摘要
泡沫混凝土是一种经济环保的轻质土工材料。为改善泡沫混凝土的抗冲击性能,拓展其工程应用场景,文章提出以聚乳酸塑料蜂窝骨架为增强相的泡沫混凝土填充结构。在落锤低速冲击试验的基础上,开展该轻质组合结构抗冲击性能的数值模拟研究,研究不同密度的填充泡沫混凝土、蜂窝骨架的细观拓扑构型以及冲击能量对泡沫混凝土填充蜂窝结构冲击失效模式和抗冲击性能的影响。结果表明:在低速冲击下,蜂窝与泡沫混凝土的协同作用增强了结构的冲击韧性,与未填充蜂窝相比,填充结构的局部压溃强度提升94.5%。此外,锤头的侵彻深度与蜂窝骨架的相对密度以及泡沫混凝土的密度呈负相关,而增大蜂窝胞元的不规则度、特征长度或降低骨架相对密度、泡沫混凝土密度能够不同程度地降低冲击峰值力,延长冲击压溃过程。
Foam concrete is an economical and environmentally friendly lightweight geotechnical material.To enhance the impact resistance of foam concrete and broaden its engineering applications,the study proposes a foam concrete-filled structure reinforced with a honeycomb skeleton.Numerical simulations were conducted to study the impact resistance of this lightweight composite structure,based on low-velocity impact tests using a drop hammer.The effects of different foam concrete densities,mesoscale topological configurations of the honeycomb skeleton,and varying impact energies on the failure modes and impact resistance of the foam concrete-filled honeycomb structure were analyzed.The results show that the synergistic effect of honeycomb and foam concrete significantly improves the structure's impact ductility under low-velocity impact,resulting in a 94.5%increase in local crushing strength compared to an unfilled honeycomb.Additionally,the penetration depth of the hammer is found to be inversely correlated with the relative density of the honeycomb skeleton and the foam concrete density.Increasing cellular irregularity and characteristic length of the honeycomb skeleton or decreasing the relative density of the skeleton and the foam concrete density could differently reduce the peak impact force and extend the duration of the impact event.
作者
袁泉
王士龙
刘洋
YUAN Quan;WANG Shilong;LIU Yang(School of Civil Engineering and Architecture,Anhui University of Technology,Maanshan 243032,China)
出处
《塑料科技》
北大核心
2025年第7期93-99,共7页
Plastics Science and Technology
基金
安徽省高校自然科学研究项目(2023AH051083)。
关键词
泡沫混凝土
聚乳酸蜂窝
有限元模拟
低速冲击
冲击韧性
Foamed concrete
Polylactic acid honeycomb
Finite element simulation
Low-velocity impact
Impact ductility
