Structural and Thermal Performance of a Novel Form of Cladding Panel: the I-beam Beetle Elytron Plate

2021 ◽  
pp. 1-33
Author(s):  
Liping Hu ◽  
Zhijie Zhang ◽  
Jinxiang Chen ◽  
Hao Ren
Keyword(s):  
Thermal Insulation ◽  
Structural Parameters ◽  
Safety Margin ◽  
The Finite Element Method ◽  
Practical Applications ◽  
Principal Tensile Stress ◽  
Core Height ◽  
Traditional Structures ◽  
Panel Thickness ◽  
Insulation Performance

To develop a nonbearing prefabricated straw sandwich concrete wallboard (I-beam beetle elytron plate: IBEPsc), the effect of certain structural parameters (e.g., panel thickness T, number of I-cores N and core height h) on the mechanical and thermal insulation performance was investigated by using the finite element method. The results are as follows: 1) The bearing capacity of the IBEPsc is controlled by the maximum principal tensile stress; the optimal structural parameters of the IBEPsc for a self-insulated wall with a large safety margin are presented. 2) The consideration of strips vs. whole plates and the selected upper bearing constraint type have little influence on the mechanical properties. In practical applications, the strips and whole plates can be reasonably selected according to engineering needs, and these components can be connected with the main structure by conventional mortar. 3) According to a qualitative analysis and comparison with common I-shaped thermal insulation walls, the IBEPsc requires the least material and weight while ensuring a sufficient safety margin in terms of mechanical and thermal insulation performance. Hence, biomimic techniques can play a key role in breaking through the limitations of traditional structures. This paper can help direct the application of beetle elytron plates in prefabricated wallboards.

Influences of structural parameters on the thermal properties of coated glass fiber fabrics under ablation condition investigated by numerical model

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Zhenrong Zheng ◽  
Jiawei Wang ◽  
Qian Zhang ◽  
Kezhu Mao ◽  
Lijuan Luo ◽  
...  
Keyword(s):  
Numerical Model ◽  
Glass Fiber ◽  
Thermal Insulation ◽  
Structural Parameters ◽  
Silicone Resin ◽  
Content Type ◽  
Coated Glass ◽  
Coated Fabric ◽  
Insulation Performance ◽  
Fiber Fabric

Purpose The purpose of this paper is to investigate the effects of structural parameters of fabric on thermal insulation properties of the coated fabric. Design/methodology/approach The authors established a numerical model for the ablation of silicone resin-coated fabric under high heat flow, and the simulation results have been validated by quartz lamp ablation experiment. The model was used to investigate the effects of structural parameters of glass fiber fabrics on the heat transfer process of the coated fabric. Findings The numerical values were in agreement with the experimental values. The thermal insulation of the coated glass fiber fabric was better than coated carbon fabric. Thermal insulation performance of the coated glass fiber fabrics was in order plain < 2/1 twill < 3/3 twill < 5/3 stain fabric. Increasing the warp density, from 100 to 180 ends/10 cm, the temperature of the back surface of the coated glass fiber fabric was reduced from 601°C to 553°C. Thermal insulation performance dramatically increased as yarn fineness went from 129 to 280 tex, and the temperature difference was 63°C. Research limitations/implications In the ablation process, to simplify the calculation, the combustion reaction of silicone resin was ignored, which can be added in the future research. Originality/value This paper provides the ablation model of the silicon-coated fabric based on the 3D geometry model to explore the influence of the structural parameters of coated glass fiber fabric on its thermal protection performance.

scholarly journals Design of a Surface Plasmon Resonance Temperature Sensor with Multi-Wavebands Based on Conjoined-Tubular Anti-Resonance Fiber

Photonics ◽  
2021 ◽  
Vol 8 (6) ◽  
pp. 231
Author(s):  
Qiming Wang ◽  
Xuenan Zhang ◽  
Xin Yan ◽  
Fang Wang ◽  
Tonglei Cheng
Keyword(s):  
Surface Plasmon Resonance ◽  
Surface Plasmon ◽  
Plasmon Resonance ◽  
Temperature Sensor ◽  
Structural Parameters ◽  
High Sensitivity ◽  
Biological Research ◽  
The Finite Element Method ◽  
Practical Applications ◽  
Spr Effect

