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| 磁铁矿混凝土动态力学性能试验研究与数值模拟 |
| Experimental study and numerical simulation of dynamic mechanicsof magnetite concrete |
| 投稿时间：2024-05-06 修订日期：2024-05-14 |
| DOI： |
| 中文关键词: 磁铁矿混凝土 SHPB 动力特性 PFC |
| 英文关键词:Magnetite concrete SHPB Dynamic PFC |
| 基金项目:国家自然科学基金(51678286)。 |
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| 中文摘要: |
| 磁铁矿混凝土作为新型防辐射混凝土已被广泛用于医疗基础设施、人防工程、核反应堆、核废物处置库以及重大的国防工程等特殊工程领域。从空间受力维度分析,特殊工程结构大都处于复杂应力状态,当建筑遭受军事打击或地震引起的爆炸冲击荷载时,在动态荷载作用下导致磁铁矿混凝土构件的动态损伤规律十分复杂。本文以磁铁矿混凝土为研究对象,采用分离式霍普金森压杆装置(SHPB)对磁铁矿混凝土试块进行动态冲击试验研究,研究应变率对磁铁矿混凝土动态力学性能的影响,并采用颗粒流程序PFC2D进行数值模拟,从细观层面进一步分析其破损机理。 |
| 英文摘要: |
| As a new type of radiation-resistant concrete, magnetite concrete has been widely used in special engineering fields such as medical infrastructures, human defence projects, nuclear reactors, nuclear waste repositories and major national defence projects. Analysed from the spatial stress dimension, most of the special engineering structures are in a complex stress state, and when the buildings are subjected to military strikes or earthquake-induced explosive impact loads, the dynamic loads lead to a complex dynamic damage law of magnetite concrete members. In this paper, taking magnetite concrete as the research object, the Separated Hopkinson Pressure Bar Device (SHPB) is used to carry out dynamic impact test research on magnetite concrete specimens to study the effect of strain rate on the dynamic mechanical properties of magnetite concrete, and numerical simulation is carried out using the particle flow program PFC2D to further analyse the breakage mechanism from the fine-scale level. |
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