Mode I fracture toughness of fiber-reinforced polymer composites: A review

Abstract

Composite materials are known for their high stiffness and strength at lower weight as compared to conventional structural materials. Recently, there has been a growing interest in finding the new ways to decrease delamination failure, which is a life limiting factor of laminated composites. This review paper emphasizes on the effects of different reinforcement structures on mode I fracture toughness and possible ways to improve fracture toughness. A brief description on intrinsic and extrinsic mechanisms of crack growth has been discussed along with the earlier investigations and recent developments for mode I fracture toughness testing. Factors that affect the fracture toughness are also discussed. A brief knowledge of mode I fracture toughness of traditional and advanced fiber-reinforced composites is given, which could help researchers to understand fracture behaviors of composites and thus, it can help engineers to design composites with higher interlaminar strength.

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

“…Also, for the Mode I/II crack tip opening condition, the crack was positioned at a 45° angle with the weft direction (Figure 2B). [ 2,7,13–15,17 ]…”

“…Also, for the Mode I/II crack tip opening condition, the crack was positioned at a 45 angle with the weft direction ( Figure 2B). [2,7,[13][14][15]17] 2.2 | Determination of fracture toughness Cold and hot environments were created in the thermostatic chamber of the 100-kN Shimadzu AG-X model universal test device. Nitrogen gas was used for a cold environment and a resistance heating unit was used for the hot environment ( Figure 3A).…”

“…For this aim, some fracture tests achieved on composite specimens with a single edge crack. Siddique et al [ 15 ] presented a comprehensive summary of studies on fiber and matrix fracture, knitting shape, manufacturing process, specimen thickness, strain rate and temperature in a study for Mode I fracture toughness in fiber‐reinforced composites.…”

Investigation of Mode I and Mode I/II Fracture Behavior at Different Deformation Rates of Fiber Reinforced Composites

“…Tek kenardan çatlağa sahip kompozit numunelerinin çekme testini gerçekleştirmişlerdir. Siddique ve arkadaşları [14] fiber takviyeli kompozitlerde Mod I kırılma tokluğu üzerine yaptıkları derleme çalışmada fiber ve matris kırılması, örgü şekli, üretim yöntemleri, numune kalınlığı, çekme hızı ve sıcaklık açısından yapılan çalışmaların bir özetini sunmuşlardır. Kırılma yapı elemanlarında ani gelişen bir hasar türüdür.…”

Influence of Particle Size on Toughening Mechanisms of Layered Silicates in CFRP

“…This is because of a higher restriction of toughening effects and plastic deformation with higher fiber content. Other factors that influence the interlaminar-fracture toughness in fiber-reinforced composites are the resin system, processing method and conditions or specimen geometry [39].…”