Temperature Field Test and Numerical Simulation Research in Concrete under Cryogenic Temperature

2014 ◽  
Vol 687-691 ◽  
pp. 4415-4419 ◽  
Author(s):  
Ling Feng Li ◽  
Lu Hui Yan ◽  
Yu Wu Zhang
Keyword(s):  
Mechanical Properties ◽  
Thermal Conductivity ◽  
Numerical Simulation ◽  
Heat Capacity ◽  
Temperature Field ◽  
Low Temperature ◽  
Field Test ◽  
Cryogenic Temperature ◽  
Test Results ◽  
Simulation Research

The mechanical properties of concrete under cryogenic temperature (-165°C) are affected by the temperature field inside the concrete. This paper presents assumptions by adjusting the formulas of thermal conductivity (λ) and specific heat capacity (C), respectively under low temperature. Through ABAQUS, we simulate the temperature downward-upward processes and compare them with the test results. Finally, the research gets more reasonable formulas of λ and C, respectively under cryogenic temperature.

The Numerical Simulation Research of Thermal Mechanical Simulation Compression Behavior with Uneven Temperature on End

2013 ◽  
Vol 762 ◽  
pp. 368-373
Author(s):  
Lei Yao ◽  
Zheng Fang ◽  
Zhang Ge
Keyword(s):  
Numerical Simulation ◽  
Temperature Field ◽  
Friction Coefficient ◽  
Strain Rate ◽  
Deformation Resistance ◽  
Simulation Research ◽  
Compression Behavior ◽  
Mechanical Simulation ◽  
Strain And Strain Rate ◽  
Lubrication Condition

The study has been performed concerning the influence of temperature field created by heat conduction between sample and the anvils, and the influence of lubrication condition (friction coefficient) on thermal mechanical compression test with numerical simulation, with regard to deformation resistance and distributions of strain and strain rate. The results show that temperature field has an effect on deformation resistance and distributions of strain and strain rate. That will influence on the results from thermal mechanical simulation tests. Further, the results also show that friction coefficient has no influence on deformation resistance, but the friction coefficient will result in uneven distribution of strain and strain rate.

Thermo-Physical Behaviour and Mechanical Properties of Experimentally Enhanced Rubberised Concrete Block

2014 ◽  
Vol 925 ◽  
pp. 169-174
Author(s):  
Khalid B. Najim ◽  
Ibrahim A. Al-Jumaily
Keyword(s):  
Mechanical Properties ◽  
Thermal Conductivity ◽  
Heat Capacity ◽  
Concrete Block ◽  
Crumb Rubber ◽  
Concrete Wall ◽  
Normal Concrete ◽  
Physical Behaviour ◽  
Concrete Blocks ◽  
Rubber Concrete

The aim of the presented study is to investigate the thermo-physical behaviour and mechanical properties of mortar pre-coated crumb rubber concrete block. For this purpose, thermal conductivity, emissivity and effusively will be tested in addition to the specific heat capacity. Thereafter, dynamic calculator software will be used to study the behaviour of a wall that constructed using the suggested concrete block and a comparison with a normal concrete wall will be made. Compressive, splitting tensile and flexural strength were tested as well. The results show that concrete blocks which meet the requirement of strength can be produced with about 300 kg/m3 of crumb rubber aggregate.

4501 The field test results of energy-saving type cooling system for low temperature energy use

2006 ◽  
Vol 2006.3 (0) ◽  
pp. 117-118
Author(s):  
Hiroki UEDA ◽  
Yasunori OKAMOTO ◽  
Hiroshi NODA ◽  
Kiyoshi MORIMURA
Keyword(s):  
Low Temperature ◽  
Energy Saving ◽  
Field Test ◽  
Energy Use ◽  
Cooling System ◽  
Test Results

Numerical Simulation of Hot Stamping of Front Bumper

2014 ◽  
Vol 912-914 ◽  
pp. 715-722
Author(s):  
Yi Hui Guo ◽  
Ming Tu Ma ◽  
Yi Sheng Zhang ◽  
Dian Wu Zhou ◽  
Lei Feng Song
Keyword(s):  
Numerical Simulation ◽  
Temperature Field ◽  
Field Distribution ◽  
Hot Stamping ◽  
Reference Value ◽  
Cooling Channel ◽  
Test Results ◽  
Temperature Field Distribution ◽  
Channel System ◽  
Calculate Temperature Field

