International Journal of Pressure Vessels and Piping最新文献_第2页

Predicting creep life of CrMo pressure vessel steel using machine learning models with optimal feature subset selection 使用优化特征子集选择的机器学习模型预测铬钼压力容器钢的蠕变寿命

IF 3 2区工程技术 Q2 ENGINEERING, MECHANICAL

International Journal of Pressure Vessels and Piping

Pub Date : 2024-10-28 DOI: 10.1016/j.ijpvp.2024.105349

Mengyu Chai , Yuhang He , Junjie Wang , Zichuan Wu , Boyu Lei

The data-driven approach for creep life prediction typically integrates numerous characteristics, including material compositions, manufacturing details, and service conditions, into machine learning models. In this study, a machine learning-based creep life prediction approach with optimal feature subset selection is established for 2.25Cr1Mo pressure vessel steel. Before model training and testing, six critical features that significantly impact the creep life of 2.25Cr1Mo steel are selected, specifically the applied stress, temperature, and chemical compositions consisting of Cr, Ni, Mn, and Mo. Various machine learning algorithms, along with the traditional L–M method, are utilized for model training and performance evaluation. Additionally, the developed models undergo validation using experimental data independent of the training and testing datasets to assess their generalization abilities. The results reveal that, among all tested models, the support vector regression (SVR) model, coupled with the optimal feature subset, demonstrates superior prediction accuracy and generalization capability. Finally, the creep life prediction model exhibiting optimal performance is deployed into a software application, leveraging the Python programming language. This predictor tool facilitates rapid and precise creep life predictions for 2.25Cr1Mo pressure vessel steel, relying solely on a limited amount of input information, and provides a clear and visual presentation of the prediction results.

数据驱动的蠕变寿命预测方法通常将材料成分、制造细节和使用条件等众多特征整合到机器学习模型中。本研究针对 2.25Cr1Mo 压力容器钢建立了基于机器学习的蠕变寿命预测方法，并对特征子集进行了优化选择。在模型训练和测试之前，选择了对 2.25Cr1Mo 钢蠕变寿命有重大影响的六个关键特征，特别是应用应力、温度以及由 Cr、Ni、Mn 和 Mo 组成的化学成分。利用各种机器学习算法和传统的 L-M 方法进行模型训练和性能评估。此外，还使用独立于训练和测试数据集的实验数据对所开发的模型进行验证，以评估其泛化能力。结果表明，在所有测试模型中，支持向量回归（SVR）模型与最佳特征子集相结合，显示出更高的预测精度和泛化能力。最后，利用 Python 编程语言将表现出最佳性能的蠕变寿命预测模型部署到软件应用程序中。该预测工具仅依靠有限的输入信息，就能对 2.25Cr1Mo 压力容器钢进行快速、精确的蠕变寿命预测，并能清晰、直观地展示预测结果。

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引用次数: 0

Experimental study of natural fiber Jute reinforced by metal wires and its using as patch on semi-elliptical defected of the API X52 pipelines corroded according to ratio a/t 用金属丝加固天然纤维黄麻并将其用作 API X52 管道按 a/t 比腐蚀的半椭圆形缺陷补丁的实验研究

IF 3 2区工程技术 Q2 ENGINEERING, MECHANICAL

International Journal of Pressure Vessels and Piping

Pub Date : 2024-10-26 DOI: 10.1016/j.ijpvp.2024.105346

Zahi Messaoud, Madjid Meriem-Benziane

The aim of this study is to evaluate the efficiency of a hybrid patch of Jute with/without Glass fiber reinforced with Steel wire for repairing defective API X52 pipeline. Five specimens were tested using Jute fiber, Glass fiber and Steel wire to enhance the mechanical properties according to ASTM 3039 and D790 standards. The experimental results showed that the effects of hybrid materials (synthetic and natural) for repairing API X52 pipeline defect depend on the nature of the patch and the properties of the adhesive (polyester resin) by increasing the tensile strength and bending load. In the first step, specimen S5 was selected due to its distinctive mechanical properties, which revealed maximum values of tensile strength, toughness and bending load respectively 47,42014 MPa, 2357,42 kJ m⁻³ and 488,3 N. In the second step, the selected sample (S5) was used as a patch to repair API X52 pipeline, which has semi-elliptical defects where the bending load is 31.4246 kN. According to the obtained results, the patch efficiency is 103 % for defects with a/t < (0,3), which can be, restored 100 % of the mechanical properties. Therefore, repairing API X52 pipeline using hybrid patch (Jute reinforced with Steel wires) with shallower defects can be a successful technique.

