Effect of stressed-state form on failure kinetics and crack resistance in martensitic-aging steel. 1. Study of the failure process stages

1991 ◽  
Vol 23 (8) ◽  
pp. 833-843 ◽  
Author(s):  
A. A. Lebedev ◽  
N. G. Chausov ◽  
L. V. Zaitseva
Keyword(s):  
Stressed State ◽  
Crack Resistance ◽  
Failure Process ◽  
Aging Steel ◽  
State Form

Effect of the stressed-state form on the failure kinetics and crack resistance of martensitic-aging steel. 2. Evaluation of the crack resistance of steel

1991 ◽  
Vol 23 (8) ◽  
pp. 844-849 ◽  
Author(s):  
A. A. Lebedev ◽  
N. G. Chausov ◽  
L. V. Zaitseva
Keyword(s):  
Stressed State ◽  
Crack Resistance ◽  
Aging Steel ◽  
State Form

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

Determination of short-term macrostrength and crack resistance of orthotropic composite materials in a complex stressed state

1992 ◽  
Vol 28 (1) ◽  
pp. 43-52
Author(s):  
M. V. Delyavskii ◽  
L. T. Berezhnitskii ◽  
L. I. Onyshko
Keyword(s):  
Composite Materials ◽  
Stressed State ◽  
Crack Resistance ◽  
Complex Stressed State ◽  
Short Term ◽  
Orthotropic Composite

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.

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

scholarly journals Experimental Study on Basalt Fiber Crack Resistance of Asphalt Concrete Based on Acoustic Emission

Materials ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4096
Author(s):  
Kang Yang ◽  
Zhaoyi He ◽  
Dongxue Li ◽  
Hao Xu ◽  
Lin Kong
Keyword(s):  
Acoustic Emission ◽  
Crack Resistance ◽  
Asphalt Concrete ◽  
Failure Process ◽  
Resistance Mechanism ◽  
Basalt Fiber ◽  
Load Resistance ◽  
Average Frequency ◽  
Tensile Failure ◽  
Cracking Mode

In this study, the semicircle three-point bending tests of ordinary asphalt concrete and basalt fiber asphalt concrete were carried out and acoustic emission parameters were collected during the test. The differences of the characteristics of acoustic emission parameters between basalt fiber asphalt concrete and ordinary asphalt concrete were analyzed, and the damage stages were divided based on the variation of acoustic emission parameters; Rise Angle and Average Frequency were introduced to study the cracking mode and crack resistance mechanism of asphalt concrete with basalt fiber. The results show that the acoustic emission parameters can well represent the toughening and crack resistance effect of basalt fiber in asphalt concrete, and the damage stages can be divided into three stages: microcrack initiation stage, fracture stage, and residual stage. The duration of the fracture stage and the load resistance time of the specimen were greatly prolonged. The proportion of shear events in the whole failure process increased greatly after the basalt fibers were added, especially in the fracture stage, which reduced the tensile failure tendency of the specimens, and thus improved the bending and tensile performance of the specimens and played a toughening and crack resistance role in the fracture stage.

Study on Cracking Resistance of Concrete Reinforced with Rib Stiffened Steel Plates

2014 ◽  
Vol 624 ◽  
pp. 596-603
Author(s):  
Xiao Dong Wang ◽  
Xie Dong Zhang ◽  
Jin Zhi Wang ◽  
Zhi Xiang Zhou
Keyword(s):  
Crack Resistance ◽  
Composite Structure ◽  
Steel Plate ◽  
Failure Process ◽  
Local Area ◽  
Steel Plates ◽  
Tension Stress ◽  
Test Results ◽  
Flexural Members ◽  
Stiffened Steel

Aimed at the question of excessive tension stress in local area in concrete structure, a ribbed steel plate-concrete composite structure (RSPC) which can improve crack resistance and prevent crack developing was proposed. Four specimens of RSPC flexural members were designed to be compared with common concrete flexural members. The test results show that RSPC, which cracks appeared in upper limb, have much more crack resistance ability than common concrete flexural members. According to energy absorption principle in failure process of composite materials, the crack mechanism of RSPC composite structure was studied.

Effect of Plastic Deformation on Hydrogen Induced Crack Resistance of API X65 Linepipe Steel

2016 ◽  
Vol 54 (4) ◽  
pp. 295-303 ◽  
Author(s):  
Kyung-Mox Cho ◽  
Joon-Ho Sung ◽  
Yun-Kyu Kim ◽  
Jong-Geol Moon ◽  
Ki-Won Kim ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Crack Resistance ◽  
Linepipe Steel
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