Zhangabay Nurlan, Ibraimova Ulzhan, Ainabekov Alpysbay, Buganova Svetlana, Moldagaliev Arman
Department of Architecture and Urban Planning, M. Auezov South Kazakhstan University, Av. Tauke Khan, No. 5, Shymkent 160012, Kazakhstan.
Department of Industrial Civil and Road Construction, M. Auezov South Kazakhstan University, Av. Tauke Khan, No. 5, Shymkent 160012, Kazakhstan.
Materials (Basel). 2024 Apr 24;17(9):1963. doi: 10.3390/ma17091963.
The dynamic stress-strain state and fracture of a steel main gas pipe section between supports with a straight-through crack was analyzed with consideration of the temperature effect on changes in the mechanical properties of the pipe material. The numerical solution of the problem was implemented in the ANSYS-19.2/Explicit Dynamics software package. The process of fracture in a section of the gas pipeline "Beineu-Bozoy-Shymkent" with a linear crack in the temperature range of -40 °C to +50 °C at the operating pressure of 7.5 MPa and critical pressure equal to 9.8 MPa was considered. As a result, it was found that at the initial growth of the internal pressure from working pressure to critical pressure, the length of the crack doubled. At the same time, the process had a local characteristic. Further development of the crack had the nature of avalanche fracture and depended on the temperature of the steel pipeline. With increasing temperature, there was also an increase in the length of the crack at the avalanche fracture. Thus, at a temperature of 40 °C, the crack lengthened 67.75-fold; at a temperature of -10 °C, the crack lengthened 68-fold; at a temperature of +20 °C, the crack lengthened 68.25-fold; and at a temperature of +50 °C, the crack lengthened 68.5-fold. In this work, this difference was 75% of the initial crack length. This fact will be used for further development of the technique of strengthening damaged pipe sections using bandages.
考虑到温度对管材力学性能变化的影响，分析了带有直通裂纹的支撑间钢质主燃气管道段的动态应力应变状态及断裂情况。该问题的数值解在ANSYS - 19.2/显式动力学软件包中实现。研究了在“别伊涅乌 - 博佐伊 - 希姆肯特”燃气管道一段中，线性裂纹在-40℃至+50℃温度范围内、工作压力为7.5MPa且临界压力等于9.8MPa时的断裂过程。结果发现，在内压从工作压力增长到临界压力的初始阶段，裂纹长度翻倍。同时，该过程具有局部特征。裂纹的进一步发展具有雪崩式断裂的性质，且取决于钢质管道的温度。随着温度升高，雪崩式断裂时裂纹的长度也增加。因此，在40℃时，裂纹长度增长了67.75倍；在-10℃时，裂纹长度增长了68倍；在+20℃时，裂纹长度增长了68.25倍；在+50℃时，裂纹长度增长了68.5倍。在这项工作中，这种差异为初始裂纹长度的75%。这一事实将用于进一步开发使用绷带加固受损管道段的技术。