本研究的目的是评估用钢丝增强的黄麻（含/不含玻璃纤维）混合补丁修复有缺陷的 API X52 管道的效率。根据 ASTM 3039 和 D790 标准，使用黄麻纤维、玻璃纤维和钢丝对五个试样进行了测试，以提高其机械性能。实验结果表明，混合材料（合成材料和天然材料）修复 API X52 管道缺陷的效果取决于补丁的性质和粘合剂（聚酯树脂）的性能，可提高拉伸强度和弯曲载荷。第一步，选择试样 S5，因为它具有独特的机械性能，其拉伸强度、韧性和弯曲载荷的最大值分别为 47,42014 兆帕、2357,42 千焦 m-3 和 488,3 牛。根据所得结果，对于 a/t < (0,3) 的缺陷，修补效率为 103%，可以 100% 恢复机械性能。因此，使用混合修补剂（黄麻加固钢丝）修复 API X52 管道较浅的缺陷是一项成功的技术。

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引用次数: 0

Determination of the Gurson-Tvergaard-Needleman damage model parameters for simulating small punch tests of heat-resistant alloys 确定用于模拟耐热合金小冲压试验的 Gurson-Tvergaard-Needleman 损伤模型参数

IF 3 2区工程技术 Q2 ENGINEERING, MECHANICAL

International Journal of Pressure Vessels and Piping

Pub Date : 2024-10-24 DOI: 10.1016/j.ijpvp.2024.105348

Qiwen Li , Lei Zhao , Xun Wang , Lianyong Xu , Yongdian Han

The small punch (SP) test is utilized to assess the mechanical characteristics and damage progression of heat-resistant alloys. The inverse finite element analysis method incorporating SP tests is a parameter identification method based on adjusting the accuracy of the simulated load-displacement curves. In this paper, the elastoplastic parameters of the Hollomon model and the damage parameters of the Gurson-Tvergaard-Needleman (GTN) model are determined based on the undamaged and damaged stages of the load-displacement curves, respectively. The whole stress-strain curves of the tested materials are then built using the results of finite element simulations of the tensile specimens of ZG15Cr2Mo1, P91, 316H, and Hastelloy X at room and elevated temperatures. Comparison with uniaxial tensile tests indicates that the simulated stress-strain curves closely resemble the experimental data from the tensile testing. In addition, the simulated damage evolution characteristics of the SP specimens are consistent with the mechanical model based on the actual deformation behavior. It is possible to comprehend the damage evolution process by analyzing the SP specimens’ stress and strain change characteristics.

小冲压（SP）试验可用于评估耐热合金的机械特性和损伤进展。结合 SP 试验的反有限元分析方法是一种基于调整模拟载荷-位移曲线精度的参数识别方法。本文根据载荷-位移曲线的未损坏阶段和损坏阶段，分别确定了 Hollomon 模型的弹塑性参数和 Gurson-Tvergaard-Needleman (GTN) 模型的损坏参数。然后，利用 ZG15Cr2Mo1、P91、316H 和哈氏合金 X 拉伸试样在室温和高温下的有限元模拟结果，建立了测试材料的整体应力-应变曲线。与单轴拉伸试验的比较表明，模拟应力-应变曲线与拉伸试验的实验数据非常相似。此外，SP 试样的模拟损伤演变特征与基于实际变形行为的力学模型一致。通过分析 SP 试样的应力和应变变化特征，可以理解损伤演变过程。

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引用次数: 0

Structural integrity assessment of pipe elbows: Burst test and finite element analysis 管道弯头的结构完整性评估：爆破试验和有限元分析

