{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,4]],"date-time":"2026-06-04T23:14:27Z","timestamp":1780614867235,"version":"3.54.1"},"reference-count":27,"publisher":"MDPI AG","issue":"14","license":[{"start":{"date-parts":[[2024,7,13]],"date-time":"2024-07-13T00:00:00Z","timestamp":1720828800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Natural Science Foundation of Ningxia","award":["2023A0557"],"award-info":[{"award-number":["2023A0557"]}]},{"name":"Natural Science Foundation of Ningxia","award":["NYG2022057"],"award-info":[{"award-number":["NYG2022057"]}]},{"name":"Scientific Research Projects of Ningxia Higher Education Institutions","award":["2023A0557"],"award-info":[{"award-number":["2023A0557"]}]},{"name":"Scientific Research Projects of Ningxia Higher Education Institutions","award":["NYG2022057"],"award-info":[{"award-number":["NYG2022057"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Polymers"],"abstract":"<jats:p>In this paper, a comparative study of the mode-I fracture behaviors of two types of specimens with a V-notch defect under plane stress conditions was performed using the digital gradient sensing (DGS) method. First, two types of specimens (namely one-piece specimen and bonded specimen) with the same V-notch defect were both made of polymethyl methacrylate (PMMA), and three different V-notch angles\u2019 defect were considered for each type of specimen. Then, three-point bending tests were performed on both types of specimens. The angular deflection field of light near the V-notch region was recorded using a CCD during the experiments. Finally, by utilizing the relationship between the stress gradient and angular deflection as established by the elasto-optic effect, in conjunction with the principles of linear elastic fracture mechanics theory, the stress intensity factors (SIFs) of two types of specimens under different stress conditions were calculated using the least square method. According to the experimental results, the influence of V-notch angle on fracture load and fracture toughness of two kinds of specimens was discussed. Meanwhile, the experimental results show the significant differences in the fracture behaviors of the two types of specimens under mode-I loading conditions.<\/jats:p>","DOI":"10.3390\/polym16142011","type":"journal-article","created":{"date-parts":[[2024,7,15]],"date-time":"2024-07-15T08:35:17Z","timestamp":1721032517000},"page":"2011","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Experimental Study on Fracture Behavior of Adhesive-Bonded Structure with V-notch Based on Digital Gradient Sensing Method"],"prefix":"10.3390","volume":"16","author":[{"given":"Hai","family":"Yu","sequence":"first","affiliation":[{"name":"School of Civil Engineering, North Minzu University, Yinchuan 750021, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yangzhuang","family":"An","sequence":"additional","affiliation":[{"name":"School of Civil Engineering, North Minzu University, Yinchuan 750021, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yunpeng","family":"Liu","sequence":"additional","affiliation":[{"name":"School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2024,7,13]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"106802","DOI":"10.1016\/j.tws.2020.106802","article-title":"Damage and failure characteristics of CFRP\/aluminum single lap joints designed for lightweight applications","volume":"153","author":"Chen","year":"2020","journal-title":"Thin-Walled Struct."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"111559","DOI":"10.1016\/j.compstruct.2019.111559","article-title":"Shear strength of bonded joints of carbon fiber reinforced plastic (CFRP) laminates enhanced by a two-step laser surface treatment","volume":"232","author":"Xie","year":"2020","journal-title":"Compos. 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