{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,9]],"date-time":"2026-01-09T14:39:56Z","timestamp":1767969596000,"version":"3.49.0"},"reference-count":34,"publisher":"MDPI AG","issue":"2","license":[{"start":{"date-parts":[[2026,1,9]],"date-time":"2026-01-09T00:00:00Z","timestamp":1767916800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"FEDER and National Funds","award":["PTDC\/EME-EME\/7678\/2020"],"award-info":[{"award-number":["PTDC\/EME-EME\/7678\/2020"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Materials"],"abstract":"<jats:p>Rapid characterization of high-cycle fatigue behaviour is of great interest, since conventional methods for developing S-N curves for longer fatigue lives are both costly in time and financial resources. Ultrasonic fatigue testing offers a promising alternative by enabling S-N curve evaluation in a fraction of the time, often hundreds of times faster, due to its high testing frequencies. Nevertheless, this technique presents specific challenges, including material overheating and limitations in specimens\u2019 geometry. Most ultrasonic fatigue studies employ hourglass specimens; however, this geometry restricts the testing of sheets and thin-walled components, which are increasingly used for their reduced mass and high stiffness-to-mass ratio. To overcome this limitation, the present work introduces a methodology for designing and testing flat specimens and corresponding gripping systems tailored to such components. The procedure is demonstrated for an aluminium alloy (6082), and preliminary experimental fatigue results are presented and compared with literature.<\/jats:p>","DOI":"10.3390\/ma19020273","type":"journal-article","created":{"date-parts":[[2026,1,9]],"date-time":"2026-01-09T11:45:33Z","timestamp":1767959133000},"page":"273","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Specimen Design and Characterization for Thin-Walled Components in Very-High-Cycle Fatigue Regime: Aluminium 6082 Case Study"],"prefix":"10.3390","volume":"19","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-7352-8637","authenticated-orcid":false,"given":"Felipe","family":"Klein Fiorentin","sequence":"first","affiliation":[{"name":"Department of Mobility Engineering, UFSC (Federal University of Santa Catarina), Joinville 89219-600, Brazil"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1983-2451","authenticated-orcid":false,"given":"Rita","family":"Dantas","sequence":"additional","affiliation":[{"name":"Institute of Science and Innovation in Mechanical and Industrial Engineering, Campus da FEUP, Dr. Roberto Frias Street, 4200-465 Porto, Portugal"},{"name":"Faculty of Engineering, University of Porto, Dr. Roberto Frias Street, 4200-465 Porto, Portugal"},{"name":"Institute for Sustainable Construct, 4200-465 Porto, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5225-8084","authenticated-orcid":false,"given":"Jorge","family":"Wolfs Gil","sequence":"additional","affiliation":[{"name":"Faculty of Engineering, University of Porto, Dr. Roberto Frias Street, 4200-465 Porto, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8615-7612","authenticated-orcid":false,"given":"Aida Beatriz","family":"Moreira","sequence":"additional","affiliation":[{"name":"Faculty of Engineering, University of Porto, Dr. Roberto Frias Street, 4200-465 Porto, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0009-0002-0370-8031","authenticated-orcid":false,"given":"Francisco","family":"Matos","sequence":"additional","affiliation":[{"name":"Institute of Science and Innovation in Mechanical and Industrial Engineering, Campus da FEUP, Dr. Roberto Frias Street, 4200-465 Porto, Portugal"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8864-5879","authenticated-orcid":false,"given":"Andrea","family":"Piga Carboni","sequence":"additional","affiliation":[{"name":"Department of Mobility Engineering, UFSC (Federal University of Santa Catarina), Joinville 89219-600, Brazil"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2559-7574","authenticated-orcid":false,"given":"Thiago Antonio","family":"Fiorentin","sequence":"additional","affiliation":[{"name":"Department of Mobility Engineering, UFSC (Federal University of Santa Catarina), Joinville 89219-600, Brazil"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1059-715X","authenticated-orcid":false,"given":"Ab\u00edlio Manuel Pinho","family":"de Jesus","sequence":"additional","affiliation":[{"name":"Institute of Science and Innovation in Mechanical and Industrial Engineering, Campus da FEUP, Dr. Roberto Frias Street, 4200-465 Porto, Portugal"},{"name":"Faculty of Engineering, University of Porto, Dr. Roberto Frias Street, 4200-465 Porto, Portugal"}]}],"member":"1968","published-online":{"date-parts":[[2026,1,9]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"1217","DOI":"10.1111\/ffe.13885","article-title":"Historical review and future prospect for researches on very high cycle fatigue of metallic materials","volume":"46","author":"Sakai","year":"2023","journal-title":"Fatigue Fract. Eng. Mater. Struct."