Dynamic response of foam concrete under low-velocity impact: experiments and numerical simulation. (December 2020)

• Record Type: Journal Article
• Authors: Guo, Quanquan; Gou, Yongbao; Chen, Jun; Zhang, Yang; Zhou, Yao
• Is Part Of: International journal of impact engineering. Volume 146(2020)
• Publication Date: 2020-12
• Subjects: Foam concrete -- Dynamic response -- Impact test -- SPH method -- Buffer material; Impact -- Periodicals; Shock (Mechanics) -- Periodicals; Impact -- Périodiques; Choc (Mécanique) -- Périodiques; Impact; Shock (Mechanics); Periodicals; 620.1125
• DOI: 10.1016/j.ijimpeng.2020.103693
• Languages: English
• ISSNs: 0734-743X

Abstract

Highlights: The dynamic response of foam concrete was studied by drop hammer impact tests. The scale tests of heavy object impacting the floor with foam concrete buffer layer were carried out. The buffer layer of foam concrete can significantly reduce the maximum impact force. Smooth particle hydrodynamics (SPH) model simulated the test process reasonably well. Critical thickness of the buffer layer was proposed by means of densification strain. Abstract: The dynamic response of foam concrete under low-velocity impact has been studied through impact tests of cubes and buffer layers. The impact response of foam concrete consisted of three stages. Foam concrete showed slight strain rate effect and confining pressure could significantly increase the plateau impact force. The laying of buffer layer obviously reduced the maximum impact force during impact (96% reduction was observed at 4.43 m/s). Smooth particle hydrodynamics (SPH) models based on impact tests of buffer layer were established, which simulated the test process reasonably well. The influence of impact velocity and thickness on maximum impact force was revealed and the critical thickness was obtained by means of the densification strain. Finally, the mechanism of impact damage was investigated and the characteristic of layer-by-layer damage of foam concrete was revealed.