“…Moreover, the heat flux vector is determined by the same potential function that determines the stress. The Green-Naghdi theory has been studied in various papers (see, e.g., Chandrasekharaiah 1998;Hetnarski and Ignazack 1999;Quintanilla andStraughan 2000, 2004;Quintanilla 2003;Puri and Jordan 2004;Ieşan and Quintanilla 2009;Bargmann 2012 and references therein). The gradient theories of thermomechanics have been studied in various papers (see, e.g., Ahmadi and Firoozbakhsh, 1975;Ieşan, 1983Ieşan, , 2004Ieşan and Quintanilla, 1992;Ciarletta and Ieşan, 1993;Martinez and Quintanilla, 1998;Forest et al, 2000Forest et al, , 2002Forest and Amestoy, 2008;Forest and Aifantis, 2010).…”