摘要
海冰在凝结过程中不可避免地会产生裂缝或气泡等初始缺陷,这些缺陷会影响冰的力学性能。为了研究含初始缺陷冰板的裂纹扩展和破碎特性,本文基于近场动力学(Peridynamics,PD)理论,引入键的切向刚度系数,发展了双参数PD方法,建立了冰的双参数PD弹脆性模型。该模型突破了传统键基PD固定泊松比的限制,同时继承了键基PD的简单性和稳定性等优点。通过对薄板的连续变形和冰梁的三点弯曲断裂试验进行模拟,验证了模型的准确性。研究了冰的泊松比、初始裂隙缺陷、气泡缺陷、冰晶粒尺寸、初始缺陷形状以及多孔缺陷对冰力学特性的影响。结果表明,采用冰的双参数PD弹脆性模型来预测冰体从连续到非连续的全破坏过程是可行的,且冰体中的初始缺陷极大影响着冰体结构的起裂时刻和破坏模式。
Initial defects such as cracks or bubbles will inevitably occur during sea ice condensation,which affect the mechanical properties of ice.To study the crack propagation and fracture characteristics of ice plate with initial defects,based on the peridynamic(PD)theory,the tangential stiffness coefficient for bond is introduced,a two-parameter PD method is proposed,and the two-parameter PD elastic-brittle model of ice material is established.The new model overcomes the limitation of fixing Poisson's ratio and inherits simplicity and stability of the traditional bond-based PD method.The model is verified by simulating the continuous deformation of thin plate and the three-point bending test of sea ice.Furthermore,effects of Poisson’s ratio,initial crack defects,bubble defects,ice grain size,defect shapes and multi-bubble defects on the mechanical properties of sea ice are investigated.The results indicate that the two-parameter PD elasticbrittle model is feasible to predict the continuous to discontinuous failure of sea ice,and the initial defects greatly affect the initiation time and failure mode of the ice structure.
作者
李双
吕海宁
黄小华
杨建民
LI Shuang;LÜ Hai-ning;HUANG Xiao-hua;YANG Jian-min(Hainan Research Institute,Shanghai Jiao Tong University,Sanya 572000,China;State Key Laboratory of Ocean Engineering,Shanghai Jiao Tong University,Shanghai 200240,China;Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education,Guangxi University,Nanning 530004,China;School of Naval Architecture and Ocean Engineering,Jiangsu University of Science and Technology,Zhenjiang 212100,China)
出处
《船舶力学》
北大核心
2026年第1期78-88,共11页
Journal of Ship Mechanics
基金
海南省科技计划科技城联合项目(520LH015)
中国博士后科学基金第18批特别资助项目(2025T180076)。
关键词
近场动力学
冰
初始缺陷
裂纹扩展
脆性破坏
peridynamics
ice
initial defect
crack propagation
brittle failure
