction is 57.93%, and a natural frequency that is 49.91% elevated if compared to the steel leaf spring. Transmissibility at various frequencies indicated a substantial attenuation in transmitted vibration up to 60.60% in the GFRP mono composite leaf spring when compared with the traditional steel leaf spring. This study reveals that the GFRP mono composite leaf spring is very highly effective in vibration isolation. Consequently, the results conclude that the implementation of GFRP leaf springs in automotive applications will enhance ride comfort, reduce the chance of resonance, and improves dynamic stability.
Subhash Khamkar, K. Ojha· International Journal of Mec...· 0 citations
Accurately predicting the mechanical response and failure of composite–metal hybrid bolted joints under thermo-mechanical coupled loads remains a critical challenge in aerospace engineering. This paper develops a temperature-dependent multi-scale progressive failure analysis model based on micromechanical failure theory. A hexagonal representative volume element (RVE) incorporating fibers, matrix and interphase is constructed, with a stress amplification factor enabling macro–meso stress–strain transformation. Dimensionless temperature corrections are applied to resin and interphase mechanical properties, and temperature-influenced mesoscopic failure criteria with corresponding stiffness degradation schemes are proposed. The nonlinear progressive damage simulation is implemented via the ABAQUS/UMAT subroutine. Static tensile tests on AC531/CCF800H composite-7075 aluminum alloy three-bolt double-shear joints are conducted at −70 °C, 20 °C and 120 °C. The results show excellent agreement between the simulations and experiments, with ultimate load errors < 5%. Low temperature increases load capacity by 3.91% via resin hardening and enhanced interfacial bonding, while high temperature reduces it by 9.07% due to resin softening. Failure modes shift from end-hole tensile fracture (−70 °C, 20 °C) to full-hole bearing failure (120 °C), governed by altered bolt load distribution and damage evolution paths. The proposed model provides reliable support for thermo-mechanical design and strength verification of aerospace composite structures.
Zixun Zhu, Rui Hou, Yue Liu et al.· Materials· 0 citations
Polymer composite materials are increasingly utilized in vibration-sensitive engineering applications due to their high strength-to-weight ratio, design flexibility, and tailorable dynamic properties. Among these properties, natural frequency plays a crucial role in determining structural stability, resonance avoidance, and dynamic performance. This review presents a comprehensive synthesis of recent research on the natural frequency characteristics of polymer composite structures, with emphasis on material properties, structural configurations, boundary conditions, damage effects, environmental influences, and advanced reinforcement strategies. A systematic literature review methodology was adopted, and twenty-seven peer-reviewed research articles were analyzed using analytical, numerical, and experimental perspectives. The review highlights key trends indicating that fiber type, volume fraction, hybridization, and smart material integration significantly influence natural frequency behavior. Damage and environmental exposure were found to reduce natural frequency due to stiffness degradation, while advanced fillers and smart composites enable effective frequency tuning and active vibration control. Despite extensive research, gaps remain in multi-physics integration, long-term durability assessment, and large-scale experimental validation. This review consolidates existing knowledge, identifies research gaps, and provides direction for future investigations aimed at dynamically optimized polymer composite structures in machine dynamics applications.
Shashank S. Patokar, Bhagyashri P. Thakur, Sairaj S. Gujar et al.· Journal of Polymer & Composi...· 0 citations
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