Strain Rate Effects on Tensile and Compressive Behaviour of Woven-Knitting Glass/Epoxy Composites

Abstract

The main purpose of this study was to investigate the tensile and compressive behaviour of woven-knitting glass/epoxy composites under low strain rate by using UTEST testing machine with capacity of 50kN. The strain rate values were selected as 0.005, 0.0005 and 0.00005s-1. The effect of knitting direction as wale, course and 45° and knitting structure as rib and milano on the tensile and compressive behaviour of woven-knitting glass/epoxy composites under low strain rate was also discussed. The woven-knitting composite samples were tested under uni-axial tensile and compressive loading. The woven-knitting composites have eight layer with woven fabric (W), rib (R) and milano (M) knitting fabrics as (W 2 /R 2)S and (W 2 /M 2)S. The woven-knitting composites were manufactured by hand lay-up method. The fibre volume fraction and thickness of manufactured woven-knitting composites were measured 65% in weight and 2.9mm, respectively. The experimental results showed that the tensile and compressive properties of woven-knitting glass/epoxy composites decrease from 0.005 s-1 to 0.00005s-1. The tensile properties in all directions of plate with rib knitting were obtained higher than the plate with milano knitting. However, the highest compressive properties were obtained from plate with rib knitting in course direction.

Fiber Takviyeli Kompozitlerin Farklı Deformasyon Hızındaki Mod I ve Mod I/II Kırılma Davranışların İncelenmesi

“…M. Kopietz ve arkadaşları [5] organo-mineral hibrit reçinelerinin eğilme ve kırılma dayanımları üzerine yaptıkları çalışmalarda tek kenar çatlaklı numunelerini farklı deformasyon hızlarında deneye tabi tutmuşlardır. Aktaş ve arkadaşları [6] cam/epoksi tabakalı kompozit plakaların örgü tipinin farklı oranlarındaki mekanik davranış özelliklerinin araştırmışlardır. Çalışmalarında 0,005 s -1 , 0,0005 s -1 ve 0,00005 s -1 deformasyon hızlarını kullanmışlardır.…”

The effects of temperature and deformation rate on fracture behavior of S‐2 glass/epoxy laminated composites

“…Kopietz et al [8] have tested specimens with single edge crack at different strain rates to investigate the flexural and fracture strength of organo-mineral hybrid resins. Aktaş et al [9] investigated the mechanical behavior of glass/epoxy laminated composite reinforced with different knitted fabric types under deformation rates of 0.005, 0.0005, and 0.00005 second −1 . Cui et al [10] investigated the mechanical and damage behavior of long fiber polymer composites at low deformation rates (0.001 and 0.01 second −1 ) and high deformation rates (1,10,100,200, and 400 seconds −1 ).…”