爆炸与冲击2026，Vol.46Issue(6)：98-112,15.DOI:10.11883/bzycj-2025-0379
基于统一强度理论的弹体侵彻天然气管道局部损伤塑性半径统一解
Unified solution for plastic radius of local damage in gas pipeline under projectile penetration based on the unified strength theory
摘要
Abstract
To reveal the local damage mechanism of natural gas pipelines subjected to high-velocity projectile penetration,a unified solution for the plastic radius of pipeline damage was established based on the unified strength theory,integrating penetration tests,numerical simulations,and theoretical analysis.Through projectile penetration tests on L415M pipeline steel,key parameters including impact feature on the impacted surface of the pipeline,plastic zone and plastic radius were obtained.Based on the experimental results and ANSYS/Workbench,a dynamic model was developed to numerically simulate the distribution of local stress fields and strains in the pipeline.Sensitivity analysis of the intermediate principal stress parameter b was conducted using unified strength theory.Furthermore,in conjunction with a finite cylindrical cavity expansion model,an analytical expression for the plastic radius of pipeline damage was derived,and a failure criterion for local damage of natural gas pipelines under projectile penetration was proposed.According to the criterion,when the plastic radius measured under penetration loading exceeds the critical value rmax defined by the uniaxial tensile fracture strain εf of the material and the model parameter A(which incorporates the intermediate principal stress parameter b),local damage failure of the pipeline can be determined.The results indicate that the theoretical predictions are in best agreement with experimental data whenb=0.2,with a relative error of less than 10％.This approach accurately describes the local plastic deformation and damage behavior of the pipeline,providing a theoretical basis and engineering reference for the safety assessment and protection design of long-distance natural gas pipelines under high-velocity impact loading.关键词
统一强度理论/有限柱形空腔膨胀理论/侵彻荷载/天然气管道/损伤统一解Key words
unified strength theory/finite cylindrical cavity expansion theory/penetration load/natural gas pipeline/unified damage solution分类
数理科学引用本文复制引用
崔莹,申瑞,赵均海,屈展..基于统一强度理论的弹体侵彻天然气管道局部损伤塑性半径统一解[J].爆炸与冲击,2026,46(6):98-112,15.基金项目
陕西省自然科学基础研究计划(2023-JC-YB-296) （2023-JC-YB-296）
陕西省教育厅重点科学研究计划(22JT035) （22JT035）
四川省重点实验室开放基金(24kfck02) （24kfck02）
