This paper presents experimental, analytical and numerical studies of testing O-rings specimens cut from an St 37 steel pipe. These studies are meant to determine the mechanical properties of the St 37 material and to predict the behavior of its pipes when subjected to internal pressure. This was done by applying transversely concentrated force on relatively small rings (outer diameter = 60.3 mm and the wall thickness = 3.9 mm) until the rupture of the ring. A universal tensile testing machine along with specially designed holders were used to measure the load-line displacement of the rings. In addition, formulas to determine the displacement of the loading pin were derived using the straight beam theory and the curved beam theory. Both elastic and plastic deformations were calculated and compared in the results. Furthermore, finite element analyses (FEA) were carried out using strain hardening material model, to obtain the full deformation behavior of the O-ring during testing until rupture. From the experimental results, it was possible to determine the material yield strength and modulus of elasticity. The analytically obtained results predicted the material modulus of elasticity which was in very good agreement with the published values. The FE analyses were able to predict the full behavior of the rings.

本文介绍了对从St 37钢管上切下的O形圈样品进行测试的实验，分析和数值研究。这些研究旨在确定St 37材料的机械性能，并预测其在承受内压时的行为。这是通过在较小的环（外径= 60.3 mm，壁厚= 3.9 mm）上施加横向集中力直至环破裂而完成的。一台万能拉伸试验机以及专门设计的支架被用于测量环的载荷线位移。此外，使用直梁理论和弯曲梁理论推导了确定加载销位移的公式。计算了弹性变形和塑性变形并在结果中进行了比较。此外，使用应变硬化材料模型进行有限元分析（FEA），以获取在测试过程中直至破裂的O形圈的全部变形行为。从实验结果可以确定材料的屈服强度和弹性模量。通过分析获得的结果预测了材料的弹性模量，该弹性模量与公布的值非常吻合。有限元分析能够预测环的完整行为。通过分析获得的结果预测了材料的弹性模量，该弹性模量与公布的值非常吻合。有限元分析能够预测环的完整行为。通过分析获得的结果预测了材料的弹性模量，该弹性模量与公布的值非常吻合。有限元分析能够预测环的完整行为。