Study of Crack Nucleation Using the Acoustic Emission Method

Khazgaliev, R. G.; Dil’mukhametova, A. M.; Astanin, V. V.; Safiullin, R. V.

doi:10.1007/s11182-015-0578-6

Cited by 2 publications

(1 citation statement)

References 2 publications

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“…Регламентированное соединение заготовок обшивки с заготовкой наполнителя обеспечивают с помощью противосварочного покрытия (ПСП), которое наносится на участки неподлежащие соединению [7,10]. Из литературы известно, что в основном используют составы покрытий на основе оксида иттрия (Y 2 O 3 ) и нитрида бора (BN) [7,15]. Выбор ПСП и процедура обработки материала с покрытием до ДС является важной задачей, поскольку от этого зависят не только механические свойства основного материала, но и образование дефектов сварных соединений в конструкциях.…”

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The role of stop-off material in three-layer corrugated structures made of titanium alloys

et al. 2021

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In the manufacture of three-layer corrugated structures made of titanium alloys by diffusion bonding followed by superplastic forming, stop-off materials are used. The use of stop-off material makes it possible to selectively connect sheet blanks with each other and, as a result, get a hollow structure with an internal set of stiffeners in the form of a corrugation. The effect of stop-off materials based on boron nitride and yttrium oxide on the structure and mechanical properties of the titanium alloy Ti-6Al-4V is studied. Special attention is paid to the influence of stop-off materials on the quality of solid-phase joints in a corrugated structure. It is shown that the stop-off material based on yttrium oxide leads to the least degradation of the mechanical properties of the titanium alloy. It is established that the quality of the design depends not only on the composition of the stop-off materials, but also on the procedure of its processing before diffusion bonding of blanks. The composition of stop-off materials as binders includes organic components that contain light elements: nitrogen, carbon, oxygen and hydrogen. The latter are known to be harmful impurities for titanium and its alloys, and their chemical interaction with titanium is sharply intensified at high temperatures. The traditional temperatures of diffusion bonding and superplastic forming of the Ti-6Al-4V alloy are in the range of 900 -950°C. Therefore, it is necessary to control and prevent the process of adsorption of hydrogen, nitrogen, oxygen and carbon atoms on the connected surfaces of titanium blanks, since this can have a noticeable effect on the quality of diffusion joints, will lead to defects, and the fatigue strength of the entire structure already depends on this.

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The role of stop-off material in three-layer corrugated structures made of titanium alloys

et al. 2021

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Risk Assessment of the Rockburst Intensity in a Hydraulic Tunnel Using an Intuitionistic Fuzzy Sets-TOPSIS Model

2022

Advances in Materials Science and Engineering

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Rockbursts pose a significant threat to the safety of construction workers during construction periods. Many factors control its occurrence. To evaluate the intensity level of rockburst in hydraulic tunnels accurately, the intuitionistic fuzzy sets-TOPSIS model is first introduced. And, the decisive matrix is constructed. Then, the weighed decisive matrix is calculated. Finally, the degree of membership at different levels regarding the rockburst intensity is obtained. According to the ranking sequence of the membership degree, the risk level that corresponds to the maximum membership degree is the final assessment level. The conclusions are drawn that assessing the level of rockburst intensity using the proposed method is feasible. Compared with the traditional method, the proposed model has sufficient usage of original data, minor information loss, and broader application. And, their judgments under inherent uncertainty in the proposed model can be conveyed. More significantly, the degree of indeterminacy can be handled adequately in the evaluation. The proposed method not only can deal with vague information but also ease our workload. The efficiency and accuracy can be improved. In total, it can provide a new route for the intensity prediction of rockburst in the future.

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Study of Crack Nucleation Using the Acoustic Emission Method

Cited by 2 publications

References 2 publications

The role of stop-off material in three-layer corrugated structures made of titanium alloys

The role of stop-off material in three-layer corrugated structures made of titanium alloys

Risk Assessment of the Rockburst Intensity in a Hydraulic Tunnel Using an Intuitionistic Fuzzy Sets-TOPSIS Model

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