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

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引用次数: 0

摘要

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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Determination of the Gurson-Tvergaard-Needleman damage model parameters for simulating small punch tests of heat-resistant alloys

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.

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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.