压电元件由陶瓷制成，受力变形则会产生电力。
The piezoelectric elements contain ceramics that generate electricity on being deformed.
为保证套管安全，建立了准确描述套管受力变形的数学模型。
A mathematical model to describe casing deformation accurately has been built to ensure casing security.
根据应变协调条件，推导出了套管、水泥环及地层受力变形状态的计算公式。
According to strain coordination condition, the force and deformation state formulas of casing, cement loop and stratum are derived.
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