“…Rao Yarrapragada et al (2012) used the Windenburg equation, which was developed for homogeneous materials, to predict the critical buckling pressure of composite shells with equivalent stiffness moduli, and compared the results with NLFEM. It is not surprising that a lot of studies on cylindrical shells made of steel or composite materials have also been made in the literature (Jones, 2010;Bai et al, 2013a;Bai et al, 2013b;Smith et al, 2013;Bai et al, 2014;Guz et al, 2014;Abdel-Nasser et al, 2015;Lee et al, 2016;Xiong et al, 2017).…”