随着棘轮应变的产生，直管圆截面变为椭圆截面。
Thecircular cross section turns into ellipse as the ratcheting strain accumulates.
针对套管的不同初始椭圆度建立了套管、水泥环、地层平面应变力学模型。
Casing, cement and formation plane strain mechanical model are established, considering casing with initial ovality.
椭圆纤芯保偏光纤光栅两个轴的温度灵敏度和应变灵敏度都相同。
Both axes of elliptical core PMF exhibit the same responses to temperature and strain.
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