LS-DYNA software was adopted to conduct research of numerical simulation on hot stamping of front bumper to calculate the temperature field distribution, stress field distribution, FLD figure and etc. of parts in the course of hot stamping so as to predict and analyze the formability of parts. ProCAST software was employed to conduct research of numerical simulation on solid quenching course concerning hot stamping to calculate temperature field distribution of tools and component of multiple stamping cycles; Based on the simulation,the hot stamping mould was developed,and the front bumper components of hot forming were stamped, Compared the test results with the simulation, both the results coincide basically with same variation trend .Results obtain from numerical simulation can provide significant reference value to hot stamping part design, formability predication and tools cooling channel system design.

scholarly journals Effect of La and Sc Co-Addition on the Mechanical Properties and Thermal Conductivity of As-Cast Al-4.8% Cu Alloys

Metals ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1866
Author(s):  
Zhao-Xi Song ◽  
Yuan-Dong Li ◽  
Wen-Jing Liu ◽  
Hao-Kun Yang ◽  
Yang-Jing Cao ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Thermal Conductivity ◽  
Heat Capacity ◽  
Specific Heat ◽  
Specific Heat Capacity ◽  
Grain Morphology ◽  
Cu Alloy ◽  
Average Grain Size ◽  
Sc Addition ◽  
Co Addition

The effects of La and La+Sc addition on mechanical properties and thermal conductivity of Al-4.8Cu alloy were comprehensively studied. The as-cast samples were characterized by optical microscopy (OM), scanning electron microscopy (SEM), X-ray diffraction (XRD) and first-principles methods. The results reveal that the grain morphology of Al-4.8Cu alloy changes from dendrite to fine equiaxed grain with La, La+Sc addition. The average grain size of Al-Cu-La (Al-4.8Cu-0.4La) and Al-Cu-La-Sc (Al-4.8Cu-0.4La-0.4Sc) decreased by 37.2% (70.36 μm) and 63.3% (119.64 μm) respectively compared with Al-Cu (Al-4.8Cu). Al-Cu-La has the highest elongation among the three which is 34.4% (2.65%) higher than Al-Cu. Al-Cu-La-Sc has the highest ultimate tensile strength and yield strength which are 55.1% (80.9 MPa) and 65.2% (62.1 MPa) higher than Al-Cu, respectively. The thermal conductivity of Al-Cu-La and Al-Cu-La-Sc is 10.0% (18.797 W·m−1·k−1) and 6.5% (12.178 W·m−1·k−1) higher than Al-Cu alloy respectively. Compared with Al-Cu, Al-Cu-La has less shrinkage and porosity, the presence of Al4La and AlCu3 contribute a lot to the decrease of specific heat capacity and the increase of plasticity and toughness. The porosity of Al-Cu-La-Sc does not significantly decrease compared with Al-Cu-La, the presence of Al3Sc and AlCuSc bring about the increase of specific heat capacity and brittleness.

Mechanical properties of welded joints of the pressed aluminum-magnesium 1565Ch alloy at low and high temperatures

2019 ◽  
pp. 57-67
Author(s):  
S. A. Zykov ◽  
V. I. Pavlova ◽  
E. P. Osokin
Keyword(s):  
Mechanical Properties ◽  
Elevated Temperature ◽  
Low Temperature ◽  
Base Metal ◽  
Welded Joints ◽  
Arc Welding ◽  
Cryogenic Temperature ◽  
Actual Strength ◽  
Temperature Hardening ◽  
Consumable Electrodes

The paper studies structure and mechanical properties of welded joints of hot-pressed panels and profiles manufactured by JSC Arkonik SMZ from aluminum-magnesium 1565ch alloy at the temperature range of –165 to 150°C. It is established that the nature of changes in the properties of welded joints of pressed panels and profiles of 1565ch alloy made by manual argon-arc welding with non-consumable electrodes of ArDS with filler material SwAMg-61 at various test temperatures is similar to changes of welded joints of rolled sheets. When the test temperature is lowered, low-temperature hardening of the welded joints takes place – at a cryogenic temperature (–165°C), 20–30% of strength is gained comparing to 20°C. The prolonged aging of welded joints at an elevated temperature (150°C) leads to strength decrease by 25–30% compared to that of 20°C. The coefficient of strength of welded joints with reinforced joint is not less than 0.9 of the actual strength of the base metal at all test temperatures.

