Experimental studies on the punch shear characterization of glass/epoxy/CNTs laminate nanocomposites

Abstract

The effects of specimen diameter to punch diameter (span ratio) and loading velocity are experimentally studied on quasi‐static punch shear (QS‐PS) properties of laminate nanocomposites. Nanocomposites specimen in this work is composed of 12 layers of plain weave glass fibers with areal density of 200 g/m2 which are made by hand lay‐up method under pressure. Resin is composed of a two‐component epoxy; diglycidyl ether of bisphenol A (Epon 828) as the base and modified cycloaliphatic amine (Epikure F‐205) as the curing agent. Multi‐walled carbon nanotubes (MWCNTs) modified by hydroxide (COOH) are used with 0%, 0.1%, 0.5%, and 1% ratio in weight with respect to the matrix. Also, two span ratios (5 and 10) and two loading velocities (5 mm/min and 500 mm/min) are utilized. Test results show that with a half span ratio in neat samples, the total penetration energy is approximately constant but the contact force increases about 20%, displacement at peak load decreases about 57%, and target plate deformation is reduced until full penetration. With increase of loading velocity from 5 to 500 mm/min, total absorbed energy of neat samples is increased about 47%. The results show that carbon nanotubes reduce the strength of the composites in which their failure mechanism is shear type. POLYM. COMPOS., 39:E2096–E2105, 2018. © 2017 Society of Plastics Engineers

Tetraglycidyl ether 1.1.2.2‐tetraphenyl ethane epoxy resin modified by carbon nanotubes

“…At present, most research focuses on epoxy resin based on bisphenol A. [25,26] The modification of multifunctional high-performance epoxy resin needs to be further studied, especially the high-performance epoxy resin used in special fields.…”

Effects of nanomaterials on the mechanical properties of epoxy hybrid composites

“…Modesti et al [9] focused on the influence of processing conditions on nanocomposite structures, i.e., intercalated or exfoliated and on the enhancement of mechanical properties of polypropylene nanocomposites. Sadeghi et al [10] work related to the effects of specimen diameter to punch diameter (span ratio) and loading velocity are experimentally studied on quasi-static punch shear (QS-PS) properties of laminate nanocomposites. Kumar et al [11] studied the various combinations of nanomaterials and matrix materials that were used to fabricate the nanocomposite laminates with and without.…”