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A critical step in these simulations is the development of constitutive models that accurately describe the tissue's mechanical behavior. In this work, we present a new constitutive model, which explicitly accounts for the gradual recruitment of collagen fibers. The recruitment is considered using an effective stretch, which is a continuum\u2010scale kinematic variable measuring the uncrimped stretch of the tissue in an average sense. The strain energy of a fiber bundle is described by a quadratic function of the effective strain. Constitutive models formulated in this manner are applied to describe the responses of ascending thoracic aortic aneurysm and porcine thoracic aorta tissues. The heterogeneous properties of the ATAA tissue are extracted from bulge inflation test data, and then used in finite element analysis to simulate the inflation test. The descriptive and predictive capabilities are further assessed using planar testing data of porcine thoracic aortic tissues. It is found that the constitutive model can accurately describe the stress\u2013strain relations. In particular, the finite element simulation replicates the displacement, strain, and stress distributions with excellent fidelity.<\/jats:p>","DOI":"10.1002\/cnm.3653","type":"journal-article","created":{"date-parts":[[2022,9,27]],"date-time":"2022-09-27T07:51:25Z","timestamp":1664265085000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Modeling planar response of vascular tissues using quadratic functions of effective strain"],"prefix":"10.1002","volume":"39","author":[{"given":"Xuehuan","family":"He","sequence":"first","affiliation":[{"name":"Department of Mechanical Engineering The University of Iowa  Iowa City Iowa USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5753-5362","authenticated-orcid":false,"given":"Jia","family":"Lu","sequence":"additional","affiliation":[{"name":"Department of Mechanical Engineering The University of Iowa  Iowa City Iowa 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