Thermal and Mechanical Properties of Hf Hydrides with Various Hydrogen Content

2009 ◽  
Vol 1215 ◽  
Author(s):  
Ken Kurosaki ◽  
Masato Ito ◽  
Yuki Kitano ◽  
Hiroaki Muta ◽  
Masayoshi Uno ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Thermal Conductivity ◽  
Heat Capacity ◽  
Vickers Hardness ◽  
Temperature Effects ◽  
Room Temperature ◽  
Atomic Ratio ◽  
Thermal And Mechanical Properties ◽  
Shear Moduli ◽  
Delta Phase

AbstractFine bulk samples of delta-phase Hf hydride with various hydrogen contents (CH) ranging from 1.62 to 1.72 in the atomic ratio (H/Hf) were prepared, and their thermal and mechanical properties were characterized. In the temperature range from room temperature to around 650 K, the heat capacity and thermal diffusivity of the samples were measured and the thermal conductivity was evacuated. The elastic modulus was calculated from the measured sound velocity. The Vickers hardness was measured at room temperature. Effects of CH and/or temperature on the properties of Hf hydrides were discussed. At room temperature, the thermal conductivity values of the Hf hydrides were 23 Wm−1K−1. The Young's and shear moduli and the Vickers hardness of Hf hydride decreased with increasing CH.

Study on Vertical Earth Pressure of Slab Culvert under High Embankment

2012 ◽  
Vol 256-259 ◽  
pp. 1898-1902 ◽  
Author(s):  
Bao Kuan Ning ◽  
He Fan ◽  
Lei Gong ◽  
Guo Qing Liu
Keyword(s):  
Numerical Simulation ◽  
Boundary Conditions ◽  
Field Test ◽  
Structural Design ◽  
Earth Pressure ◽  
Test Results ◽  
Soil Pressure ◽  
Vertical Earth Pressure ◽  
The Impact ◽  
Good Agreement

With the increasing of embankment culvert engineering applications, there has been due in part to the structural design is too conservative and not economic or select unreasonable structural form, leading to the phenomenon of cracking or even collapse of the culvert structure, and the phenomenon has seriously affected the normal use of the highway. In this paper, the numerical simulation of vertical earth pressure distribution on different structural forms of embankment on culverts, to discuss the impact of boundary conditions, fill height, the thickness of the culvert culverts vertical earth pressure. Combined with Heda highway a culvert covert field test results and numerical simulation results were compared and analyzed. The results show that the numerical simulation and field test results in good agreement with the culvert structure in the form of vertical earth pressure of the embankment culverts have a greater impact; the structure of different forms of the culvert in the upper soil pressure is significantly different. In addition, analysis of the impact of boundary conditions, filling height of culvert vertical earth pressure values. The results can reference for the study of the structural design of the embankment culverts security.

scholarly journals Effect of Pore Structure on Thermal Conductivity and Mechanical Properties of Autoclaved Aerated Concrete

Materials ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 339
Author(s):  
Gonglian Chen ◽  
Fenglan Li ◽  
Pengfei Jing ◽  
Jingya Geng ◽  
Zhengkai Si
Keyword(s):  
Mechanical Properties ◽  
Thermal Conductivity ◽  
Compressive Strength ◽  
Pore Structure ◽  
Pore Size ◽  
Base Material ◽  
Test Results ◽  
Foam Stabilizer ◽  
Base Materials ◽  
Aerated Concrete

With the premise of investigating mechanical properties, the thermal conductivity of autoclaved aerated concrete (AAC) is a key index of self-insulation block walls for building energy conservation. This study focused on the effect of pore structures on the mechanical performance and thermal conductivity of AAC with the comparison of AAC base materials. Different kinds of AAC and their base materials were prepared and experimentally investigated. While maintaining a consistent mix proportion of the AAC base material, the pore structure of AAC was changed by the dosage of aluminum power/paste, foam stabilizer, and varying the stirring time of aluminum paste. The steam curing systems of AAC and the base material were determined based on SEM (Scanning Electronic Microscopy) and XRD (X-Ray Diffraction) tests. With almost the same apparent density, the pore size decreased with the increasing content of foam stabilizer, and the mixing time of aluminum paste and foam stabilizer has a great influence on pore size. The thermal conductivity test and compressive test results indicated that that pore size had an effect on the thermal conductivity, but it had little effect on the compressive strength, and the thermal conductivity of sand aeration AAC was 8.3% higher than that of fly ash aeration AAC; the compressive strength was 10.4% higher, too. With almost the same apparent density, the regression mathematical model indicates that the thermal conductivity of AAC increased gradually with the increase of pore size, but it had little effect on the compressive strength. From the test results of basic mechanical properties, the mechanical model of cubic compressive strength, elastic modulus, axial compressive strength, and splitting tensile strength was obtained. The proposed stress–strain relationship model could well describe the relationship of AAC and the base material at the rising section of the curve.

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