The influence of different compositions of fiber metal laminates on the fracture in the semi-solidified stamping forming

Abstract

Fiber metal laminates (FMLs) are widely used in manufacturing due to the high specific strength, fatigue resistance, and lightweight. However, because of the deformation coordination of different layers of FMLs, challenges have been faced in rapid and small part forming. To research the feasibility of the fast forming of small parts using the FMLs, the influence of different compositions of FMLs on the stamping performance under the semi-solidified process condition was investigated, including the outer aluminum layer, the fiber lay-up direction in the middle layer, and the various states of the resin. Based on the results of Finite-element simulation and experiments, the semi-solidified process can improve the forming performance of FMLs by making the thickness distribution of the outer aluminum layers more uniform and preventing excessive fiber deformation. The coordination of fiber lay-up direction and interlayer forces can improve the forming limit height of semi-solidified FMLs. Besides, the fracture position of the cup part is related to the fiber lay-up direction and interfacial bonding performance in FMLs. This study provides necessary guidance for the rapid stamp forming of small parts using FMLs.

Investigation into a comprehensive forming limit curve considering multi-parameters effects for semi-cured FMLs through uniform pressure loading test

“…It is worth mentioning that s i ðhÞ should be zero when h ¼ p 2 , because there is no relative movement of tendency of any layer at the polar point. Several studies have demonstrated the accuracy of Coulomb model both in cured and semi-cured numerical simulations (Blala et al, 2019;Li et al, 2020aLi et al, , 2020b. With the help of shear stress distribution law of general adhesion structure, it may be assumed that the distribution of s i ðhÞ along h presents the characteristics of cosine function, and this assumption can effectively decrease the difficulty of solving equation ( 12).…”

“…The metal layers were manufactured using multilayer sheet hydroforming to improve the efficiency, while the prepreg was laid in the middle of FMLs curing of the part. To our best knowledge, the semi-cured FMLs has better formability than the cured one since the semi-cured resin allows large slip at the interface (Li et al, 2020a;Sherkatghanad et al, 2018).…”

“…In addition, the results showed that different failure models were detected along with different directions, in which tensile fracture appeared in the 0 layers and matrix fracture occurred in the 90 layers. Blala et al, (2019Blala et al, ( , 2021 and Li et al, (2020a) studied the cold/hot stamping parameters of GLARE, which have a significant influence on stamping depth and quality. The results indicated that better parts could be acquired by optimizing blank holder force (BHF) and blank holder gap (BHG).…”

Short beam shear damage analysis of GLARE laminates based on digital image correlation and finite element analysis

“…As a successful type of Fiber Metal Laminates (FMLs), GLARE (Glass fiber reinforced aluminum laminates) combines the advantages of both metal and composites (Mrzljak et al., 2020). GLARE laminates have been applied in some structural parts of civil aircrafts such as the fuselage skin of Airbus A380 (Guan et al., 2009) and the bulk cargo floor of Boeing B777 (Chai and Manikandan, 2014) due to good impact damage resistance, fatigue properties (Bhat and Patibandla, 2013), corrosion resistance (Wang, 2020), and anti-fire performance (Li et al., 2020). GLARE is fabricated by hot-pressing of alternate multi-layers of aluminum alloy sheet and unidirectional glass fiber/epoxy resin prepreg, the bonding strength of the interface determines interfacial stress transfer degree (Gonzalez-Canche et al., 2018) and has an obvious influence on the interlaminar as well as the comprehensive properties (Hu et al., 2020; Ji et al., 2020).…”