Influence of Braiding Angle on Multiple Impact Damages of 3-D Braided Composite along Longitudinal Direction
- PDF / 6,271,299 Bytes
- 20 Pages / 439.37 x 666.142 pts Page_size
- 21 Downloads / 171 Views
Influence of Braiding Angle on Multiple Impact Damages of 3-D Braided Composite along Longitudinal Direction Xingzhong Gao 1 & Amna Siddique 1 & Baozhong Sun 1 & Bohong Gu 1 Received: 9 April 2019 / Accepted: 5 June 2019/ # Springer Nature B.V. 2019
Abstract This paper reports deformation and damage evolutions of three-dimensional (3-D) braided composite with different braiding angles under multiple impact compression along longitudinal direction. Braided composites with braiding angle of 15°, 26° and 37° have been prepared for the compression tests. The impact compression test was conducted on a split Hopkison pressure bar (SHPB) along longitudinal direction. A high-speed camera was used to record damage development. A meso-scale finite element model has been established to simulate damage processes. The results show that the damage of composites occurs mainly in the first three impacts. For the 15° sample, damage of yarns and interface dominates the failure mechanisms at the first impact. For the 26° and 37° samples, the resin fracture and interface de-bonding lead to compressive failure at the first impact. Breakage and dislocation of yarns occurred for 15° sample during the subsequent two impacts, whereas it still keeps good structural integrity for 26° and 37° samples. The angle between adjacent yarns increased for the 26° sample and the yarns just tightened each other for 37° sample. Ductile damage is the primary damage mode for both yarns and resin during the multiple impacts. Keywords 3-D braidedcomposite . Multiple impact compression . Finite elementanalysis (FEA) . Split Hopkinson pressure bar (SHPB) . High-speed camera
1 Introduction Textile preform based composite materials have been widely applied to electromagnetic [1–3], thermoelectric [4] and mechanical [5, 6] areas. As a specific textile composite, threedimensional (3-D) braided composite has also been widely used for aerospace, automotive and structure engineering due to its high impact resistance, damage tolerance and high strengthweight ratio [7–9]. It is inevitable for composites to undertake high impact compression load in * Bohong Gu [email protected]
1
College of Textiles, Donghua University, Shanghai 201620, China
Applied Composite Materials
service. Dynamic loading response of composite is quite different from statistic load [10–12]. Dynamic response of braided composite has gained considerable research interest in recent years. Mechanical property in longitudinal and transverse direction weakened with increasing braiding angle [13], but strengthen in the through-thickness direction [14]. Yarns breakage, resin crack, yarns buckling and interface debonding are the main failure modes during impact processes [15–17]. Zhou [18] found the cracks nucleate in the weak areas and propagate along the path of least resistance between yarns for low impact velocity. For high impact velocities, cracks develop along a relatively straight path with fiber breakage under high shear and tensile stress. The similar result was also found by Zhang [19] in
Data Loading...