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"1065","DOI":"10.1126\/science.abn0392","article-title":"On the origins of fatigue strength in crystalline metallic materials","volume":"377","author":"Stinville","year":"2022","journal-title":"Science"},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"233","DOI":"10.1016\/j.jmst.2020.08.038","article-title":"A practical model for efficient anti-fatigue design and selection of metallic materials: I. Model building and fatigue strength prediction","volume":"70","author":"Liu","year":"2021","journal-title":"J. Mater. Sci. Technol."},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"550","DOI":"10.1080\/00423114.2022.2051567","article-title":"An innovative stepwise time-domain fatigue methodology to integrate damage tolerance into system dynamics","volume":"61","author":"Guo","year":"2023","journal-title":"Veh. Syst. Dyn."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"2919","DOI":"10.1111\/ffe.13567","article-title":"Very high cycle fatigue (VHCF) response of additively manufactured materials: A review","volume":"44","author":"Caivano","year":"2021","journal-title":"Fatigue Fract. Eng. Mater. Struct."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"559","DOI":"10.1046\/j.1460-2695.1999.00183.x","article-title":"There is no infinite fatigue life in metallic materials","volume":"22","author":"Bathias","year":"1999","journal-title":"Fatigue Fract. Eng. Mater. Struct."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"1101","DOI":"10.1016\/S0142-1123(03)00147-6","article-title":"An understanding of very high cycle fatigue of metals","volume":"25","author":"Marines","year":"2003","journal-title":"Int. J. Fatigue"},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"140692","DOI":"10.1016\/j.msea.2020.140692","article-title":"Relationship between non-inclusion induced crack initiation and microstructure on fatigue behavior of bainite\/martensite steel in high cycle fatigue\/very high cycle (HCF\/VHCF) regime","volume":"803","author":"Gui","year":"2021","journal-title":"Mater. Sci. Eng. A"},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"1763","DOI":"10.1111\/ffe.13958","article-title":"Fatigue behavior and lifetime assessment of an austenitic stainless steel in the VHCF regime at ambient and elevated temperatures","volume":"46","author":"Schopf","year":"2023","journal-title":"Fatigue Fract. Eng. Mater. Struct."},{"key":"ref_10","doi-asserted-by":"crossref","unstructured":"England, A., Toumpis, A., and Gorash, Y. (2023). Very high cycle fatigue of welds: A review. Metals, 13.","DOI":"10.3390\/met13111860"},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"106146","DOI":"10.1016\/j.ijfatigue.2021.106146","article-title":"A novel high-frequency fatigue testing methodology for small thin-walled structures in the HCF\/VHCF regime","volume":"146","author":"Himmelbauer","year":"2021","journal-title":"Int. J. Fatigue"},{"key":"ref_12","doi-asserted-by":"crossref","unstructured":"Bathias, C., and Paris, P.C. (2004). Gigacycle Fatigue in Mechanical Practice, CRC Press.","DOI":"10.1201\/9780203020609"},{"key":"ref_13","doi-asserted-by":"crossref","unstructured":"Klein Fiorentin, F., Reis, L., Lesiuk, G., Reis, A., and de Jesus, A. (2023). A predictive methodology for temperature, heat generation and transfer in gigacycle fatigue testing. Metals, 13.","DOI":"10.3390\/met13030492"},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"108297","DOI":"10.1016\/j.ijfatigue.2024.108297","article-title":"Effects of temperature gradients on thermomechanical fatigue of nickel-based superalloy","volume":"184","author":"Xu","year":"2024","journal-title":"Int. J. Fatigue"},{"key":"ref_15","doi-asserted-by":"crossref","unstructured":"Klein Fiorentin, F., Dantas, R., Gil, J.W., Piga Carboni, A., Fiorentin, T.A., and de Jesus, A.M.P. (2025). On the Specimen Design, Physical Properties and Geometry Effect on Heat Generation and Thermal Gradient in Ultrasonic Fatigue. Machines, 13.","DOI":"10.3390\/machines13050380"},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"107925","DOI":"10.1016\/j.ijfatigue.2023.107925","article-title":"Notch effect in very high-cycle fatigue behaviour of a structural steel","volume":"177","author":"Dantas","year":"2023","journal-title":"Int. J. Fatigue"},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"231","DOI":"10.1111\/ffe.14466","article-title":"Study of Vibration-Ultrasonic Combined Fatigue on 7075-T6 Aluminum Alloy","volume":"48","author":"Zhao","year":"2025","journal-title":"Fatigue Fract. Eng. Mater. Struct."