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      Experimental Investigation of Impactor Diameter Effect on Low-Velocity Impact Response of CFRP Laminates in a Drop-Weight Impact Event

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          Abstract

          The present study delved into the effect of impactor diameter on low velocity impact response and damage characteristics of CFRP. Moreover, the phased array ultrasonic technique (PAUT) was adopted to identify the impact damages based on double-sided scanning. Low-velocity impact tests were carried out using three hemispherical impactors with different diameters. The relationship of impact response and impactor diameters was analyzed by ultrasonic C-scans and S-scans, combined with impact response parameters. Subsequently, the damage characteristics were assessed in terms of dent depth, delamination area and extension shape via the thickness, and the relationships between absorbed energy, impactor displacement, dent depth and delamination area were elucidated. As revealed from experiment results, double-sided PAUT is capable of representing the internal damage characteristics more accurately. Moreover, the impactor diameter slightly affects the impact response under small impact energy, whereas it significantly affects the impact response under large impact energy.

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          Most cited references32

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          Review of low-velocity impact properties of composite materials

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            A review of non-destructive testing methods of composite materials

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              Impact resistance and damage characteristics of composite laminates

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                Author and article information

                Journal
                Materials (Basel)
                Materials (Basel)
                materials
                Materials
                MDPI
                1996-1944
                17 September 2020
                September 2020
                : 13
                : 18
                : 4131
                Affiliations
                [1 ]School of Control Science and Engineering, Shandong University, Jinan 250061, China; caohongyi@ 123456mail.sdu.edu.cn (H.C.); mamengyuan@ 123456mail.sdu.edu.cn (M.M.); drleizhang@ 123456sdu.edu.cn (L.Z.); jialei@ 123456sdu.edu.cn (L.J.)
                [2 ]Zhongche Qingdao Sifang Locomotive and Rolling Stock Co., Ltd., Qingdao 266111, China; sfsunlin@ 123456aliyun.com (L.S.); sftianaiqin@ 123456sina.com (A.T.); sfliangjianying@ 123456sina.com (J.L.)
                Author notes
                Author information
                https://orcid.org/0000-0003-0937-4853
                https://orcid.org/0000-0002-0031-7409
                https://orcid.org/0000-0002-1049-4249
                Article
                materials-13-04131
                10.3390/ma13184131
                7560369
                32957526
                ff17f1c7-ffce-4676-baa3-87e05a0ae6f6
                © 2020 by the authors.

                Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license ( http://creativecommons.org/licenses/by/4.0/).

                History
                : 05 August 2020
                : 14 September 2020
                Categories
                Article

                composites,low-velocity impact,impact response,non-destructive testing,ultrasonic

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