论文部分内容阅读
目的:压力管道是海洋石油化工等领域的常用构件,但经常受到泄漏、爆炸和冲击等事件的威胁。本文旨在探讨压力管道在高速冲击作用下的力学响应及失效机理。创新点:1.开发考虑金属大变形和高应变率的非线性模型,通过基于表面的流体腔模型来模拟管道气体和管道的耦合作用,简化计算模型,提高计算效率;2.通过非线性有限元模型,对管道高速冲击响应的影响因素进行研究分析。方法:1.采用Johnson-Cook模型模拟金属的大应变及大应变率;2.采用基于表面的流体腔模拟管道与内部气体的耦合作用;3.与实验结果对比验证模型的准确性;4.分析影响管道抗冲击性能的参数。结论:1.管道壁厚显著影响管道的抗冲击性能;2.在相同冲量下,冲击头与管道的接触面积越小,管道越容易被穿透;3.在管道受到冲击时,管道内压越大,管道抗穿透能力越小;4.在管道未被破坏时,管道内压能够增加管道的弹性,减小管道受冲击后的凹陷深度。
PURPOSE: Pressure pipelines are a common component in areas such as offshore petrochemicals but are often at risk of leaks, explosions and shocks. The purpose of this paper is to investigate the mechanical response and failure mechanism of pressure pipes under high-speed impact. Innovative points: 1. Develop a nonlinear model considering large deformation and high strain rate of metal, simulate the coupling between pipeline gas and pipeline through the surface-based fluid cavity model, simplify the calculation model and improve the computational efficiency; 2. By nonlinear finite Metamodel, the impact of high-speed pipeline impact factors for research and analysis. Methods: 1. Using the Johnson-Cook model to simulate the large strain and large strain rate of metal; 2. Using the surface-based fluid cavity to simulate the coupling between the pipeline and the internal gas; 3. Contrasting with the experimental results to verify the accuracy of the model; Analyze the parameters that affect the impact resistance of the pipe. 2. The pipe wall thickness significantly affects the impact resistance of the pipe; 2. The smaller the contact area of the impact head with the pipe under the same impulse, the more easily the pipe is penetrated; 3. When the pipe is impacted, the pipe internal pressure The greater the resistance to penetration of the pipeline is smaller; 4. The internal pressure of the pipeline can increase the flexibility of the pipeline when the pipeline is not damaged, and reduce the depth of the depression after the pipeline is impacted.