Joint investigation of the elasticity modulus and linear expansion coefficient of rocks at negative temperatures

1968 ◽  
Vol 4 (3) ◽  
pp. 301-303
Author(s):  
V. S. Yamshchikov ◽  
V. B. Dobretsov ◽  
A. E. Sukhanov ◽  
V. I. Gorodnichenko
Keyword(s):  
Expansion Coefficient ◽  
Elasticity Modulus ◽  
Linear Expansion ◽  
Linear Expansion Coefficient ◽  
Joint Investigation ◽  
Negative Temperatures

Influence of Crushed Basalt Aggregate on Crack Resistance of Concrete

2012 ◽  
Vol 253-255 ◽  
pp. 529-532
Author(s):  
Jian Jun Yan ◽  
Shi Hua Zhou ◽  
Shang Shi Peng
Keyword(s):  
Crack Resistance ◽  
Temperature Stress ◽  
Expansion Coefficient ◽  
Linear Expansion ◽  
Drying Shrinkage ◽  
Temperature Deformation ◽  
Linear Expansion Coefficient ◽  
Volume Deformation

The crack resistance of concrete with crushed basalt aggregate was studied. Compared with the limestone concrete, the basalt concrete has larger drying shrinkage and autogenous volume deformation. The linear expansion coefficient of basalt concrete is 1.3×10－6 /°C larger than that of limestone concrete, and it has additional temperature deformation of 24.1×10－6. According to the analysis on temperature-stress of concrete, the cracking temperature of basalt concrete is 8.9°C higher than that of limestone concrete, and the crack resistance of basalt concrete is unfavorable.

scholarly journals Technological Forecasting of Deformations in Flat Parts

2020 ◽  
Vol 3 (1) ◽  
pp. 1-12
Author(s):  
Tatiana N. Ivanova ◽  
Witold Biały ◽  
Jiři Fries ◽  
Victor Nordin
Keyword(s):  
Expansion Coefficient ◽  
Linear Expansion ◽  
Plate Thickness ◽  
Heat Removal ◽  
Quality Parameters ◽  
Grinding Wheel ◽  
Linear Expansion Coefficient ◽  
Plate Material ◽  
Thermal Deformations ◽  
Geometric Size

AbstractThe deformation of a part occurring in the process of grinding directly influences its exploitation and quality parameters. The instability of shape and size, which occurs due to an imbalance of residual stress, can be the one of the major causes of deformation of a part. The decrease in stress slows down the deformation process. Considering the regularities of heat source intensity dependence on the grinding modes, it can be asserted that with increasing grinding depth and grinding wheel hardness, the value increases and it decreases with a growth in a speed of the part and the use of cooling. The higher the heat removal is and the better lubricant properties of the liquid are, the more significant the decrease in is. Changing these values allows regulation of the residual stresses. As a result of the research on determination of deformations, it is recommended to reduce thermal deformations by considering the geometric size of a plate to be machined, linear expansion coefficient of plate material and an allowance for nonflatness from thermal deformations. The value of nonflatness from thermal deformations is directly proportional to linear expansion coefficient of plate material and its square overall dimensions. At the same time, the value of nonflatness is inversely proportional to the plate thickness.

Utilization of Doppler effect and laser heterodyne to measure linear expansion coefficient of metal

2018 ◽  
Vol 47 (7) ◽  
pp. 706005
Author(s):  
布音嘎日迪 Bu Yingaridi ◽  
仲维丹 Zhong Weidan ◽  
甄佳奇 Zhen Jiaqi ◽  
高亚臣 Gao Yachen ◽  
刘 勇 Liu Yong ◽  
...  
Keyword(s):  
Expansion Coefficient ◽  
Doppler Effect ◽  
Linear Expansion ◽  
Linear Expansion Coefficient ◽  
Laser Heterodyne

The Effect of Cable Material Characteristics on Suspendome

2010 ◽  
Vol 156-157 ◽  
pp. 1251-1255 ◽  
Author(s):  
Zhi Hua Chen ◽  
Guo Jun Sun ◽  
Zhan Sheng Liu
Keyword(s):  
Elastic Modulus ◽  
High Temperature ◽  
Low Temperature ◽  
Expansion Coefficient ◽  
Linear Expansion ◽  
Steel Structure ◽  
Linear Expansion Coefficient ◽  
Maximum Displacement ◽  
Material Characteristics ◽  
Prestressed Steel Structure

Cable is the key component in the prestressed steel structure. In order to study the effect of cable elastic modulus and expansion coefficient on the prestressed steel structure, Suspendome of Tianbao Center was taken as the research object and APDL language is applied to write a corresponding program, thereby carrying out analysis to the model; The results indicate that the change of cable expansion coefficient and cable elastic modulus have a different effect on the performance of the suspendome: at high temperature, the effect of the expansion coefficient of hoop cable and radial cable is larger on the maximum displacement; at low temperature, the effect of the elastic modulus of hoop cable is larger on the support constrained force. Therefore, it is necessary to give precise linear expansion coefficient and elastic modulus for different cables.

scholarly journals Advantages of using composite alloys for internal combustion engine pistons

2020 ◽  
Vol 55 (3) ◽  
pp. 85-94
Author(s):  
Mirosław Kowalski ◽  
Antoni Jankowski
Keyword(s):  
Heat Treatment ◽  
Tensile Strength ◽  
Abrasive Wear ◽  
Expansion Coefficient ◽  
Linear Expansion ◽  
Combustion Engine ◽  
High Temperature Strength ◽  
Linear Expansion Coefficient ◽  
The Novel ◽  
Coefficient Versus

Combustion engine pistons are subject to variable mechanical and thermal loads, and to variable deformations. The article presents the possibilities of using novel composite alloys for the construction of pistons for combustion engines. The novel alloys make it possible to meet high demands, especially for highly load designs, which practically cannot be met by conventional alloys used so far. These high requirements relate to the weight of the pistons, high temperature strength, alloy crystalline structure, abrasive wear resistance, dimensional stability. The requirements for pistons have an impact on the durability of the engine's operation, the level of noise emissions; exhaust gas blow-by into the crankcase, the level of emitted toxic exhaust components, mainly hydrocarbons. The research covered metallography (chemical composition, microstructure), material strength, abrasive wear, and thermal expansion. Investigations of the alloy crystallization process during casting were carried out using the Differential Thermal Analysis (DTA) method. The castings were used for metallographic tests. The strength of the samples was tested at room temperature (20° C) and elevated temperature (up to 350° C) on a testing machine equipped with a special climatic chamber. In particular, the article presents Thermal Derivative Analysis curves and representative microstructures of conventional AlSi12 alloy and the novel composite alloy; dependence of the tensile strength versus temperature for the samples of the novel alloy with various nickel content 2% and 4 %; comparison of the tensile strength for conventional alloy and the novel alloy at ambient and 250° C temperature; comparison of abrasive wear of samples, made of novel aluminium alloy and different cast iron; course of the linear expansion coefficient versus temperature for the conventional AlSi12 alloy with incorrect heat treatment; course of the linear expansion coefficient versus temperature for one of tested silumin alloy which expansion coefficient during sample cooling is smaller than during sample heating; course of the linear expansion coefficient versus temperature for the novel composite silumin alloy, after correct heat treatment. The great benefits of using this novel alloy and the introduction of novel alloying elements (in-Situ) have been confirmed in engine research.

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