The research team of Zhejiang University has introduced a new formula for the buckling pressure of the disc head, which effectively improves the design accuracy of the pressure vessel.-Yixing Jiuzhou Head Forging Co., Ltd.

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The research team of Zhejiang University has introduced a new formula for the buckling pressure of the disc head, which effectively improves the design accuracy of the pressure vessel.

Release time:

2024-09-06

The research team of Zhejiang University has introduced a new formula for the buckling pressure of the disc head, which effectively improves the design accuracy of the pressure vessel.

Recently, the research team of Zhejiang University published an important paper entitled "New Formula for Calculating Buckling Pressure of Internal Pressure Saucer Head" in "Journal of Zhejiang University-SCIENCE A", and proposed a new calculation formula, which can more accurately predict the plastic buckling pressure of steel saucer head under internal pressure. This research result provides more accurate technical support for the field of pressure vessel design, and is expected to greatly improve the stability and reliability of industrial equipment.

The disc head is an important part of pressure vessel widely used in petrochemical, aerospace, food processing and other industries. Because it is prone to local buckling under internal pressure, how to accurately predict the buckling pressure has become a major problem in engineering design.

Most of the existing dished head buckling pressure calculation formulas are based on elastic theory or ideal elastic plasticity theory, ignoring the strain hardening effect and geometric nonlinearity of the material in the buckling process, which leads to significant deviations between the calculation results and the actual situation. The research team at Zhejiang University realized that only by introducing a more complex mathematical model, combined with the real stress-strain curve of the material, can the buckling pressure of the head be accurately predicted in theory. To this end, the research team first established a nonlinear finite element model based on the arc length method to simulate the buckling process of the steel dish head under internal pressure. Through the parametric study of various geometric parameters (such as diameter-thickness ratio, spherical crown radius and inner diameter ratio, transition zone radius and inner diameter ratio) and material parameters (such as yield strength and elastic modulus), they revealed the influence of these factors on the buckling pressure. On the basis of considering the material strain hardening and geometric nonlinearity, the formula is modified by fitting the finite element calculation results and combining with the buckling pressure experimental data of the actual industrial-scale head, which can more accurately reflect the buckling behavior of the head, and its calculation accuracy and application range are significantly better than the existing international standards and design formulas.

The research team confirmed the reliability of the new formula in engineering applications through a large number of experimental verification. The experimental results show that the error between the calculation results of the new formula and the actual measured buckling pressure is within the controllable range, and the average relative error is only 14%, which is much lower than the error level of the existing formula. This means that the formula has high application value in practical engineering design, which can help designers to evaluate the buckling performance of the head more accurately, thus greatly reducing the risk of buckling failure of the head during use. The research results not only have important theoretical significance, but also provide strong technical support for practical engineering design. By using this new formula, the designer can more accurately predict the buckling pressure of the head under extreme conditions when designing the pressure vessel, so as to optimize the structural design, reduce material waste and improve the reliability of the equipment. The new formula for calculating the buckling pressure of the steel dished head proposed by Zhejiang University breaks through the limitations of the traditional calculation method and provides a theoretical basis and technical support for the design and manufacture of pressure vessels.

Source: Ye Sheng, Li Keming, Zheng Jinyang, et al. A new formula for calculating the buckling pressure of internal pressure dished heads [J]. Journal of Zhejiang University-Science A(Applied Physics & Engineering),2024,25(08):618-631.

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