An experimental study on mechanical characteristics of fly ash cenosphere / polyurethane syntactic foam under quasi-static and dynamic compression
WANG Zhuangzhuang1,XU Peng1,FAN Zhiqiang1,ZHANG Bingbing2,WANG Yonghuan1
1.School of Science, North University of China, Taiyuan 030051, China;
2.School of Environmental and Safety Engineering, North University of China, Taiyuan 030051, China
Abstract:A novel syntactic foam with multi-scale closed-cell system was prepared by incorporating large size fly ash cenosphere into rigid polyurethane foam.Mechanical properties and deformation mechanisms of syntactic foam were identified under both quasi-static and dynamic compression tests.Results show that, ① The compressive response of syntactic foam was characterized by three typical processes, that is, elastic stage, stress plateau stage and densification stage.The syntactic foam exhibited a flat plateau stress stage, facilitating its application in protective engineering.With the density varying from 0.45—0.6 g/cm3, the plateau stress (6.5—18 MPa) and the energy absorption performance (3.42—8.9 MJ/m3) increased with the density.It also implied that the variation trend of strength and plateau stress followed the power function relationship with the relative density.② By using aluminum honeycomb as the reinforcement, the quasi-static compressive strength and plateau stress increased about 20%—45% and 10%—25% respectively.Moreover, the main failure mode of syntactic foam transformed from shear cracking to axial compression in reinforced material under quasi-static loading.③ With the strain rate range from 0.001—1 500 s-1, the compressive strength showed obvious strain rate sensitivity while the plateau stress changed marginally with the strain rate.However, for reinforced material, the compressive strength and plateau stress both exhibited significant strain rate dependence.In summary, use of aluminum honeycomb as reinforcement not only enhanced mechanical properties of syntactic foam but also improved its dynamic behavior.This investigation provides a new approach to facilitate the potential application of industrial waste in safety engineering.
王壮壮1,徐鹏1,范志强1,张冰冰2,王永欢1. 粉煤灰聚氨酯复合泡沫静动态力学特性实验研究[J]. 振动与冲击, 2020, 39(4): 229-235.
WANG Zhuangzhuang1,XU Peng1,FAN Zhiqiang1,ZHANG Bingbing2,WANG Yonghuan1. An experimental study on mechanical characteristics of fly ash cenosphere / polyurethane syntactic foam under quasi-static and dynamic compression. JOURNAL OF VIBRATION AND SHOCK, 2020, 39(4): 229-235.
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