纤维缠绕复合材料约束球形浮力芯材准静态压缩吸能机制

Quasi-static compression energy absorption mechanism of filament wound composite constrained spherical buoyancy core material

针对海洋工程平台的防护吸能和浮力储备需求,设计一种纤维缠绕复合材料约束球形浮力芯材吸能结构。为分析其变形损伤特征和能量耗散机理,通过ABAQUS有限元软件和万能材料试验机开展数值模拟分析和试验验证研究。通过力学响应特征和损伤破坏模式分析可知,结构吸能设计的关键在于表层和芯材的泊松比匹配。芯材主要通过塑性压缩损伤和剪切断裂破坏吸收能量,而表层吸能则主要通过环向的花瓣形拉伸断裂破坏。研究表明,该型结构单元压缩吸能特性优异,可实现海洋工程结构平台的防护吸能和浮力储备要求。

In order to meet the demand of the impact protection and the buoyancy reserve of sea structure platform,a new energy absorption structure of filament wound composite constrained spherical buoyancy core material element was designed.The numerical simulation analysis and experimental test verification were carried out for the structure element by using the ABAQUS finite element software and electronic universal material testing machine in order to investigate the damage modes and energy dissipation mechanism.Further analysis of the mechanical response characteristics and damage modes shows that the key to the structural energy absorption design lies in the matching of the Poisson's ratio of the surface layer and the core material.The core material absorbs energy mainly through plastic compression damage and shear fracture damage,while the surface energy absorption is mainly through circular petal-shaped tensile fracture damage.The results show that this type of structural unit has excellent compression and energy absorption characteristics,and can realize the protection energy absorption and buoyancy reserve requirements of the offshore engineering structure platform.