汇报时间：2023年8月29日（周二）上午10:00

汇报地点：创新港校区二号巨构2-6075

汇报人：刘慧

国际会议信息：

会议名称：The 23rd International Conference on Composites Materials ICCM23

会议时间：30st July 2023 to 4th August 2023

会议地点：ICC Belfast

会议简介：The 23rd International Conference on Composites Materials (ICCM 23) is the premier international conference in the field of composite materials and was first held in 1975 in the cities of Geneva and Boston. Since that time the conference has been held biennially in North American, European, Asian, Oceanic and African cities. The event will attract the leading researchers and practitioners, to report and exchange ideas on the latest developments in the advancement and exploitation of a wide range of composites materials and structures.

参会论文信息：

Tittle: Strain rate effect and microscopic behaviour analysis of short segment carbon fibre reinforced composites

Author: Hui. Liu¹, Haibao. Liu², Jin. Zhou^1,*, Qiang. Hou¹, Yugang. Duan¹

Abstract：In the present paper, strain rate sensitivity has been studied for the 3D-printed short-cut carbon fiber reinforced polylactic acid composite (CF/PLA). Composite specimens have been fabricated through Fused Deposition Modeling (FDM) additive manufacturing (AM) technology and were tested subjected different tensile loading rates. Additionally, a morphological analysis was conducted using scanning electron microscopy (SEM) on the fracture surface of the tested specimens. Initial attention focused on assessing the basic mechanical property of the CF/PLA, that is to study the basic mechanical properties of composite materials, it has been shown that the CF/PLA composites exhibit a rate-sensitivity, with the tensile strength increased slightly from quasi-static to dynamic loading rates. In addition, the SEM observations of the tensile tested pieces at different rates have been obtained. It has been found that the tensile section corresponding to the low loading rate is flat, and the damage exist in the matrix. The exposed fibers were mostly in transverse direction. With the increased tensile loading rate, the section tends to become uneven, and the number of exposed fibers has increased, which are now mainly along the longitudinal direction. This indicates that, under high tensile loading rate, the stress in the fibre is highly concentrated and leads to the initial cracking, which then propagates through the matrix. These eventually form an uneven fracture surface consisting of fibre and matrix damage. It has been clearly shown that the studied short-cut fibre reinforced composite materials present strain rate dependency, by showing different mechanical properties and fracture behaviours subjected to different tensile loading rates.

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