scholarly journals Dynamic Mechanical Behavior of Fiber-Reinforced Seawater Coral Mortars

Materials ◽  
2019 ◽  
Vol 13 (1) ◽  
pp. 118
Author(s):  
Wu-Jian Long ◽  
Jiangsong Tang ◽  
Hao-Dao Li ◽  
Yaocheng Wang ◽  
Qi-Ling Luo
Keyword(s):  
Elastic Modulus ◽  
Mechanical Behavior ◽  
Storage Modulus ◽  
Loss Factor ◽  
Fiber Reinforced ◽  
Replacement Rate ◽  
Dynamic Mechanical ◽  
Dynamic Mechanical Behavior ◽  
Pva Fiber ◽  
Mechanical Strengths

Coral aggregate has been widely used for island construction because of its local availability. However, the addition of coral aggregate exaggerates the brittle nature of cement-based materials under dynamic loading. In this study, polyvinyl alcohol (PVA) fiber was used to improve dynamic mechanical behavior of seawater coral mortars (SCMs). The effects of coral aggregate and PVA fiber on the workability, static mechanical strengths, and dynamic mechanical behavior of fiber-reinforced SCMs were investigated. Results showed that the workability of the SCM decreased with increasing coral aggregate replacement rate and PVA fiber content. Mechanical strengths of the SCM increased with increasing PVA fiber content, but decreased with increasing coral aggregate replacement rate. Dynamic mechanical behavior at varying coral aggregate replacement rates was analyzed by combining dynamic mechanical analysis and micro-scale elastic modulus experiment. With increasing coral aggregate replacement rate, the storage modulus, loss factor, and elastic modulus of the interfacial transition zone in the SCM decreased. Nevertheless, with the incorporation of PVA fibers (1 vol.%), the storage modulus and loss factor were improved dramatically by 151.9 and 73.3%, respectively, compared with the reference group. Therefore, fiber-reinforced coral mortars have a great potential for use in island construction, owing to the excellent anti-vibrational performance.

Dynamic Strain Effects in Elastomers

1963 ◽  
Vol 36 (2) ◽  
pp. 407-421 ◽  
Author(s):  
Glenn E. Warnaka
Keyword(s):  
Elastic Modulus ◽  
Mechanical Behavior ◽  
Strain Amplitude ◽  
Loss Factor ◽  
Dynamic Strain ◽  
Dynamic Mechanical ◽  
Small Strains ◽  
Dynamic Mechanical Behavior ◽  
Elastomeric Materials ◽  
Practical Engineering

Abstract Many common elastomeric materials have two ranges of dynamic-mechanical behavior. Such materials behave as viscoelastomers at very small strains and as plastoelastomers at strains of practical engineering interest. The change from viscoelastic to plastoelastic behavior occurs at dynamic strain amplitudes of 0.001 inches per inch to 0.005 inches per inch. In the plastoelastic range, the dynamic elastic modulus decreases with increasing dynamic strain amplitude. Loss factor reaches a maximum in the plastoelastic range.

scholarly journals Experimental and artificial neural network approach for prediction of dynamic mechanical behavior of sisal/glass hybrid composites

2021 ◽  
pp. 096739112110378
Author(s):  
Heitor Luiz Ornaghi ◽  
Francisco M Monticeli ◽  
Roberta Motta Neves ◽  
Ademir José Zattera ◽  
Sandro Campos Amico
Keyword(s):  
Neural Network ◽  
Artificial Neural Network ◽  
Mechanical Behavior ◽  
Storage Modulus ◽  
Loss Modulus ◽  
Mathematical Tool ◽  
Dynamic Mechanical ◽  
Dynamic Mechanical Behavior ◽  
Artificial Neural ◽  
Tan Δ

The dynamic mechanical behavior (storage modulus, loss modulus, and tan δ) of hybrid sisal/glass composites was investigated in the temperature range of 30–210 °C, for two different volume percentages of reinforcement along with the different ratios of sisal and glass fibers. Based on the experimental outcome, an artificial neural network (ANN) approach was used to predict the dynamic mechanical properties followed by a surface response methodology (SRM). The ANN analysis showed an excellent fit with the storage modulus, loss modulus, and tan δ experimental data. In addition, the fitted curves with the ANN approach were used to propose equations based on SRM. The simulation result has shown that the ANN is a potential mathematical tool for the structure–property correlation for polymer composites and may help researchers in the development and application of their data, reducing the need for long experimental campaigns.

Mechanical Properties and Dynamic Mechanical Behavior for Long Aramid Fiber Reinforced Impact Polypropylene Copolymer

2012 ◽  
Vol 591-593 ◽  
pp. 1079-1082 ◽  
Author(s):  
Hao Tan ◽  
Hong Sheng Tan ◽  
Xin Lei Tang ◽  
Yan Gang Wang ◽  
Li Ping Li
Keyword(s):  
Mechanical Properties ◽  
Mechanical Behavior ◽  
Aramid Fiber ◽  
Fiber Reinforced ◽  
Aramid Fibers ◽  
Dynamic Mechanical ◽  
Composite Deformation ◽  
Dynamic Mechanical Behavior ◽  
Single Screw Extruder ◽  
Impact Polypropylene Copolymer

Composites of continuous aramid fiber reinforced impact polypropylene copolymer (IPC) were prepared using a cross-head impregnation mold by self-design fixed on a single screw extruder, and pelleted by a pelleter for injection molding to prepare testing specimens. The mechanical properties of long aramid fibers reinforced impact polypropylene copolymer (IPC) composites were studied. Micrographs of fracture surface of tensile specimens and dynamic mechanical behavior for the composites were analyzed by scanning electron microscope (SEM) and dynamic mechanical analyzer (DMA). The results of experiments show that, the tensile and flexural strengths increased obviously with the aramid fibers content in the composites. SEM results show the compatibility between the aramid fiber and matrix is very poor. The results of the dynamic mechanical behavior of long aramid fibers reinforced IPC composites show that the composite deformation resistance and glass transition temperature increased evidently with the addition of aramid fibers.

scholarly journals Crystallization and Dynamic Mechanical Behavior of Coir Fiber Reinforced Poly(Butylene Succinate) Biocomposites

2022 ◽  
Vol 10 (4) ◽  
pp. 1039-1048
Author(s):  
Xu Yan ◽  
Changheng Liu ◽  
Liang Qiao ◽  
Kaili Zhu ◽  
Hongsheng Tan ◽  
...  
Keyword(s):  
Mechanical Behavior ◽  
Coir Fiber ◽  
Fiber Reinforced ◽  
Butylene Succinate ◽  
Dynamic Mechanical ◽  
Dynamic Mechanical Behavior
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