受内部冲击弯管的破裂失效研究  

Rupture failure of an elbow subjected to internal impact

作　　者：喻健良[1] 秦磊[1] 

机构地区：[1]大连理工大学化工过程机械系,大连116012

出　　处：《振动与冲击》2010年第10期228-231,共4页Journal of Vibration and Shock

摘　　要：受冲击管道的破裂失效研究对压力管道的设计和防护有着重要意义。考虑大变形及应变率对冲击处的影响,基于随动塑性Cowper-Symonds模型,利用ANSYS/LS-DYNA有限元软件结合自主开发的APDL语言建立了内部受半球头弹体横向冲击弯管的模型。分析了受冲击弯管的失效模式及破裂时位移、应变时程曲线,研究了不同厚径比和曲径比下弯管临界破裂动能的变化趋势。结果表明,临界破裂动能随厚径比和曲径比的增加而增加,且厚管破裂时间小于薄管。It is significant for pressure pipeline design and protection to study pipeline rupture failure subjected to impact.An elbow failure model subjected to an inner lateral impact by a hemispherical-nosed missile was established by using ANSYS/DYNA finite element software and the self-developed APDL language,considering the influence of large deformation and strain rate on impact position and the plastic kinematic Cowper-Symonds model.The failure mode of the impacted elbow and the time-histories of its displacement and strain during rupturing were analyzed.The variation curves of its critical rupture kinetic energy with different thickness-diamater rario and curvature-diameter ratio were given.The results indicated that critical rupture kinetic energy raises with increase in thickness-diameter ratio and curvature-diameter ratio,and thick tube rupture time is shorter than thin tube's.

关 键 词：弯管 半球头弹体 临界破裂速度 临界破裂动能 

分 类 号：TB657[一般工业技术—制冷工程]