scholarly journals Experimental study on influence of aggregate gradation on properties of silica aerogel-glazed hollow beads composite insulation mortar

2021 ◽  
Vol 252 ◽  
pp. 02038
Author(s):  
Wang Yiren ◽  
Ju Lian ◽  
Xu Jinmei ◽  
Zhang Zhijun
Keyword(s):  
Mechanical Properties ◽  
Experimental Study ◽  
Mechanical Strength ◽  
Thermal Insulation ◽  
Fire Resistance ◽  
Silica Aerogel ◽  
Narrow Range ◽  
Aggregate Gradation ◽  
Aggregate Content

Taking the defects of narrow range of particle gradation of glazed hollow beads and low mechanical strength of silica aerogel into consideration, silica aerogel and glazed hollow bead have been mixed for the composite aggregate of insulation mortar. Some measures, such as composite aggregate and particle gradation, were taken to optimize the properties of aggregate formulation, analyzing kinds of factors that influence on the properties of the mortar thoroughly, such as mechanical properties, thermal insulation properties and fire-resistance properties. Under the condition of 60vol% aggregate content, it was found that compositing 35vol% silica aerogel and 65vol% glazed hollow beads as the composite aggregate was optimum for producing insulation mortar samples with suitable properties.

Super strong, shear resistant, and highly elastic lamellar structured ceramic nanofibrous aerogels for thermal insulation

2021 ◽  
Author(s):  
Xin Zhang ◽  
Cheng Liu ◽  
Xinxin Zhang ◽  
Yang Si ◽  
Jianyong Yu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Thermal Insulation ◽  
Fire Resistance ◽  
Extreme Conditions ◽  
Advanced Ceramic ◽  
Strong Shear

Advanced ceramic aerogels with ultra-strong mechanical properties and excellent fire resistance are critically required as heat insulators under extreme conditions. Nevertheless, the current use of ceramic aerogels is usually restricted...

scholarly journals Design and Validation of Thermal Insulation for Deep-sea Fluid Sampler of Jiaolong Human Occupied Vehicle

2021 ◽  
Vol 2095 (1) ◽  
pp. 012070
Author(s):  
Kaiben Yu ◽  
Le Zong ◽  
Shengqi Yu ◽  
Qingjian Meng ◽  
Baohua Liu
Keyword(s):  
Experimental Study ◽  
Thermal Insulation ◽  
Deep Sea ◽  
Silica Aerogel ◽  
Simulation Analysis ◽  
Maximum Temperature ◽  
Vehicle Simulation ◽  
Variation Characteristics ◽  
Insulation Effect ◽  
Insulation Performance

Abstract In this paper, a thermal insulation structure with silica aerogel felt as filler material was designed for the requirements of deep-sea fluid thermal insulation sampling technology for Jiaolong human occupied vehicle. Simulation analysis of thermal insulation performance was carried out and an experimental prototype was developed for the thermal insulation structure. Experimental study on thermal insulation performance was conducted with the variation characteristics of the operation environment for Jiaolong human occupied vehicle being taken into account. Results show that the silica aerogel felt with a thickness of 30 mm filled in the radial space between the inner and outer cylinders can achieve the expected thermal insulation effect during the diving-sampling-transferring process, with maximum temperature rise of 8.5 °C, and can meet the requirements of deep-sea fluid thermal insulation sampling technology.

Development and experimental study of an automated laser-foil-printing additive manufacturing system

2022 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Chia-Hung Hung ◽  
Tunay Turk ◽  
M. Hossein Sehhat ◽  
Ming C. Leu
Keyword(s):  
Mechanical Properties ◽  
Experimental Study ◽  
Additive Manufacturing ◽  
Mechanical Strength ◽  
Automated System ◽  
304L Stainless Steel ◽  
Powder Bed Fusion ◽  
Content Type ◽  
Powder Bed ◽  
Manufacturing Methods

Purpose This paper aims to present the development and experimental study of a fully automated system using a novel laser additive manufacturing technology called laser foil printing (LFP), to fabricate metal parts layer by layer. The mechanical properties of parts fabricated with this novel system are compared with those of comparable methodologies to emphasize the suitability of this process. Design/methodology/approach Test specimens and parts with different geometries were fabricated from 304L stainless steel foil using an automated LFP system. The dimensions of the fabricated parts were measured, and the mechanical properties of the test specimens were characterized in terms of mechanical strength and elongation. Findings The properties of parts fabricated with the automated LFP system were compared with those of parts fabricated with the powder bed fusion additive manufacturing methods. The mechanical strength is higher than those of parts fabricated by the laser powder bed fusion and directed energy deposition technologies. Originality/value To the best knowledge of authors, this is the first time a fully automated LFP system has been developed and the properties of its fabricated parts were compared with other additive manufacturing methods for evaluation.

