scholarly journals Damping Characterization of Hybrid Carbon Fiber Elastomer Metal Laminates using Experimental and Numerical Dynamic Mechanical Analysis

2019 ◽  
Vol 3 (1) ◽  
pp. 3 ◽  
Author(s):  
Vincent Sessner ◽  
Alexander Jackstadt ◽  
Wilfried V. Liebig ◽  
Luise Kärger ◽  
Kay A. Weidenmann
Keyword(s):  
Carbon Fiber ◽  
Mechanical Analysis ◽  
Aviation Industry ◽  
Experimental Investigations ◽  
Parameter Study ◽  
Constrained Layer Damping ◽  
Three Point Bending ◽  
Dynamic Mechanical ◽  
Damping Behavior ◽  
Hybrid Carbon

Lightweight structures which consist to a large extent of carbon fiber reinforced plastics (CFRP), often lack sufficient damping behavior. This also applies to hybrid laminates such as fiber metal laminates made of CFRP and aluminum. Since they are usually prone to vibrations due to their high stiffness and low mass, additional damping material is required to meet noise, vibration and harshness comfort demands in automotive or aviation industry. In the present study, hybrid carbon fiber elastomer metal laminates (HyCEML) are investigated which are intended to influence the damping behavior of the laminates by an elastomer interlayer between the CFRP ply and the aluminum sheets. The damping behavior is based on the principle of constrained layer damping. To characterize the damping behavior, dynamic mechanical analyses (DMA) are performed under tension on the elastomer and the CFRP, and under three point bending on the hybrid laminate. Different laminate lay-ups, with and without elastomer, and two different elastomer types are examined. The temperature and frequency dependent damping behavior is related to the bending stiffness and master curves are generated by using the time temperature superposition to analyze the damping behavior at higher frequencies. A numerical model is built up on the basis of DMA experiments on the constituents and micro mechanical studies. Subsequently, three point bending DMA experiments on hybrids are simulated and the results are compared with the experimental investigations. In addition, a parameter study on different lay-ups is done numerically. Increasing vibration damping is correlated to increasing elastomer content and decreasing elastomer modulus in the laminate. A rule of mixture is used to estimate the laminate loss factor for varying elastomer content.

scholarly journals Wide Scale Characterization and Modeling of the Vibration and Damping Behavior of CFRP-Elastomer-Metal Laminates—Comparison and Discussion of Different Test Setups

2021 ◽  
Author(s):  
Vincent Sessner ◽  
Wilfried V. Liebig ◽  
Alexander Jackstadt ◽  
Dominik Schmid ◽  
Tom Ehrig ◽  
...  
Keyword(s):  
Fatigue Behavior ◽  
Glass Fibers ◽  
Mechanical Analysis ◽  
Test Methods ◽  
Aviation Industry ◽  
Constrained Layer Damping ◽  
Damping Properties ◽  
Reinforced Plastics ◽  
Damping Behavior ◽  
The Individual

AbstractThe investigated hybrid carbon fiber reinforced plastics-elastomer-metal laminates (HyCEML) offer the potential of tailored structural materials with adaptable damping properties. Conventional fiber metal laminates, like glass laminate aluminum reinforced epoxy are already widely spread in the aviation industry owing to their outstanding fatigue behavior. By integrating an elastomeric interlayer, the glass fibers can be substituted by carbon fibers and damping properties of these laminates can be adjusted. The viscoelastic interlayer dissipates energy within the laminate by inducing shear strain during bending, which is commonly known as constrained layer damping. The aim of this paper is the description of the vibration and damping behavior of HyCEML over a wide temperature and frequency range by using different test methods. Dynamic mechanical analysis is used for the individual polymeric constituents and coupon specimens and modal analysis is used with different specimen geometries up to a component sized panel. In addition, analytical and numerical approaches complement the experiments and lead to a deeper understanding of the vibration and damping behavior. Owing to the high damping, already at frequencies of 5 kHz only running waves can be detected for the investigated panel size. The discussion of different test methods helps to identify material and wavelength dependent effects, but also possible adverse effects of certain methods.

Dynamic Mechanical Property of Quasi Constrained Layer Structural Piezoelectric Ceramic/Carbon Black/Epoxy Resin Composites

2011 ◽  
Vol 284-286 ◽  
pp. 429-433
Author(s):  
Wen Chao Huang ◽  
Tao Wei ◽  
Min Xian Shi
Keyword(s):  
Carbon Black ◽  
Epoxy Resin ◽  
Piezoelectric Ceramic ◽  
Volume Fraction ◽  
Layer Structure ◽  
Polymeric Composite ◽  
Mechanical Analysis ◽  
Constrained Layer Damping ◽  
Dynamic Mechanical ◽  
Layer Structures

Two-step casting method was developed for preparing quasi constrained layer damping structural polymeric composite. Quasi constrained layer structural piezoelectric ceramic P82/carbon black(CB)/epoxy resin(EP) composites were successfully prepared when the ceramic content was less than 30% in volume. Dynamic mechanical analysis(DMA) showed that the composites with quasi constrained layer structure exhibited perfect damping properties. When the piezoelectric ceramic P82 volume fraction was 10%, the composite showed the highest loss factor peak value of 1.182, the widest damping temperature range of 44.2°C, and the largest loss area of 32.17. The storage moduli of composites with quasi constrained layer structures were higher than that with non quasi constrained layer structure.

