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Following <jats:italic>Borden et al. (2014)<\/jats:italic>, two distinct types of phase-field functional are considered: (i) a second-order model and (ii) a fourth-order one. The latter approach involves the bi-Laplacian of the phase field and therefore the resulting Galerkin form requires continuously differentiable basis functions: a condition we easily fulfill <jats:italic>via<\/jats:italic> Isogeometric Analysis. In this work, we provide an extensive comparison of the considered formulations performing several tests that progressively increase the complexity of the crack patterns. To measure the fracture length necessary in our accuracy evaluations, we propose an image-based algorithm that features an automatic skeletonization technique able to track complex fracture patterns. In all numerical results, damage irreversibility is handled in a straightforward and rigorous manner using the Projected Successive Over-Relaxation algorithm that is suitable to be adopted for both phase-field formulations since it can be used in combination with higher continuity isogeometric discretizations. Based on our results, the fourth-order approach provides higher rates of convergence and a greater accuracy. Moreover, we observe that fourth- and second-order models exhibit a comparable accuracy when the former methods employ a mesh-size approximately two times larger, entailing a substantial reduction of the computational effort.<\/jats:p>","DOI":"10.1007\/s00366-024-01949-5","type":"journal-article","created":{"date-parts":[[2024,3,14]],"date-time":"2024-03-14T08:45:39Z","timestamp":1710405939000},"page":"3541-3560","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":25,"title":["Higher order phase-field modeling of brittle fracture via isogeometric analysis"],"prefix":"10.1007","volume":"40","author":[{"given":"Luigi","family":"Greco","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Alessia","family":"Patton","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Matteo","family":"Negri","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Alessandro","family":"Marengo","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Umberto","family":"Perego","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0639-7067","authenticated-orcid":false,"given":"Alessandro","family":"Reali","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2024,3,14]]},"reference":[{"issue":"582\u2013593","key":"1949_CR1","doi-asserted-by":"publisher","first-page":"163","DOI":"10.1098\/rsta.1921.0006","volume":"221","author":"AA Griffith","year":"1921","unstructured":"Griffith AA, Taylor GI (1921) Vi the phenomena of rupture and flow in solids. 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