IF 3 2区工程技术 Q2 ENGINEERING, MECHANICAL

International Journal of Pressure Vessels and Piping

Pub Date : 2024-10-24 DOI: 10.1016/j.ijpvp.2024.105339

Suria Devi Vijaya Kumar , Saravanan Karuppanan , Veeradasan Perumal , Mark Ovinis

In this study, the failure pressures of pipe elbows were compared with those predicted using Level 3 numerical assessment method (Finite Element Method). Four 90-degree pipes elbows representing a pristine pipe, a pipe with a single corrosion defect, a pipe with longitudinally aligned interacting defects, and a pipe with a circumferentially aligned interacting defects, were subjected to internal pressure based on the ASME B31.3–2012 Burst Test standard until failure. The Sch-80 pipes were made of ASTM A234 WPB steel with a wall thickness and bending radius of 12.7 mm and 305 mm respectively. The corrosion defects were simulated on the exterior surface of the pipe elbows using computer numerical control (CNC) machine to generate a machined version of the corrosion defect. The results revealed that corrosion defects significantly reduce the burst pressure of pipe elbows, with longitudinally aligned interacting defects causing the largest reduction of 20.9 % compared to pristine pipe. The comparison between the Level 3 numerical assessment method and burst test showed close agreement with a maximum difference of 4.79 %, confirming the accuracy and reliability of the numerical method.

在这项研究中，管道弯头的失效压力与使用三级数值评估方法（有限元法）预测的失效压力进行了比较。根据 ASME B31.3-2012 爆破试验标准，对四根 90 度弯管进行了内压试验，直至其失效，这四根弯管分别代表原始管材、带有单一腐蚀缺陷的管材、带有纵向排列的相互作用缺陷的管材和带有圆周排列的相互作用缺陷的管材。Sch-80 管道由 ASTM A234 WPB 钢制成，壁厚和弯曲半径分别为 12.7 毫米和 305 毫米。使用计算机数控（CNC）机床在弯管外表面模拟腐蚀缺陷，生成腐蚀缺陷的机加工版本。结果显示，腐蚀缺陷显著降低了弯管的爆破压力，与原始管道相比，纵向排列的相互作用缺陷导致的爆破压力降低幅度最大，达到 20.9%。三级数值评估方法与爆破试验之间的比较显示两者接近，最大差异为 4.79%，证实了数值方法的准确性和可靠性。

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引用次数: 0

Study on low temperature and narrow heating bands of post weld heat treatment for girth welds stress reduction of long-distance pipelines 降低长输管道环缝焊缝应力的低温窄加热带焊后热处理研究

IF 3 2区工程技术 Q2 ENGINEERING, MECHANICAL

International Journal of Pressure Vessels and Piping

Pub Date : 2024-10-23 DOI: 10.1016/j.ijpvp.2024.105347

Shengyuan Niu, Xueda Li, Congyue Liu, Liying Li, Tao Han, Bin Han

Residual stress affects the service safety of pipelines, but there are few efficient methods to reduce the residual stress, especially for long-distance pipelines with large diameters. In this paper, a Secondary Post Weld Heat Treatment (S-PWHT) stress reduction method with low temperature and two narrow heating bands is proposed, and this method fully considers the failure of the corrosion resistance layer caused by high temperature. The temperature distribution and stress distribution under different S-PWHT parameters are compared to obtain the optimal S-PWHT parameters using finite element numerical simulation. The thermocouples are conducted to verify the temperature, and the coercivity experiment is used to verify the stress distribution. Results show that two heating bands width of 80 mm and a peak temperature of 120 °C are the optimal S-PWHT parameters with the stress reduced by 61 %. Besides, the levels of stress reduction on the inner surface and the HAZ are higher than those on the outer surface and the base metal, respectively. The high-stress zone is transferred from the inner surface to the outer surface, and from the HAZ to the base metal. Furthermore, the stress reduction mechanism of S-PWHT has been revealed through constraint theory. Temperature change is the initial force, and the constraint is the driving force for stress reduction.