scholarly journals Radial Basis Function Neural Network-Based Modeling of the Dynamic Thermo-Mechanical Response and Damping Behavior of Thermoplastic Elastomer Systems

Polymers ◽  
2019 ◽  
Vol 11 (6) ◽  
pp. 1074 ◽  
Author(s):  
Ivan Kopal ◽  
Marta Harničárová ◽  
Jan Valíček ◽  
Jan Krmela ◽  
Ondrej Lukáč
Keyword(s):  
Neural Network ◽  
Radial Basis Function ◽  
Basis Function ◽  
Mechanical Response ◽  
Thermoplastic Elastomer ◽  
Mechanical Analysis ◽  
Thermoplastic Elastomers ◽  
Dynamic Mechanical ◽  
Damping Behavior ◽  
Radial Basis

The presented work deals with the creation of a new radial basis function artificial neural network-based model of dynamic thermo-mechanical response and damping behavior of thermoplastic elastomers in the whole temperature interval of their entire lifetime and a wide frequency range of dynamic mechanical loading. The created model is based on experimental results of dynamic mechanical analysis of the widely used thermoplastic polyurethane, which is one of the typical representatives of thermoplastic elastomers. Verification and testing of the well-trained radial basis function neural network for temperature and frequency dependence of dynamic storage modulus, loss modulus, as well as loss tangent prediction showed excellent correspondence between experimental and modeled data, including all relaxation events observed in the polymeric material under study throughout the monitored temperature and frequency interval. The radial basis function artificial neural network has been confirmed to be an exceptionally high-performance artificial intelligence tool of soft computing for the effective predicting of short-term viscoelastic behavior of thermoplastic elastomer systems based on experimental results of dynamic mechanical analysis.

Characterization of carbon fiber-reinforced poly(phenylene sulfide) composites prepared with various compatibilizers

2019 ◽  
Vol 54 (1) ◽  
pp. 89-100 ◽  
Author(s):  
Bedriye U Durmaz ◽  
Ayse Aytac
Keyword(s):  
Electron Microscope ◽  
Carbon Fiber ◽  
Scanning Electron Microscope ◽  
Tensile Test ◽  
Dynamic Mechanical Analysis ◽  
Mechanical Analysis ◽  
Dynamic Mechanical ◽  
Scanning Electron ◽  
Phenylene Sulfide

The aim of this study was to investigate the effects of different compatibilizers on the properties of polyamide-sized carbon fiber-reinforced poly(phenylene sulfide) composites. The composites were prepared by using melt blending and injection molding methods by using three different compatibilizers at various loading levels. The characterization of composites was performed by Fourier transform infrared spectroscopy, tensile test, dynamic mechanical analysis, differential scanning thermometer, thermogravimetric analysis and scanning electron microscope. According to tensile test results, the highest increment in tensile strength and strain at break values of composites was observed with the addition of Joncryl. According to scanning electron microscope and dynamic mechanical analysis results, the best interfacial adhesion between carbon fiber and poly(phenylene sulfide) was obtained by using Joncryl as the compatibilizer.

Dynamic mechanical analysis (DMA) of waterlogged archaeological wood at room temperature

Holzforschung ◽  
2018 ◽  
Vol 72 (5) ◽  
pp. 421-431 ◽  
Author(s):  
Benedetto Pizzo ◽  
Elisa Pecoraro ◽  
Simona Lazzeri
Keyword(s):  
Dynamic Mechanical Analysis ◽  
Room Temperature ◽  
Loss Modulus ◽  
Basic Density ◽  
Mechanical Analysis ◽  
Sustained Load ◽  
Three Point Bending ◽  
Dynamic Mechanical ◽  
Archaeological Wood ◽  
Water Saturated

AbstractThe viscoelastic properties of waterlogged wood (WLW) were investigated via dynamic mechanical analysis (DMA) at room temperature and under water saturated conditions, aiming at the investigation of the relationships between viscoelasticity and chemical composition. Different softwoods (SWs) and hardwoods (HWs) from several archaeological sites were sampled, which had different levels of decay (from highly-decayed to little changed). The analytical methods included lignin and holocellulose determination by Fourier transform infrared (FTIR) spectroscopy, moisture content (MC), basic density (BD), micromorphological observations, and the DMA was performed in three-point bending and submersion mode. Both HWs and SWs showed an exponential decrease of both storage modulus (E′) and loss modulus (E″), which are related to the amount of crystalline and paracrystalline cellulose left in the cell wall, respectively. The ratio E″/E′ (tanδ) varied with the frequency in different ways depending on the preservation state of the samples. Less decayed material had a higher tanδ than the fresh reference wood and lower (or similar) tanδ in the case of highly decayed samples. Accordingly, the long-term behaviour under a certain sustained load of WLW is decay dependent.

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