Abstract
Epoxy resin, modified with different particle sizes (50 nm, 100 nm, 200 nm) and contents (1 wt %, 3 wt %, 5 wt %, 7 wt %) was manufactured. The mechanical behaviors of tensile, quasistatic fracture and dynamic fracture under SHPB (split Hopkinson pressure bar) loading were investigated. The dynamic fracture behaviors of the composites were evaluated by 2D-DIC (digital image correlation) and the strain gauge technique, and the fracture surface was examined by SEM (scanning electron microscope). According to the results, the tensile modulus and strength significantly increased for epoxy resin modified with 5 wt % Al2O3 of 50 nm. The quasistatic fracture toughness of modified epoxy resin increased with the particle content. However, the fracture toughness of epoxy resin modified with high content fillers decreased for particle agglomeration that existed in epoxy resin. The crack propagation velocity can be decreased for epoxy resin modified with particles under dynamic loading. The dynamic initiation fracture toughness of modified epoxy resin increases with both particle size and content, but when the fillers have a high content, the particle size effects are weak. For the composite under dynamic loading conditions, the toughening mechanism is also affected by particle size.
Highlights
Particulate-filled epoxy resin composites have been widely used in the engineering field due to their excellent mechanical properties and strong designability, which are useful for different applications
Nakamura et al [6,7,8] studied the impact properties of epoxy resin reinforced by silica particles that differ in shape and range in size from 2 to 47 μm
Wetzel et al [15] studied epoxy resin containing varying amounts of nano-TiO2 and nano-Al2 O3, where the quasistatic fracture toughness and flexural strength were improved with increasing nanoparticle contents, and where the fracture toughness was higher for composites modified with small-sized particles
Summary
Particulate-filled epoxy resin composites have been widely used in the engineering field due to their excellent mechanical properties and strong designability, which are useful for different applications. Wetzel et al [15] studied epoxy resin containing varying amounts of nano-TiO2 and nano-Al2 O3 , where the quasistatic fracture toughness and flexural strength were improved with increasing nanoparticle contents, and where the fracture toughness was higher for composites modified with small-sized particles. Particles of 50 nm, 100 nm, and 200 nm will be a better choice for evaluating the particle size effect on the fracture behavior, as well as the particle size effect on the toughening mechanisms of the composite under dynamic loading conditions, both of which need to be studied further. Guo et al [17,18,19] proposed a modified domain-independent interaction energy integral, where the interface or boundary effects were taken into account during the simulation processing Their methods can be effectively applied to crack propagation problems of the particulate-filled epoxy resin composites with complex interfaces. The fracture morphology was examined by SEM (scanning electron microscope), and the toughening mechanism has been given
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