残余应力会影响管道的使用安全，但目前几乎没有有效的方法来降低残余应力，尤其是对于大直径的长输管道。本文提出了一种采用低温和两个窄加热带的二次焊后热处理（S-PWHT）应力降低方法，该方法充分考虑了高温导致的防腐层失效。通过比较不同 S-PWHT 参数下的温度分布和应力分布，利用有限元数值模拟获得了最佳 S-PWHT 参数。通过热电偶实验验证温度，通过矫顽力实验验证应力分布。结果表明，两个加热带宽度为 80 毫米，峰值温度为 120 °C，是最佳的 S-PWHT 参数，应力降低了 61%。此外，内表面和热影响区的应力降低水平分别高于外表面和基体金属。高应力区从内表面转移到外表面，从 HAZ 转移到基体金属。此外，还通过约束理论揭示了 S-PWHT 的应力降低机制。温度变化是初始力，约束是应力降低的驱动力。

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引用次数: 0

Tracking research on the performance changes of S31042 steel under long term service S31042 钢在长期使用条件下的性能变化跟踪研究

IF 3 2区工程技术 Q2 ENGINEERING, MECHANICAL

International Journal of Pressure Vessels and Piping

Pub Date : 2024-10-15 DOI: 10.1016/j.ijpvp.2024.105344

Xianxi Xia , Xiao Jin , Qinzheng Ma , Baoyin Zhu , Yanwei Zhang , Jun Wang , Zhilin Chen , Lukuan Yang , Gaocan Luan , Yangyang Fu

S31042 is widely used in ultra-supercritical units due to its excellent comprehensive performance at high temperatures. Tracking and monitoring research was conducted on as-received S31042 tubes and tubes in service for 13 k hours, 31 k hours, and 52 k hours at 650 °C. The results show that as the service time increased, a large quantity of M₂₃C₆ phase precipitated along the grain boundaries, gathered and grew up into the bulk. This weakened of the grain boundaries, which facilitated crack propagation and significantly reduced the plasticity and toughness of the S31042 heat-resistant steel. After 13 k hours of operation, the dispersion strengthening of the precipitated phase inside the grain and grain boundary led to a substantial increase in hardness, while there was no obvious change in strength. However, after 52 k hours of operation, the dispersed precipitated phase within the grain slowly aggregated and grew, decreasing the effectiveness of dispersion strengthening. Consequently, both the high-temperature strength and hardness of the S31042 steel gradually decreased. As the service time increased, the continuously distributed and similarly sized M₂₃C₆ phases on the grain boundaries of S31042 developed into an inhomogeneous coarsening chain structure. Additionally, the appearance of nanoscale secondary NbCrN and M₂₃C₆ phases within the grain and their resulting precipitation strengthening effects were the main reasons for the significant change in S31042 hardness values. Based on these findings, the residual life of S31042 heat-resistant steel in service was predicted using an extrapolation method based on high-temperature creep rupture tests and the relationship model between hardness and the P function. A comparison of the L-M parametric life prediction results with the strength extrapolation life prediction results based on the standard creep rupture test shows that the creep rupture strength extrapolation method is slightly conservative. Therefore, the prediction results based on the hardness L-M parameter method, which is simple and easy to perform, can be used for preliminary life prediction.

由于 S31042 在高温下具有出色的综合性能，因此被广泛用于超超临界装置。我们对 S31042 管材的原样和在 650 ℃ 下使用 13 千小时、31 千小时和 52 千小时的管材进行了跟踪和监测研究。结果表明，随着服役时间的延长，大量 M23C6 相沿晶界析出，聚集并增长到管体中。这削弱了晶界，促进了裂纹扩展，并显著降低了 S31042 耐热钢的塑性和韧性。工作 13 k 小时后，晶粒和晶界内析出相的分散强化导致硬度大幅提高，而强度没有明显变化。然而，在工作 52 k 小时后，晶粒内的分散析出相缓慢聚集和增长，降低了分散强化的效果。因此，S31042 钢的高温强度和硬度都逐渐下降。随着使用时间的延长，S31042 晶界上连续分布且大小相似的 M23C6 相发展成不均匀的粗化链结构。此外，晶粒内纳米级次生 NbCrN 和 M23C6 相的出现及其产生的沉淀强化效应是 S31042 硬度值发生显著变化的主要原因。根据这些发现，采用基于高温蠕变断裂试验和硬度与 P 函数关系模型的外推法预测了 S31042 耐热钢在使用中的残余寿命。将 L-M 参数寿命预测结果与基于标准蠕变断裂试验的强度外推法寿命预测结果进行比较后发现，蠕变断裂强度外推法略显保守。因此，基于硬度 L-M 参数法的预测结果简单易行，可用于初步寿命预测。

