Study on dynamic mechanical properties of viscoelastic damping materials based on finite element theory

A series of para-phenylene terephthalamide pulp modified damping materials were prepared. The dynamic mechanical properties, differential scanning calorimetry, vibration damping properties, vulcanization property, tensile strengths as well as scanning electron microscopy micrographs of the damping materials were studied theoretically and experimentally. The dynamic mechanical properties of para-phenylene terephthalamide pulp modified damping materials were also compared with aramid short-cut fiber, E-glass staple fiber and carbon fiber powder modified damping materials. The results showed that para-phenylene terephthalamide pulp modified damping materials exhibited the best damping property and highest modulus in comparison with the other types of fibers. The storage modulus ( E′), loss modulus ( E″) and tensile strength of the materials were all increased significantly with increasing pulp content, and this trend was significantly greater in machine direction rather than in cross-machine direction. The second, third and fourth modes modal loss factors (η) of the steel beams coated with para-phenylene terephthalamide pulp modified damping materials increased substantially up to a maximum, and then became stable with increasing pulp amount. The optimal η in machine direction was achieved as the mass ratio of butadiene-acrylonitrile rubber to para-phenylene terephthalamide pulp was 100:30. Excellent damping property was mainly attributed to the extremely high interfacial contact area which significantly improved the efficiency of energy dissipation of internal friction, interfacial sliding and dislocation motion between para-phenylene terephthalamide pulps and butadiene-acrylonitrile rubber chains. Since para-phenylene terephthalamide pulp modified damping materials offer a high E′, excellent vibration damping properties, broad damping temperature and frequency ranges, it is ideal for free-damping structures which are widely utilized in industrial vibration and noise control applications.

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Finite element investigation on the dynamic mechanical properties of low-frequency vibrations on human L2–L3 spinal motion segments with different degrees of degeneration

Medical & Biological Engineering & Computing ◽

10.1007/s11517-020-02263-0 ◽

2020 ◽

Vol 58 (12) ◽

pp. 3003-3016

Author(s):

Ruoxun Fan ◽

Jie Liu ◽

Jun Liu

Keyword(s):

Mechanical Properties ◽

Finite Element ◽

Low Frequency ◽

Dynamic Mechanical Properties ◽

Spinal Motion ◽

Dynamic Mechanical

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Quantifying dynamic mechanical properties of human placenta tissue using optimization techniques with specimen-specific finite-element models

Journal of Biomechanics ◽

10.1016/j.jbiomech.2009.07.003 ◽

2009 ◽

Vol 42 (15) ◽

pp. 2528-2534 ◽

Cited By ~ 29

Author(s):

Jingwen Hu ◽

Kathleen D. Klinich ◽

Carl S. Miller ◽

Giseli Nazmi ◽

Mark D. Pearlman ◽

...

Keyword(s):

Mechanical Properties ◽

Finite Element ◽

Human Placenta ◽

Dynamic Mechanical Properties ◽

Optimization Techniques ◽

Finite Element Models ◽

Dynamic Mechanical

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Enhancement of stiffness and dynamic mechanical properties of polymers using single-walled-carbon-nanotube – a multiscale finite element formulation study

Journal of Polymer Research ◽

10.1007/s10965-019-1774-9 ◽

2019 ◽

Vol 26 (5) ◽

Cited By ~ 4

Author(s):

Jorge Alberto Palacios ◽

Rajamohan Ganesan

Keyword(s):

Mechanical Properties ◽

Finite Element ◽

Carbon Nanotube ◽

Dynamic Mechanical Properties ◽

Finite Element Formulation ◽

Element Formulation ◽

Single Walled Carbon Nanotube ◽

Single Walled Carbon ◽

Dynamic Mechanical ◽

Multiscale Finite Element

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Preparation and characterization of polyurethane damping materials derived from mixed-base prepolymers containing numerous side methyls

e-Polymers ◽

10.1515/epoly-2015-0097 ◽

2015 ◽

Vol 15 (5) ◽

pp. 323-327 ◽

Cited By ~ 1

Author(s):

Yang Feng ◽

Haijun Zhou ◽

Xiaolei Zhang ◽

Yongzhen Li ◽

Yantao Li

Keyword(s):

Mechanical Properties ◽

Testing Machine ◽

Dynamic Mechanical Properties ◽

Toluene Diisocyanate ◽

Scanning Tunneling ◽

Polypropylene Glycol ◽

Tunneling Microscopy ◽

Tensile Testing Machine ◽

Dynamic Mechanical ◽

Damping Materials

AbstractPolyurethane (PU) damping materials were prepared by mixed-base PU prepolymers and 4,4′-methylene- bis-(2-chloroaniline) (MOCA) as chain extender. The prepolymer was synthesized from poly(hydroxypivalyl hydroxypivalate succinate) (PHPS) or polypropylene glycol 2000 (PPG-2000) with 2,4-toluene diisocyanate (TDI-100), respectively. The structure, morphology, and dynamic and static mechanical properties were characterized by Fourier transform infrared spectroscopy (FT-IR), scanning tunneling microscopy (STM), dynamic mechanical thermal analysis (DMA), and tensile testing machine, respectively. The results indicated that the mass ratios of polyester prepolymer (PESP) and polyether prepolymer (PETP) (mPESP/mPETP ratio) had significantly affected the dynamic mechanical properties of the PUs. When the mPESP/mPETP ratio was 40/60 and 45/55, and PUs had the temperature range (ΔT) higher than 60°C for efficient loss factor (tanδ>0.4) in the DMA curve with bimodal. The phase diagrams of STM indicated that more complex combination of hard and soft segments existed in the PUs, and the segments of PESP and PETP formed irregular block structures. Furthermore, the mechanical properties of PUs were of higher value. It is believed that PUs may be used as potential damping materials.

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