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"1438","DOI":"10.1016\/j.ijfatigue.2005.09.020","article-title":"Piezoelectric fatigue testing machines and devices","volume":"28","author":"Bathias","year":"2006","journal-title":"Int. J. Fatigue"},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"68","DOI":"10.1016\/j.ijfatigue.2014.01.007","article-title":"Very high cycle fatigue of copper: Evolution, morphology and locations","volume":"63","author":"Phung","year":"2014","journal-title":"Int. J. Fatigue"},{"key":"ref_20","unstructured":"Tofique, M.W., Bergstr\u00f6m, J., Hallb\u00e4ck, N., and Burman, C. (2018, January 15\u201318). Fatigue initiation and strength of duplex stainless steel strip specimens in the very high cycle fatigue regime. Proceedings of the 6th International Conference on VHCF, Chengdu, China."},{"key":"ref_21","doi-asserted-by":"crossref","unstructured":"Kurpiel, S., Zag\u00f3rski, K., Cie\u015blik, J., Skrzypkowski, K., and Brostow, W. (2023). Evaluation of the vibration signal during milling vertical thin-walled structures from aerospace materials. Sensors, 23.","DOI":"10.3390\/s23146398"},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"187","DOI":"10.1016\/j.apm.2024.04.050","article-title":"Multi-level structural optimization of thin-walled sections in steel\/aluminum vehicle body skeletons","volume":"132","author":"Li","year":"2024","journal-title":"Appl. Math. Model."},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"23","DOI":"10.1299\/mej.23-00491","article-title":"Study on post-buckling crack propagation in thin-walled cylinders under dynamic cyclic load","volume":"11","author":"Ye","year":"2024","journal-title":"Mech. Eng. J."},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"106048","DOI":"10.1016\/j.engfailanal.2022.106048","article-title":"A brief note on monotonic and fatigue fracture events investigation of thin-walled tubular austenitic steel specimens via fracture surface topography analysis (FRASTA)","volume":"134","author":"Macek","year":"2022","journal-title":"Eng. Fail. Anal."},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"293","DOI":"10.1016\/j.matpr.2022.08.242","article-title":"A review study on fatigue behavior of aluminum 6061 T-6 and 6082 T-6 alloys welded by MIG and FS welding methods","volume":"74","author":"Arunakumara","year":"2023","journal-title":"Mater. Today Proc."},{"key":"ref_26","doi-asserted-by":"crossref","unstructured":"Chen, B.Q., Liu, K., and Xu, S. (2024). Recent advances in aluminum welding for marine structures. J. Mar. Sci. Eng., 12.","DOI":"10.3390\/jmse12091539"},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"146974","DOI":"10.1016\/j.msea.2024.146974","article-title":"Effect of T6 heat treatment on microstructure and mechanical properties of 6082 aluminum alloy automotive flange components formed by squeeze casting","volume":"912","author":"Jiang","year":"2024","journal-title":"Mater. Sci. Eng. A"},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"123734","DOI":"10.1016\/j.matchemphys.2020.123734","article-title":"Microstructure characterization and mechanism of fatigue crack propagation of 6082 aluminum alloy joints","volume":"257","author":"Meng","year":"2021","journal-title":"Mater. Chem. Phys."},{"key":"ref_29","doi-asserted-by":"crossref","unstructured":"Dimitrov, D.M., Slavov, S.D., Mincheva, D.Y., and Cavadas, A.M. (2025). Ultrasonic Resonance Fatigue Testing of 6082 Aluminum Alloy. Metals, 15.","DOI":"10.3390\/met15020127"},{"key":"ref_30","unstructured":"Peliteiro, D.A.R. (2023). Giga-Cycle Fatigue Behavior of High Pressure Die-Casting Aluminum Alloys. [Master\u2019s Thesis, Universidade do Porto]."},{"key":"ref_31","unstructured":"(2019). Aluminium and Aluminium Alloys\u2014Chemical Composition and Form of Wrought Products\u2014Part 3: Chemical Composition and Form of Products (Standard No. EN 573-3)."},{"key":"ref_32","unstructured":"(2018). Metallic Materials\u2014Vickers Hardness Test\u2014Part 1: Test Method (Standard No. ISO 6507-1)."},{"key":"ref_33","doi-asserted-by":"crossref","unstructured":"Sarafoglou, P.I., Serafeim, A., Fanikos, I.A., Aristeidakis, J.S., and Haidemenopoulos, G.N. (2019). Modeling of microsegregation and homogenization of 6xxx Al-alloys including precipitation and strengthening during homogenization cooling. Materials, 12.","DOI":"10.3390\/ma12091421"},{"key":"ref_34","doi-asserted-by":"crossref","first-page":"116225","DOI":"10.1016\/j.jmatprotec.2019.05.006","article-title":"An experimental investigation of the drawability of AA6082 sheet under different elevated temperature forming processes","volume":"273","author":"Zheng","year":"2019","journal-title":"J. Mater. Process. Technol."}],"container-title":["Materials"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/1996-1944\/19\/2\/273\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2026,1,9]],"date-time":"2026-01-09T11:47:51Z","timestamp":1767959271000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/1996-1944\/19\/2\/273"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2026,1,9]]},"references-count":34,"journal-issue":{"issue":"2","published-online":{"date-parts":[[2026,1]]}},"alternative-id":["ma19020273"],"URL":"https:\/\/doi.org\/10.3390\/ma19020273","relation":{},"ISSN":["1996-1944"],"issn-type":[{"value":"1996-1944","type":"electronic"}],"subject":[],"published":{"date-parts":[[2026,1,9]]}}}