In this work, a surface plasmon resonance (SPR) temperature sensor based on a con-joined-tubular anti-resonance optical fiber (CTF) was theoretically designed and analyzed using the finite element method. The CTF cladding was composed of eight pairs of conjoined tubes, and one or two holes of the tubes were selectively coated with gold to generate the SPR effect. Alcohol was injected into the core of the CTF to work as the sensing medium using vapor deposition. The proposed sensing structure exhibited excellent birefringence and produced more than six resonant peaks in different wavebands of the X and Y polarization. The positions of those resonant peaks were sensitive to temperature change, and the simulated sensitivity was about 3.2–3.6 nm/°C. The multiple working wavebands of the proposed sensing structure could be used for self-verification. Moreover, the influence of structural parameters on sensing performance was analyzed in detail. Possessing features of high sensitivity, good birefringence, multiple measuring wavebands, and self-verification, the proposed CTF-based SPR sensor has great potential in practical applications such as biological research and chemical sensing.

Effects of structural parameters on the thermal insulation properties of coated carbon fiber fabrics

2019 ◽  
Vol 90 (13-14) ◽  
pp. 1549-1557
Author(s):  
Qian Zhang ◽  
Zhenrong Zheng ◽  
Kezhu Mao ◽  
Wei Zhi ◽  
Lijuan Luo ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Carbon Fiber ◽  
Thermal Insulation ◽  
Structural Parameters ◽  
Heat Transfer Model ◽  
Transfer Model ◽  
Numerical Heat Transfer ◽  
Structure Density ◽  
Coated Carbon ◽  
Insulation Performance

In order to predict the thermal insulation performance of coated carbon fiber fabric, a numerical heat transfer model under high temperature was established. The simulation results were validated by quartz lamp ablation experiment. The experimental values were in agreement with the numerical values, and the average relative error between them was 9.47%. Furthermore, the impact of structural parameters on the thermal insulation of coated carbon fiber fabrics, by using the numerical heat transfer model, was investigated. The results show that thermal insulation for the samples is in the order of plain < 2/1 twill < 3/3 twill < 5/3 stain, when using constant structure density and yarn fineness. Thermal insulation performance of the samples dramatically increases as yarn fineness goes from 3 to 12 K. Furthermore, when the structure density increases to more than 70 ends/10 cm, the thermal insulation property shows an increasing trend.

Study of Thermal Insulation Performance of Layered Jute Nonwoven: A Sustainable Material

2021 ◽  
pp. 1-14
Author(s):  
Kartick K. Samanta ◽  
Izhar Mustafa ◽  
Sayandeep Debnath ◽  
Esha Das ◽  
G. Basu ◽  
...  
Keyword(s):  
Thermal Insulation ◽  
Sustainable Material ◽  
Insulation Performance

“Stiff–Soft” Binary Synergistic Aerogels with Superflexibility and High Thermal Insulation Performance

2019 ◽  
Vol 29 (15) ◽  
pp. 1806407 ◽  
Author(s):  
Junyan Zhang ◽  
Yanhua Cheng ◽  
Mike Tebyetekerwa ◽  
Si Meng ◽  
Meifang Zhu ◽  
...  
Keyword(s):  
Thermal Insulation ◽  
Insulation Performance

scholarly journals Stability charts based on the finite element method for underground cavities in soft carbonate rocks: validation through case-study applications

2019 ◽  
Vol 19 (10) ◽  
pp. 2079-2095 ◽  
Author(s):  
Michele Perrotti ◽  
Piernicola Lollino ◽  
Nunzio Luciano Fazio ◽  
Mario Parise
Keyword(s):  
Finite Element ◽  
Safety Margin ◽  
Structural Elements ◽  
The Finite Element Method ◽  
Geometrical Features ◽  
Overall Stability ◽  
Underground Cavities ◽  
The Stability ◽  
Rock Mechanical Properties

Abstract. The stability of man-made underground cavities in soft rocks interacting with overlying structures and infrastructures represents a challenging problem to be faced. Based upon the results of a large number of parametric two-dimensional (2-D) finite-element analyses of ideal cases of underground cavities, accounting for the variability both cave geometrical features and rock mechanical properties, specific charts have been recently proposed in the literature to assess at a preliminary stage the stability of the cavities. The purpose of the present paper is to validate the efficacy of the stability charts through the application to several case studies of underground cavities, considering both quarries collapsed in the past and quarries still stable. The stability graphs proposed by Perrotti et al. (2018) can be useful to evaluate, in a preliminary way, a safety margin for cavities that have not reached failure and to detect indications of predisposition to local or general instability phenomena. Alternatively, for sinkholes that already occurred, the graphs may be useful in identifying the conditions that led to the collapse, highlighting the importance of some structural elements (as pillars and internal walls) on the overall stability of the quarry system.

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