Improvement of Certain Composite Structures’ Quality by the Ultrasonic Field

Nitoi, Dan Florin; Chivu, Oana; Bogdan, Florea; Semenescu, Augustin; Pasare, Vili; Dumitrascu, Constantin; Marcu, Dragoş-Florin

doi:10.3390/app16020781

Open AccessArticle

Improvement of Certain Composite Structures’ Quality by the Ultrasonic Field

by

Dan Florin Nitoi

^*

,

Oana Chivu

,

Florea Bogdan

,

Augustin Semenescu

,

Vili Pasare

,

Constantin Dumitrascu

and

Dragoş-Florin Marcu

Quality Engineering and Industrial Technologies Department, Faculty of Industrial Engineering and Robotics, National University of Science and Technology Politehnica Bucharest, Splaiul Independentei no. 313, 060042 Bucharest, Romania

^*

Author to whom correspondence should be addressed.

Appl. Sci. 2026, 16(2), 781; https://doi.org/10.3390/app16020781

Submission received: 28 October 2025 / Revised: 9 December 2025 / Accepted: 13 December 2025 / Published: 12 January 2026

(This article belongs to the Topic Numerical Simulation of Composite Material Performance)

Download

Browse Figures

Versions Notes

Abstract

This paper presents the activities carried out to improve the quality of certain composite structures by manufacturing them with the assistance of an ultrasonic field. As many composite materials use epoxy resins as base materials, an important problem was noted, namely their high curing time, as well as the problems of lack of adhesion and delamination, which are also known and experienced in the case of composite structures made with metallic materials as a support. The application of an ultrasonic field can successfully solve both problems. To demonstrate this improvement, the manufacturing of cylinders used in braking stands in the automotive industry was considered the main application. The proposed technology will be then extended to conveyor belts or to the manufacturing of other high-adhesion surfaces. This article presents the traditional method and the new ultrasonic field deposition technology. The design of the ultrasonic system is presented based on an analytical calculation, FEM modal analysis, followed by the construction of the ultrasonic system, as well as by bending tests and infrared thermography to demonstrate the advantages of presented method.

Keywords: composite; structures; ultrasonic; field; curing; time; delamination

Share and Cite

MDPI and ACS Style

Nitoi, D.F.; Chivu, O.; Bogdan, F.; Semenescu, A.; Pasare, V.; Dumitrascu, C.; Marcu, D.-F. Improvement of Certain Composite Structures’ Quality by the Ultrasonic Field. Appl. Sci. 2026, 16, 781. https://doi.org/10.3390/app16020781

AMA Style

Nitoi DF, Chivu O, Bogdan F, Semenescu A, Pasare V, Dumitrascu C, Marcu D-F. Improvement of Certain Composite Structures’ Quality by the Ultrasonic Field. Applied Sciences. 2026; 16(2):781. https://doi.org/10.3390/app16020781

Chicago/Turabian Style

Nitoi, Dan Florin, Oana Chivu, Florea Bogdan, Augustin Semenescu, Vili Pasare, Constantin Dumitrascu, and Dragoş-Florin Marcu. 2026. "Improvement of Certain Composite Structures’ Quality by the Ultrasonic Field" Applied Sciences 16, no. 2: 781. https://doi.org/10.3390/app16020781

APA Style

Nitoi, D. F., Chivu, O., Bogdan, F., Semenescu, A., Pasare, V., Dumitrascu, C., & Marcu, D.-F. (2026). Improvement of Certain Composite Structures’ Quality by the Ultrasonic Field. Applied Sciences, 16(2), 781. https://doi.org/10.3390/app16020781

Note that from the first issue of 2016, this journal uses article numbers instead of page numbers. See further details here.

Article Menu

Improvement of Certain Composite Structures’ Quality by the Ultrasonic Field

Abstract

Share and Cite

Article Metrics

Article Access Statistics

Further Information

Guidelines

MDPI Initiatives

Follow MDPI