Experimental Verification of Contact Acoustic Nonlinearity at Rough Contact Interfaces
When a longitudinal wave passes through a contact interface, second harmonic components are generated due to contact acoustic nonlinearity (CAN). The magnitude of the generated second harmonic is related to the contact state of the interface, of which a model has been developed using linear and nonl...
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MDPI AG
2021-05-01
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| Online Access: | https://www.mdpi.com/1996-1944/14/11/2988 |
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| author | Youngbeom Kim Sungho Choi Kyung-Young Jhang Taehyeon Kim |
| author_facet | Youngbeom Kim Sungho Choi Kyung-Young Jhang Taehyeon Kim |
| author_sort | Youngbeom Kim |
| collection | DOAJ |
| description | When a longitudinal wave passes through a contact interface, second harmonic components are generated due to contact acoustic nonlinearity (CAN). The magnitude of the generated second harmonic is related to the contact state of the interface, of which a model has been developed using linear and nonlinear interfacial stiffness. However, this model has not been sufficiently verified experimentally for the case where the interface has a rough surface. The present study verifies this model through experiments using rough interfaces. To do this, four sets of specimens with different interface roughness values (Ra = 0.179 to 4.524 μm) were tested; one set consists of two Al6061-T6 blocks facing each other. The second harmonic component of the transmitted signal was analyzed while pressing on both sides of the specimen set to change the contact state of the interface. The experimental results showed good agreement with the theoretical prediction on the rough interface. The magnitude of the second harmonic was maximized at a specific contact pressure. As the roughness of the contact surface increased, the second harmonic was maximized at a higher contact pressure. The location of this maximal point was consistent between experiments and theory. In this study, an FEM simulation was conducted in parallel and showed good agreement with the theoretical results. Thus, the developed FEM model allows parametric studies on various states of contact interfaces. |
| first_indexed | 2024-03-10T10:50:16Z |
| format | Article |
| id | doaj.art-ecd29e39014b41efa979e40a934ba444 |
| institution | Directory Open Access Journal |
| issn | 1996-1944 |
| language | English |
| last_indexed | 2024-03-10T10:50:16Z |
| publishDate | 2021-05-01 |
| publisher | MDPI AG |
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| series | Materials |
| spelling | doaj.art-ecd29e39014b41efa979e40a934ba4442023-11-21T22:17:32ZengMDPI AGMaterials1996-19442021-05-011411298810.3390/ma14112988Experimental Verification of Contact Acoustic Nonlinearity at Rough Contact InterfacesYoungbeom Kim0Sungho Choi1Kyung-Young Jhang2Taehyeon Kim3Department of Mechanical Convergence Engineering, Hanyang University, 222 Wangsimni-ro, Seongdong-gu, Seoul 04763, KoreaLANL-JBNU Engineering Institute-Korea, Jeonbuk National University, Jeonju-si 54896, Jeollabuk-do, KoreaSchool of Mechanical Engineering, Hanyang University, Seoul 04763, KoreaRadiation and Decommissioning Laboratory, KHNP-CRI, Daejeon 34101, KoreaWhen a longitudinal wave passes through a contact interface, second harmonic components are generated due to contact acoustic nonlinearity (CAN). The magnitude of the generated second harmonic is related to the contact state of the interface, of which a model has been developed using linear and nonlinear interfacial stiffness. However, this model has not been sufficiently verified experimentally for the case where the interface has a rough surface. The present study verifies this model through experiments using rough interfaces. To do this, four sets of specimens with different interface roughness values (Ra = 0.179 to 4.524 μm) were tested; one set consists of two Al6061-T6 blocks facing each other. The second harmonic component of the transmitted signal was analyzed while pressing on both sides of the specimen set to change the contact state of the interface. The experimental results showed good agreement with the theoretical prediction on the rough interface. The magnitude of the second harmonic was maximized at a specific contact pressure. As the roughness of the contact surface increased, the second harmonic was maximized at a higher contact pressure. The location of this maximal point was consistent between experiments and theory. In this study, an FEM simulation was conducted in parallel and showed good agreement with the theoretical results. Thus, the developed FEM model allows parametric studies on various states of contact interfaces.https://www.mdpi.com/1996-1944/14/11/2988interfacial stiffnesscontact acoustic nonlinearity (CAN)ultrasoniccontact conditionNDTlongitudinal wave |
| spellingShingle | Youngbeom Kim Sungho Choi Kyung-Young Jhang Taehyeon Kim Experimental Verification of Contact Acoustic Nonlinearity at Rough Contact Interfaces Materials interfacial stiffness contact acoustic nonlinearity (CAN) ultrasonic contact condition NDT longitudinal wave |
| title | Experimental Verification of Contact Acoustic Nonlinearity at Rough Contact Interfaces |
| title_full | Experimental Verification of Contact Acoustic Nonlinearity at Rough Contact Interfaces |
| title_fullStr | Experimental Verification of Contact Acoustic Nonlinearity at Rough Contact Interfaces |
| title_full_unstemmed | Experimental Verification of Contact Acoustic Nonlinearity at Rough Contact Interfaces |
| title_short | Experimental Verification of Contact Acoustic Nonlinearity at Rough Contact Interfaces |
| title_sort | experimental verification of contact acoustic nonlinearity at rough contact interfaces |
| topic | interfacial stiffness contact acoustic nonlinearity (CAN) ultrasonic contact condition NDT longitudinal wave |
| url | https://www.mdpi.com/1996-1944/14/11/2988 |
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