Hydro-Thermal Fatigue of Polymer Matrix Composite Biomaterials

Pieniak, Daniel; Przystupa, Krzysztof; Walczak, Agata; Niewczas, A.; Krzyżak, Aneta; Bartnik, Grzegorz; Gil, L.; Lonkwic, P.

doi:10.3390/ma12223650

Cited by 21 publications

(18 citation statements)

References 58 publications

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“…The volumetric wear after aging only was the highest for the experimental material Ex-nano (G) and the lowest for the experimental material Ex-flow (G). Lower sliding wear values of flow-type composites compared to those of universal composites were also observed in the work [11]. The…”

Section: Sliding Wearsupporting

confidence: 68%

“…Fillings and other dental applications made of RBCs are exposed to oral factors [11]. One such factor is the cyclical thermal load caused by the wear from beverages and foods at different temperatures.…”

Section: Of 18mentioning

confidence: 99%

“…Wear truck images were made by a Phenom G2 Pro scanning electron microscope (Phenom-World BV, Eindhoven, Netherlands). The microscopic structure of the tested materials is presented in the paper [11].…”

Section: Filler Content (Wt %)mentioning

confidence: 99%

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Hardness and Wear Resistance of Dental Biomedical Nanomaterials in a Humid Environment with Non-Stationary Temperatures

Pieniak

Walczak

et al. 2020

Materials

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This study discusses a quantitative fatigue evaluation of polymer–ceramic composites for dental restorations, i.e., commercial material (Filtek Z550) and experimental materials Ex-nano (G), Ex-flow (G). Their evaluation is based on the following descriptors: microhardness, scratch resistance, and sliding wear. In order to reflect factors of environmental degradation conditions, thermal fatigue was simulated with a special computer-controlled device performing algorithms of thermocycling. Specimens intended for the surface strength and wear tests underwent 104 hydrothermal fatigue cycles. Thermocycling was preceded by aging, which meant immersing the specimens in artificial saliva at 37 °C for 30 days. Microhardness tests were performed with the Vickers hardness test method. The scratch test was done with a Rockwell diamond cone indenter. Sliding ball-on-disc friction tests were performed against an alumina ball in the presence of artificial saliva. A direct positive correlation was found between thermocycling fatigue and microhardness. The dominant mechanism of the wear of the experimental composites after thermocycling is the removal of fragments of the materials in the form of flakes from the friction surface (spalling). Hydrothermal fatigue is synergistic with mechanical fatigue.

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Section: Sliding Wearsupporting

confidence: 68%

Section: Of 18mentioning

confidence: 99%

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Hardness and Wear Resistance of Dental Biomedical Nanomaterials in a Humid Environment with Non-Stationary Temperatures

Pieniak

Walczak

et al. 2020

Materials

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“…These networks, consisting of many miniature nodes equipped with a low-power transceiver, microprocessor, and sensor, can connect global computer networks with the physical world [44][45][46]. The concept of wireless sensor networks has attracted the attention of many scientists, research institutes, and commercial organizations, which has provided a large flow of scientific work on this topic [47][48][49][50][51][52][53]. The integration of low-power wireless networking technologies such as (WSNs) and low-cost cameras and microphones has allowed the development of so-called WMSNs (Wireless Multimedia Sensor Networks) [54].…”

Section: Related Research On Network Traffic Analysis and Anomaly Detmentioning

confidence: 99%

A Software Deep Packet Inspection System for Network Traffic Analysis and Anomaly Detection

Song

Beshley

Przystupa

et al. 2020

Sensors

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In this paper, to solve the problem of detecting network anomalies, a method of forming a set of informative features formalizing the normal and anomalous behavior of the system on the basis of evaluating the Hurst (H) parameter of the network traffic has been proposed. Criteria to detect and prevent various types of network anomalies using the Three Sigma Rule and Hurst parameter have been defined. A rescaled range (RS) method to evaluate the Hurst parameter has been chosen. The practical value of the proposed method is conditioned by a set of the following factors: low time spent on calculations, short time required for monitoring, the possibility of self-training, as well as the possibility of observing a wide range of traffic types. For new DPI (Deep Packet Inspection) system implementation, algorithms for analyzing and captured traffic with protocol detection and determining statistical load parameters have been developed. In addition, algorithms that are responsible for flow regulation to ensure the QoS (Quality of Services) based on the conducted static analysis of flows and the proposed method of detection of anomalies using the parameter Hurst have been developed. We compared the proposed software DPI system with the existing SolarWinds Deep Packet Inspection for the possibility of network traffic anomaly detection and prevention. The created software components of the proposed DPI system increase the efficiency of using standard intrusion detection and prevention systems by identifying and taking into account new non-standard factors and dependencies. The use of the developed system in the IoT communication infrastructure will increase the level of information security and significantly reduce the risks of its loss.

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“…The load presence at a certain distance from restraint is a frequent case of structure effort. The load support through the stiffness of such subassemblies, e.g., a motor, on the shaft of which a wheel is located, is a quite common model of the structure [37][38][39]. The applicable model is presented in Figure 2 and Figure 3.…”

Section: A Numerical Model Of the Carrying Structure Versus A True Modelmentioning

confidence: 99%

Case Study of Support Frame Optimization Using a Distant Load

et al. 2020

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This article presents the results of the structure optimization for the power unit carrying frame of a friction lift by means of numerical calculations using the finite element method (FEM). Optimization analysis covered the frame structure. The analysis was focused on strength optimization with the use of a remote load and on manufacturing optimization with attention paid to the operating times necessary to complete the production process of the carrying frame subassemblies. The Solidworks simulation program was used to optimize the frame in terms of the strength criterion. The program allowed both quantitative and qualitative assessments of the frame material effort before and after optimization.

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Hydro-Thermal Fatigue of Polymer Matrix Composite Biomaterials

Cited by 21 publications

References 58 publications

Hardness and Wear Resistance of Dental Biomedical Nanomaterials in a Humid Environment with Non-Stationary Temperatures

Hardness and Wear Resistance of Dental Biomedical Nanomaterials in a Humid Environment with Non-Stationary Temperatures

A Software Deep Packet Inspection System for Network Traffic Analysis and Anomaly Detection

Case Study of Support Frame Optimization Using a Distant Load

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