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引用次数: 0

Enhanced elastic stress solutions for junctions in various pipe bends under internal pressure and combined loading (90° pipe bend, U-bend, double-bend pipe) 在内部压力和组合荷载（90° 弯管、U 形弯管、双弯管）作用下，各种弯管连接处的增强弹性应力解决方案

IF 3 2区工程技术 Q2 ENGINEERING, MECHANICAL

International Journal of Pressure Vessels and Piping

Pub Date : 2024-10-14 DOI: 10.1016/j.ijpvp.2024.105343

Seok-Pyo Hong , Seok-Jun Yoon , Dong-Jun Kim , Yun-Jae Kim , Nam-Su Huh

Piping systems in nuclear power plants normally operate under high pressure and high temperature. To efficiently manage space within these systems, pipe bends are extensively used. However, the welded joints connecting these pipes may be susceptible to flaws due to weld residual stress, transient loads, and operating environments. When flaws are present in such areas, analytical evaluation of flaws is to be carried out based on fracture mechanics parameters such as stress intensity factor. To calculate the stress intensity factor, distributions of the elastic stress are required. Therefore, this paper presents closed-form approximations of elastic stress in the junction between a pipe bend and a straight pipe under internal pressure. Review of the existing elastic stress solutions for estimating the stresses in pipe bends was carried out analyzing their limitations. Based on those limitations elastic stress solutions for thick to thin wall pipe bends were proposed and were validated against finite element (FE) analysis for thick-wall to thin-wall pipe bends under internal pressure and combined loading (i.e. internal pressure, in-plane bending, out-of-plane bending inflicted simultaneously).

90 °

pipe bend, U-bend and double-bend pipe configurations were considered and showed good agreement with the FE results exhibiting less than 5.8 % discrepancies. The accuracy of the elastic stress solutions for pipe bends provided in the existing code are summarized and validated in the appendix as well.

核电站的管道系统通常在高压和高温下运行。为了有效管理这些系统中的空间，弯管被广泛使用。然而，由于焊接残余应力、瞬态载荷和运行环境的影响，连接这些管道的焊接接头可能容易出现缺陷。当这些区域出现缺陷时，需要根据应力强度因子等断裂力学参数对缺陷进行分析评估。要计算应力强度因子，需要弹性应力的分布。因此，本文提出了内压作用下弯管与直管交界处弹性应力的闭式近似值。本文回顾了用于估算弯管应力的现有弹性应力解决方案，分析了其局限性。根据这些局限性，提出了厚壁弯管到薄壁弯管的弹性应力解决方案，并与内部压力和组合加载（即内部压力、平面内弯曲和平面外弯曲同时施加）下的厚壁弯管到薄壁弯管的有限元（FE）分析进行了验证。考虑了 90° 弯管、U 形弯管和双弯管结构，结果显示与 FE 结果的一致性良好，差异小于 5.8%。附录中还总结并验证了现有规范中提供的弯管弹性应力解决方案的准确性。

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引用次数: 0

A dual-channel convolutional neural network with attention mechanism DC_EcaNet-6 for creep life prediction of notched components 具有注意机制的双通道卷积神经网络 DC_EcaNet-6 用于缺口部件的蠕变寿命预测

