Stressed state of a square sample for crack resistance tests of sheet materials

1982 ◽  
Vol 18 (3) ◽  
pp. 240-244 ◽  
Author(s):  
M. P. Savruk ◽  
S. Ya. Yarema ◽  
P. N. Osiv
Keyword(s):  
Stressed State ◽  
Crack Resistance ◽  
Sheet Materials ◽  
Resistance Tests

Modeling of the ductile-brittle transition in porous metallic materials under conditions of crack resistance tests

1990 ◽  
Vol 29 (5) ◽  
pp. 411-416 ◽  
Author(s):  
S. A. Firstov ◽  
Yu. N. Podrezov ◽  
L. G. Shtyka ◽  
A. G. Zherdin ◽  
A. A. Malyshenko
Keyword(s):  
Crack Resistance ◽  
Metallic Materials ◽  
Brittle Transition ◽  
Resistance Tests

Origin of two linear segments in the fracture diagram in crack resistance tests

1981 ◽  
Vol 13 (8) ◽  
pp. 980-984
Author(s):  
V. A. Volkov ◽  
A. S. Dukhovnyi
Keyword(s):  
Crack Resistance ◽  
Fracture Diagram ◽  
Resistance Tests

Method aspects of autoclave cyclic crack resistance tests of compact samples

1984 ◽  
Vol 20 (1) ◽  
pp. 70-72
Author(s):  
V. I. Pokhmurskii ◽  
I. P. Gnyp ◽  
A. A. Popov ◽  
G. P. Tarasyuk ◽  
I. Z. Dutsyak ◽  
...  
Keyword(s):  
Crack Resistance ◽  
Cyclic Crack Resistance ◽  
Resistance Tests

scholarly journals Thermal cracking resistance of stacking concrete blocks

2018 ◽  
Vol 245 ◽  
pp. 08005
Author(s):  
Albina Shaibakova ◽  
Kirill Semenov ◽  
Yurij Barabanshchikov
Keyword(s):  
Comparative Analysis ◽  
Stressed State ◽  
Crack Resistance ◽  
Concrete Structure ◽  
Concrete Block ◽  
Thermal Crack ◽  
Construction Period ◽  
Massive Concrete ◽  
Concrete Blocks ◽  
Thermally Stressed State

In massive concrete structures there is a danger of temperature cracks. One of the measures to get rid of these type of cracks is the breakdown of an array into concreting blocks. In this paper, we consider the provision of thermal crack resistance of a massive concrete structure during the construction period. A comparative analysis of the thermally stressed state of the structure erected by one and two blocks in height is carried out. The influence of the overlap intervals of the concrete block in the calculations of thermal crack resistance was evaluated. Thermal crack resistance is evaluated by the deformation criterion. The authors found that the breakdown of the concrete structure into concreting blocks reduces the elongation deformations by 37%. The results show that increasing the overlap interval of a concrete block more effectively ensures thermal crack resistance of the structure.

Measurement Fitness of Samples for Fatigue Crack Resistance Tests

Atomic Energy ◽  
2015 ◽  
Vol 118 (2) ◽  
pp. 108-116 ◽  
Author(s):  
V. Yu. Gol’tsev ◽  
V. M. Markochev
Keyword(s):  
Fatigue Crack ◽  
Crack Resistance ◽  
Resistance Tests

scholarly journals Comparison of influence of surfactants on thermokinetic characteristics of alkali-activated slag cement

2021 ◽  
Vol 6 (6 (114)) ◽  
pp. 39-48
Author(s):  
Pavlo Krivenko ◽  
Igor Rudenko ◽  
Oleksandr Konstantynovskyi
Keyword(s):  
Molecular Structure ◽  
Stressed State ◽  
Heat Release ◽  
Crack Resistance ◽  
Active Surface ◽  
Surface Active ◽  
Activated Slag ◽  
Thermally Stressed State ◽  
Alkali Activated ◽  
Active Substances

Increasing the durability of concrete and reinforced concrete structures according to the criterion of crack resistance is a relevant task of construction materials science. To solve this task, this paper proposes effective solutions for adjusting thermofinite characteristics of alkali-activated slag cement (ASC) by using surfactants of various chemical nature in order to control the thermally-stressed state of concrete based on it (ASC concrete). The method of calorimetry was applied to show that the problematic issue is to adjust the structure formation of ASC by anion-active surface-active substances based on complex polyesters. This is predetermined by the instability of the molecular structure of surfactants in the hydration environment of ASC due to the destruction of complex ester bonds as a result of alkaline hydrolysis. Thermokinetic analysis has demonstrated the effectiveness of using anion-active surfactants, which do not contain ester bonds, as regulators of crack resistance of ASC concrete. Simple polyesters and multi-atom alcohols provide the ability to adjust the duration of the induction period while ensuring the required completeness of ASC hydration within a time frame. The effectiveness of cation-active surface-active substances has been shown, which are characterized by the stability of the molecular structure in the hydration environment of ASC and an increased level of adsorbing capacity. The decrease in the effectiveness of surface-active substances has been shown, in terms of the effect on the heat release of ASC, in the following series: alkaline salt of carboxylic acid>salt of the quaternary ammonium compound>simple polyester> polyalcohol>complex polyester. The reported results are important in view of the possibility of effective adjustment of ASC heat release by influencing the structure formation of surfactant with a certain molecular arrangement in order to predictably reduce crack formation in a thermally-stressed state and a corresponding increase in the durability of structures

Electrochemical conditions at a crack tip in corrosion crack resistance tests of beam samples of 15Kh2MFA steel in an aqueous medium

1984 ◽  
Vol 20 (3) ◽  
pp. 270-276
Author(s):  
L. V. Ratych ◽  
I. N. Dmytrakh ◽  
B. T. Timofeev ◽  
S. A. Pusyak ◽  
V. A. Fedorova
Keyword(s):  
Crack Resistance ◽  
Aqueous Medium ◽  
Crack Tip ◽  
15Kh2mfa Steel ◽  
Corrosion Crack Resistance ◽  
Resistance Tests
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