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First principal strain in the cervix and LUS under the assumptions of an attached fetal membrane and a detached fetal membrane with no friction. In both cases, the IUP is set to the level experienced in a uterine contraction during labor. Detachment of the fetal membrane before delivery increases the mechanical load on the cervix, inducing deformation. Simulations use the random continuous fiber model for the cervix, with IUP=8.6 kPa (typical peak contraction value).