IF 3 2区工程技术 Q2 ENGINEERING, MECHANICAL

International Journal of Pressure Vessels and Piping

Pub Date : 2024-10-12 DOI: 10.1016/j.ijpvp.2024.105341

Zhou Zheng, Jian-Guo Gong, Zhi Liu, Fu-Zhen Xuan

Machine learning models offer novel possibilities for creep life prediction of materials and components at elevated temperatures. Present studies primarily focus on material-level creep life prediction, with limited reports on component-level analysis due to the complex stress states around structural discontinuities. Based on this, a dual-channel convolutional neural network with attention mechanism, DC_EcaNet-6, is proposed for creep life prediction of notched components, where the images of Mises stress and stress tri-axiality are employed as the input. The prediction results by the DC_EcaNet-6 model are compared with that by some deep learning models and the simplified method. Creep reliability assessment of notched components using the DC_EcaNet-6 model is conducted. The results indicate that the proposed model provides a more superior creep life prediction accuracy of notched components than other models mentioned. This model provides a potential tool for creep life prediction and reliability assessment of notched components.

机器学习模型为材料和部件在高温下的蠕变寿命预测提供了新的可能性。目前的研究主要集中在材料层面的蠕变寿命预测，由于结构不连续性周围的应力状态复杂，对部件层面分析的报道有限。在此基础上，提出了一种具有注意机制的双通道卷积神经网络 DC_EcaNet-6，用于缺口部件的蠕变寿命预测，其中采用了米塞斯应力和应力三轴性图像作为输入。将 DC_EcaNet-6 模型的预测结果与一些深度学习模型和简化方法的预测结果进行了比较。利用 DC_EcaNet-6 模型对缺口部件进行了蠕变可靠性评估。结果表明，与其他模型相比，所提出的模型能提供更高的缺口部件蠕变寿命预测精度。该模型为缺口部件的蠕变寿命预测和可靠性评估提供了一个潜在的工具。

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引用次数: 0

Fracture studies on cruciform bend specimens of pressure vessel steel subjected to thermo-mechanical loading 受热机械载荷作用的压力容器钢十字形弯曲试样的断裂研究

IF 3 2区工程技术 Q2 ENGINEERING, MECHANICAL

International Journal of Pressure Vessels and Piping

Pub Date : 2024-10-11 DOI: 10.1016/j.ijpvp.2024.105342

Thamaraiselvi Kumaresan , S. Vishnuvardhan

The safety of a nuclear power plant during incidents, such as a Loss of Coolant Accident (LOCA), heavily relies on conducting a comprehensive structural integrity assessment of both the Reactor Pressure Vessel (RPV) and its components, specifically to withstand Pressurized Thermal Shock (PTS). PTS is characterized by a combination of steep temperature gradient, resulting from the injected emergency coolant during a LOCA, and internal pressure within the RPV. Majority of the reported fracture assessment studies on RPV steel, whether experimental or numerical investigations, have predominantly focused on standard uniaxial specimens at iso-thermal loading conditions. To better simulate the thermal shock scenario in RPVs, the present work aims to assess the impact of a biaxial stress field on both fracture parameters (crack mouth opening displacement and J-integral) and plastic collapse load. This assessment is conducted through experimental and numerical investigations, both with and without prior transient thermal load. Fracture experiments are performed on cruciform bend specimens, featuring two different biaxiality ratios (1:1 and 2:1). Moreover, numerical studies on cruciform specimens are conducted using finite element analysis to validate and corroborate the observations derived from the fracture experiments.

核电厂在发生冷却剂损失事故（LOCA）等事件时的安全，主要依赖于对反应堆压力容器（RPV）及其组件进行全面的结构完整性评估，特别是在承受加压热冲击（PTS）方面。PTS 的特点是 LOCA 期间注入的紧急冷却剂造成的陡峭温度梯度与 RPV 内部压力的结合。所报道的大多数 RPV 钢断裂评估研究，无论是实验研究还是数值研究，都主要侧重于等温加载条件下的标准单轴试样。为了更好地模拟 RPV 中的热冲击情况，本研究旨在评估双轴应力场对断裂参数（裂口张开位移和 J 积分）和塑性塌陷载荷的影响。这项评估是通过实验和数值研究进行的，既有事先的瞬态热负荷，也有事先没有热负荷的情况。断裂实验在十字形弯曲试样上进行，具有两种不同的双轴比（1:1 和 2:1）。此外，还利用有限元分析对十字形试样进行了数值研究，以验证和证实从断裂实验中得出的观察结果。