Strong Interlocked Skeleton Dense Gradation for Cement-Fly Ash Stabilized Crushed-Stones

2011 ◽  
Vol 413 ◽  
pp. 507-513 ◽  
Author(s):  
Di Li ◽  
Ying Jun Jiang
Keyword(s):  
Mechanical Property ◽  
Experimental Study ◽  
Fly Ash ◽  
Compression Strength ◽  
Coarse Aggregate ◽  
Material Design ◽  
Fine Aggregate ◽  
Aggregate Gradation ◽  
Aggregate Content ◽  
Numerical Experimentation

In order to optimize the material design for cement-fly ash stabilized crushed-stones, the strong interlocked coarse skeleton gradation was put forward based on the numerical experimentation method. In addition, the vibration method was employed to carry out the experimental study on the mechanical property of the cement-fly ash stabilized crushed-stones. Besides, the influencing regularities of the mixed amount of cement and fly ash on the cement-fly ash stabilized crushed-stones were researched. The result showed that the numerically simulated coarse aggregate gradation had great interlocked power, and the fine aggregate content of 31%±3% had stabilized mechanical property. Then, strong interlocked skeleton dense gradation of the cement-fly ash stabilized crushed-stones was put forward. Furthermore, when the 7d compression strength was used as the research indicator, the best proportion of the cement and fly ash was 1:0.5~1:1, and when the ultimate strength was used as the research indicator, then, the best ratio of the cement and fly ash was 1:1~1:1.5. Therefore, the cement dosage was advised to be 3~4% and the mixture amount of fly ash was 4~5%.

Mechanical Properties of Fiberboard Overpack Materials in the 9975 Shipping Package

2005 ◽  
Author(s):  
W. L. Daugherty ◽  
P. R. Vormelker
Keyword(s):  
Mechanical Properties ◽  
Mechanical Strength ◽  
Memory Effect ◽  
Thermal Insulation ◽  
Fiber Orientation ◽  
Impact Resistance ◽  
Radioactive Material ◽  
Ambient Conditions ◽  
Short Term ◽  
Original Strength

Many radioactive material (RAM) shipping packages incorporate cane fiberboard overpacks for thermal insulation and impact resistance. Mechanical strength (tensile and compressive) has been measured on cane fiberboard and a similar wood-based product following short-term conditioning in several temperature/humidity environments. Both products show similar trends and vary in behavior with fiber orientation, temperature and humidity. A memory effect also exists where original strength values are only partially recovered following exposure to a degrading environment and return to ambient conditions.

Tendon Implantation into Bone: An Experimental Study

1987 ◽  
Vol 12 (3) ◽  
pp. 306-312
Author(s):  
J. R. JONES ◽  
J. G. SMIBERT ◽  
C. J. MCCULLOUGH ◽  
A. B. PRICE ◽  
W.C. HUTTON
Keyword(s):  
Mechanical Properties ◽  
Experimental Study ◽  
Mechanical Strength ◽  
Functional State ◽  
Tendon Transfer ◽  
Histological Structure ◽  
Tendon Transfers ◽  
Tendon Grafts ◽  
Surgical Implantation

We report the results of an experimental study to investigate the mechanical properties and histological structure of the tendon-bone junction following surgical implantation of tendon into bone in the rabbit. The results following tendon transfer and tendon grafting were compared. The normal four-zone tendon junction was not reproduced histologically, in either group, After 20 weeks, the mechanical strength of the tendon transfers had reached 60% of the controls and that of the tendon grafts 20% of the controls. Microangiography demonstrated that these differences were not related to the vascularisation of the tendon bone juction. The mechanical properties of the tendon-bone junction may be dependent more on the functional state of the implanted tendon than on its structure.

scholarly journals Experimental Study on the Shear Strength of Cement-Sand-Gravel Material

2018 ◽  
Vol 2018 ◽  
pp. 1-11 ◽  
Author(s):  
Jie Yang ◽  
Xin Cai ◽  
Qiong Pang ◽  
Xing-wen Guo ◽  
Ying-li Wu ◽  
...  
Keyword(s):  
Experimental Study ◽  
Shear Strength ◽  
Triaxial Compression ◽  
Strength Criterion ◽  
Confining Pressure ◽  
Strength Development ◽  
Compression Tests ◽  
Aggregate Gradation ◽  
Aggregate Content ◽  
Cementing Agent

An experimental study on the shear strength development of cement-sand-gravel (CSG) material was carried out using triaxial compression tests. The effects of the cementing agent content, aggregate content, and gradation on the shear strength of CSG material were analyzed. The shear strength remarkably increased with increasing cementing agent content and aggregate content for a given confining pressure. The increase in shear strength with increasing cementing agent content far exceeded that with increasing aggregate content. However, the stress-strain curves and shear strength changed only slightly when the aggregate gradation for CSG material was adjusted. Based on the test data, a strength criterion for CSG material is proposed as a function of the cementing agent content, aggregate content, and shear strength of the aggregate gradation.

The Micro-Analysis of Thermal Insulation Glazed Hollow Bead Concrete after High Temperature

2014 ◽  
Vol 638-640 ◽  
pp. 1478-1484
Author(s):  
Ze Ping Zhang ◽  
Jia Yu ◽  
Fei Fei Li
Keyword(s):  
Mechanical Properties ◽  
Experimental Study ◽  
Electron Microscope ◽  
High Temperature ◽  
Thermal Insulation ◽  
Building Material ◽  
Physical And Mechanical Properties ◽  
Ordinary Concrete ◽  
General Physical ◽  
Micro Analysis

Thermal insulation glazed hollow bead concrete is a new building material, which is bearing general physical and mechanical properties of concrete. Experimental study of concrete after high-temperature, it is different from the ordinary concrete, because there is component of glazed hollow bead. In this paper, based on the observations and analysis of thermal insulation glazed hollow bead concrete after high temperature under electron microscope and comparison with ordinary concrete, the failure mechanism of thermal insulation glazed hollow bead concrete after high temperature are obtained.

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