组合双轴载荷下高温螺栓的应力松弛评估：理论与模拟

IF 3 2区工程技术 Q2 ENGINEERING, MECHANICAL

International Journal of Pressure Vessels and Piping Pub Date : 2024-08-30 DOI:10.1016/j.ijpvp.2024.105302

Cheng Gong , Jian Xiao , Xiuqing Lu , Peishan Ding , Xiaotao Zheng

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引用次数: 0

摘要

估算高温螺栓连接系统中的螺栓应力对于确定螺栓预紧力和评估螺栓装配完整性至关重要。考虑到螺栓应力分布和松弛的特点，本研究提出了一种理论模型，用于估算螺栓在拉伸、弯曲、扭矩和剪切组合载荷下的高温载荷。为了评估该模型的准确性，采用了有限元分析来研究各种蠕变参数和载荷组合对螺栓应力松弛的影响。结果表明，引入弯矩、扭矩和剪切载荷会加速螺栓的轴向应力松弛。在持续 30 万小时的高温载荷下，理论模型预测的应力松弛与有限元分析的结果非常吻合。

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Stress relaxation assessment of high-temperature bolts under combined biaxial loads: Theory and simulation

Estimating bolt stress within high-temperature bolted connection systems is crucial for determining bolt preload and assessing bolt assembly integrity. This work proposes a theoretical model for estimating high-temperature bolt load under combined tension, bending, torque, and shear loads, considering the characteristics of bolt stress distribution and relaxation. To assess the model's accuracy, finite element analysis was employed to examine the impact of various creep parameters and load combinations on bolt stress relaxation. The results indicate that the introduction of bending moments, torque, and shear loads accelerates axial stress relaxation in bolts. Under a high-temperature load for 300,000 h, the stress relaxation predicted by the theoretical model aligns well with the results from finite element analysis.

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来源期刊

International Journal of Pressure Vessels and Piping 工程技术-工程：机械

CiteScore

5.30

自引率

13.30%

发文量

208

审稿时长

17 months

期刊介绍： Pressure vessel engineering technology is of importance in many branches of industry. This journal publishes the latest research results and related information on all its associated aspects, with particular emphasis on the structural integrity assessment, maintenance and life extension of pressurised process engineering plants. The anticipated coverage of the International Journal of Pressure Vessels and Piping ranges from simple mass-produced pressure vessels to large custom-built vessels and tanks. Pressure vessels technology is a developing field, and contributions on the following topics will therefore be welcome: • Pressure vessel engineering • Structural integrity assessment • Design methods • Codes and standards • Fabrication and welding • Materials properties requirements • Inspection and quality management • Maintenance and life extension • Ageing and environmental effects • Life management Of particular importance are papers covering aspects of significant practical application which could lead to major improvements in economy, reliability and useful life. While most accepted papers represent the results of original applied research, critical reviews of topical interest by world-leading experts will also appear from time to time. International Journal of Pressure Vessels and Piping is indispensable reading for engineering professionals involved in the energy, petrochemicals, process plant, transport, aerospace and related industries; for manufacturers of pressure vessels and ancillary equipment; and for academics pursuing research in these areas.