Discussion on degree of entanglement, chain confinement, and reinforcement efficiency factor of PTT / PE blend nanocomposite embedded with MWCNTs

2021 ◽  
Author(s):  
Aswathi Madathinal Kunjappan ◽  
Arunima Reghunadhan ◽  
Ajitha A. Ramachandran ◽  
Lovely Mathew ◽  
Moothetty Padmanabhan ◽  
...  
Keyword(s):  
Efficiency Factor ◽  
Reinforcement Efficiency ◽  
Chain Confinement ◽  
Degree Of Entanglement

scholarly journals Ultrasonic Deicing Efficiency Prediction and Validation for a Flat Deicing System

2020 ◽  
Vol 10 (19) ◽  
pp. 6640
Author(s):  
Zhonghua Shi ◽  
Zhenhang Kang ◽  
Qiang Xie ◽  
Yuan Tian ◽  
Yueqing Zhao ◽  
...  
Keyword(s):  
Lead Zirconate Titanate ◽  
Cohesive Zone ◽  
Cohesive Zone Model ◽  
Lead Zirconate ◽  
Efficiency Factor ◽  
Zone Model ◽  
Shear Stresses ◽  
Stress Distributions ◽  
Total Energy Density ◽  
Average Shear

An effective deicing system is needed to be designed to conveniently remove ice from the surfaces of structures. In this paper, an ultrasonic deicing system for different configurations was estimated and verified based on finite element simulations. The research focused on deicing efficiency factor (DEF) discussions, prediction, and validations. Firstly, seven different configurations of Lead zirconate titanate (PZT) disk actuators with the same volume but different radius and thickness were adopted to conduct harmonic analysis. The effects of PZT shape on shear stresses and optimal frequencies were obtained. Simultaneously, the average shear stresses at the ice/substrate interface and total energy density needed for deicing were calculated. Then, a coefficient named deicing efficiency factor (DEF) was proposed to estimate deicing efficiency. Based on these results, the optimized configuration and deicing frequency are given. Furthermore, four different icing cases for the optimize configuration were studied to further verify the rationality of DEF. The effects of shear stress distributions on deicing efficiency were also analyzed. At same time, a cohesive zone model (CZM) was introduced to describe interface behavior of the plate and ice layer. Standard-explicit co-simulation was utilized to model the wave propagation and ice layer delamination process. Finally, the deicing experiments were carried out to validate the feasibility and correctness of the deicing system.

Research on CFRP External Pre Stress Reinforcing Vertical Crack of Box Girder Roof

2014 ◽  
Vol 668-669 ◽  
pp. 236-239
Author(s):  
Xin Zhong Wang
Keyword(s):  
Mechanical Properties ◽  
Crack Width ◽  
Longitudinal Crack ◽  
Design Model ◽  
Vertical Crack ◽  
Box Girder ◽  
External Reinforcement ◽  
Reinforcement Efficiency ◽  
Concrete Box Girder ◽  
Reinforcement Model

the article is about longitudinal crack of concrete box girder roof, and it designed a reinforcement model. As the pre stressed material, CFRP could reach 30% of reinforcement efficiency under different loads in design model through external reinforcement upon calculation and analysis. And its crack width greatly reduces. In this way, the reinforcement purpose could be realized, and the mechanical properties of CFRP concrete could be fully played. The effect is obvious.

Nacre-like GNP/Epoxy Composites: Reinforcement Efficiency vis-à-vis Graphene Content

2021 ◽  
pp. 108873
Author(s):  
Fabrizia Cilento ◽  
Alfonso Martone ◽  
Maria Giovanna Pastore Carbone ◽  
Costas Galiotis ◽  
Michele Giordano
Keyword(s):  
Epoxy Composites ◽  
Graphene Content ◽  
Reinforcement Efficiency

Probabilistic models of the strut efficiency factor for RC deep beams with MCMC method

2020 ◽  
Vol 21 (3) ◽  
pp. 917-933
Author(s):  
Xi Liu ◽  
Tao Wu ◽  
Yuanyuan An ◽  
Yang Liu
Keyword(s):  
Probabilistic Models ◽  
Efficiency Factor ◽  
Mcmc Method ◽  
Deep Beams ◽  
Rc Deep Beams

Mechanical properties of low-density paper

2020 ◽  
Vol 35 (1) ◽  
pp. 61-70
Author(s):  
Na Young Park ◽  
Young Chan Ko ◽  
Lili Melani ◽  
Hyoung Jin Kim
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Structural Change ◽  
Tensile Testing ◽  
Tensile Modulus ◽  
Gauge Length ◽  
Efficiency Factor ◽  
Low Density ◽  
Tensile Stiffness ◽  
Lower Tensile Strength

AbstractFor the mechanical properties of paper, tensile testing has been widely used. Among the tensile properties, the tensile stiffness has been used to determine the softness of low-density paper. The lower tensile stiffness, the greater softness of paper. Because the elastic region may not be clearly defined in a load-elongation curve, it is suggested to use the tensile modulus which is defined as the slope between the two points in the curve. The two points which provide the best correlation with subjective softness evaluation should be selected. Low-density paper has a much lower tensile strength, but much larger elongation at the break. It undergoes a continuous structural change during mechanical testing. The degree of the structural change should depend on tensile conditions such as the sample size, the gauge length, and the rate of elongation. For low-density paper, the tensile modulus and the tensile strength should be independent of each other. The structure efficiency factor (SEF) is defined as a ratio of the tensile strength to the tensile modulus and it may be used a guideline in developing superior low-density paper products.

Transfer to wheat of the copper efficiency factor carried on rye chromosome arm 5RL

1987 ◽  
Vol 99 (1) ◽  
pp. 107-114 ◽  
Author(s):  
Robin D. Graham ◽  
Julie S. Ascher ◽  
P. A. E. Ellis ◽  
K. W. Shepherd
Keyword(s):  
Efficiency Factor ◽  
Chromosome Arm

Energetics of Self-Assembly and Chain Confinement in Silver Alkanethiolates:  Enthalpy−Entropy Interplay

2005 ◽  
Vol 17 (22) ◽  
pp. 5428-5438 ◽  
Author(s):  
Andrey A. Levchenko ◽  
Chanel K. Yee ◽  
Atul N. Parikh ◽  
Alexandra Navrotsky
Keyword(s):  
Self Assembly ◽  
Chain Confinement
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