Hongxia Liu , Xiaoxiao Wang , Fang Liu , Wei Cui , Jie Yang , Haofeng Chen
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引用次数: 0
摘要
本研究基于Gurson-Tvergaard-Needleman（GTN）损伤模型，重点研究了均质板中非共线平行椭圆双裂纹的凝聚模式，考察了不同水平距离和垂直距离下椭圆双裂纹的凝聚模式。以水平距离 s 与裂纹长度 a 的比值为横轴，以垂直距离 h 与裂纹长度 a 的比值为纵轴绘制曲线图，然后对凝聚模式进行总结，并与线性双裂纹的凝聚模式进行比较。结果发现，非共线平行椭圆双裂纹表现出三种凝聚模式：裂纹尖端到裂纹尖端凝聚、裂纹间隔到裂纹间隔凝聚和裂纹尖端到裂纹间隔凝聚。每种凝聚模式都有自己的特点。以 s/a 和 h/a 为坐标，三种凝聚模式有规律地分布在图中的三个区域。当双裂缝之间的水平距离 s 和垂直距离 h 分别相等时，椭圆形双裂缝和线形双裂缝的裂缝扩展过程和凝聚模式存在显著差异。
A study on three coalescence modes of non-collinear parallel elliptical double cracks
Based on the Gurson-Tvergaard-Needleman (GTN) damage model, this study focused on the coalescence modes of non-collinear parallel elliptical double cracks in a homogeneous plate, and the coalescence modes of elliptical double cracks under different horizontal distances and vertical distances were investigated. The ratio of horizontal distance s to crack length a was taken as the horizontal axis, the ratio of vertical distance h to crack length a was taken as the vertical axis to plot the graph, then the coalescence modes were summarized and compared with the coalescence modes of linear double cracks. It was found that the non-collinear parallel elliptical double cracks exhibited three coalescence modes: crack tip to crack tip coalescing, crack interval to crack interval coalescing, and crack tip to crack interval coalescing. Each coalescence mode had its own characteristics. The three coalescence modes were distributed regularly in three regions in the graph with s/a and h/a as coordinates. When the horizontal distance s and the vertical distance h between the double cracks were equal respectively, there were significant differences in the crack propagation process and coalescence modes between elliptical double cracks and linear double cracks.
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.
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