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引用次数: 0

Theoretical and experimental research on the critical buckling pressure of the thin-walled metal liner installed in the composite overwrapped pressure vessel 复合材料包覆压力容器中薄壁金属内衬临界屈曲压力的理论和实验研究

IF 3 2区工程技术 Q2 ENGINEERING, MECHANICAL

International Journal of Pressure Vessels and Piping

Pub Date : 2024-10-05 DOI: 10.1016/j.ijpvp.2024.105335

Pei Zhang , Fuwei Gu , Zhongliang Cao , Hao Wang , Zhiyang Chen , Hu Xiao , Xinkun Wang , Guoliang Ma

Composite overwrapped pressure vessels (COPVs) are widely used in the field of high-pressure gas storage and transportation because of their light weight and high strength. In engineering, autofrettage is usually used to improve the fatigue life of composite pressure overwrapped vessels with metal liners. However, excessive pressure of autofrettage could cause buckling damage to the metal liner. In order to determine the upper limit of autofrettage (critical buckling pressure) and analyze its influence on the safety factor of COPVs, a theoretical calculation model of the critical buckling pressure about the metal liner was established based on classical laminated plate theory and the confined buckling theory. Then, a COPV with thin-walled welded metal liner was prepared by fiber winding process. In order to monitor and judge the buckling damage mode of the liner, the circumferential strain of the COPV's cylinder was measured by loading and unloading step-by-step. Finally, the influence of materials and dimensions of the metal liner on the pressure ratio (the ratio of the first layer failure pressure to the critical buckling pressure of the COPV's metal liner) was discussed. When the diameter to thickness ratio (R/t) of the metal liner was greater than 35, the pressure ratios of the 6063-T5 aluminum alloy liner and the S30408 stainless steel liner both exceeded 2.25. However, the pressure ratio of 6061-T6 aluminum alloy liner with R/t ≤ 60 was lower than 1.85, which shows that the metal liner with higher yield strength and lower elastic modulus has higher utilization rate of fiber winding layers. Due to the fact that the current design standards only ensure the reliability of COPVs through safety factors and various type testing with their evaluation methods, the proposed theoretical calculation method can reduce the uncertainty of COPVs during the design and testing rounds.

复合材料包覆压力容器（COPV）因其重量轻、强度高而被广泛应用于高压气体储运领域。在工程设计中，通常使用自动涂漆来提高带金属内衬的复合材料包覆压力容器的疲劳寿命。然而，过高的自动修整压力可能会导致金属内衬屈曲损坏。为了确定自润滑的上限（临界屈曲压力）并分析其对 COPV 安全系数的影响，基于经典层压板理论和约束屈曲理论，建立了关于金属内衬临界屈曲压力的理论计算模型。然后，通过纤维缠绕工艺制备了带有薄壁焊接金属内衬的 COPV。为了监测和判断内衬的屈曲破坏模式，通过逐步加载和卸载测量了 COPV 筒体的圆周应变。最后，讨论了金属内衬的材料和尺寸对压力比（COPV 金属内衬第一层破坏压力与临界屈曲压力之比）的影响。当金属衬垫的直径与厚度比 (R/t) 大于 35 时，6063-T5 铝合金衬垫和 S30408 不锈钢衬垫的压力比均超过 2.25。然而，R/t ≤ 60 的 6061-T6 铝合金衬垫的压力比低于 1.85，这表明屈服强度更高、弹性模量更低的金属衬垫对纤维缠绕层的利用率更高。由于现行设计标准仅通过安全系数和各种型式试验及其评价方法来确保 COPV 的可靠性，因此提出的理论计算方法可减少 COPV 在设计和试验过程中的不确定性。

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引用次数: 0