Analysis of seizure-resistance-improvement mechanism of polymer additives by acoustic emission sensing

Hase, Alan; Morita, Miho; Onodera, Ko

doi:10.1016/j.triboint.2023.108441

Cited by 2 publications

(2 citation statements)

References 19 publications

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“…The chemical structural formula of common nondispersant PMA-based polymer additives is shown in Figure a. PMA-based additives are one of the most common oil-compatible polymer additives, and there have been several reports on their improvement of tribological properties. − [Note that the olefin copolymer (OCP)-based additives shown in Figure b were used for comparison in the mechanical response study described in the latter part of this paper. ]…”

Section: Experiments and Resultsmentioning

confidence: 99%

Adsorption Characteristics and Mechanical Responses of Lubricants Containing Polymer Additives under Fluid Lubrication with a Narrow Gap

Hirayama,

Yamashita,

Yamamoto

et al. 2024

Langmuir

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The adsorption behavior of poly(methyl acrylate) (PMA)-based polymer additives and their mechanical response under fluid lubrication in narrow gaps were investigated by using neutron reflectometry, microchannel devices, and the narrow gap viscometer. The surface adsorption layer formed by the polymer additive in a stationary field that was investigated by neutron reflectometry was only about 3 nm thick. On the other hand, when the sample oil containing the polymer additive was flowed into the microchannel device with channels about 500 nm deep, the adsorption layer grew over a long period of time and eventually formed a layer that appeared to be more than 100 nm thick. The mechanical response was measured during one-directional rotation with a constant gap length by using the narrow gap viscometer. The results showed that the effective viscosity increased in the low shear rate range. The same behavior was also observed in the reciprocating rotational tests, where the mechanical response showed a distinctive distortion only when the shear rate was low near 0 rpm. The results of the neutron reflectometer, incorporating the narrow gap viscometer, showed no effect of the rotational speed with regard to the structure of the homogeneous layer over a large area. However, the discrepancy between the reflectivity profile and the fitting curve became progressively more pronounced with time, confirming the formation of inhomogeneous structures with time. It is finally suggested that the inhomogeneous structure is due to the formation of local aggregates by PMA molecules, and it acts as flow resistance only in the low shear rate, resulting in an increase in effective viscosity.

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Section: Experiments and Resultsmentioning

confidence: 99%

Adsorption Characteristics and Mechanical Responses of Lubricants Containing Polymer Additives under Fluid Lubrication with a Narrow Gap

Hirayama,

Yamashita,

Yamamoto

et al. 2024

Langmuir

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“…Each AE signal contains rich information about the internal structure, defect properties, state changes, and damage evolution of the material. Research on the mechanisms of AE generation, signal propagation modes, detection methods, and analysis techniques for different materials under various conditions is thriving (Hase et al, 2023;Ma et al, 2023;Zhou et al, 2023). With the continuous improvement of detection equipment performance and the advancement of analysis techniques, AE technology, as a dynamic non-destructive testing method, has been applied in various fields, including petroleum, petrochemicals, power generation, aerospace, astronautics, metallurgy, railways, transportation, coal mining, construction, and mechanical manufacturing.…”

Section: Introductionmentioning

confidence: 99%

Study on the mechanical properties and acoustic emission signal characteristics of freezing pipe

Wang,

Ye,

Liu

2023

Front. Earth Sci.

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The increase in freezing depth requires thicker, stronger, and colder freezing walls, and various complex factors in deep strata greatly increase the risk of freezing pipe fracture. To address the phenomenon of freezing pipe fracture, this paper designs freezing pipe and joint mechanical performance experiments based on acoustic emission (AE) technology, mainly testing the deformation of freezing steel pipes and composite joints at normal and low temperatures, changes in load bearing capacity, and corresponding AE characteristics of the process. Additionally, the associated AE characteristics throughout the process will be analyzed. The ultimate goal is to establish a discriminative pattern for identifying the critical fracture of freezing pipes based on the analysis of AE signal characteristics in conjunction with mechanical properties. The sensitivity of the AE system under low-temperature conditions and the reliability of the test were tested through pencil lead break experiments, and saltwater noise detection experiments were conducted to prevent noise interference from low-temperature saltwater flow and pipe wall friction in the identification of crucial signals for freezing pipe fracture. This study provides a basis for identifying the deformation mechanics and fracture warning of freezing pipes through dynamic analysis of AE monitoring information.

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Analysis of seizure-resistance-improvement mechanism of polymer additives by acoustic emission sensing

Cited by 2 publications

References 19 publications

Adsorption Characteristics and Mechanical Responses of Lubricants Containing Polymer Additives under Fluid Lubrication with a Narrow Gap

Adsorption Characteristics and Mechanical Responses of Lubricants Containing Polymer Additives under Fluid Lubrication with a Narrow Gap

Study on the mechanical properties and acoustic emission signal characteristics of freezing pipe

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