عنوان مقاله [English]
Nowadays, due to the development of automated composite manufacturing processes from prepregs, it is necessary to recognize the main prepregs properties and the factors affecting them. After the precuring stage, the tack is one of the main characteristics of the prepregs, and this parameter is the viscoelastic properties of the prepreg bulk. tack is the ability of prepreg to stick to itself or to other surfaces. Factors affecting premature tack can be divided into two general categories of structural factors and process factors. the most important structural factors is the type of resin, resin formulation, molecular weight, viscosity, degree of cure, fabric type, fabric architecture, temperature, volume of cavities and volatile content are mentioned. Also, the most important process factors are humidity content, aging, contact time, contact force, separation force, lay-up speed and angle. The cohesive failure and interfacial failure of two mechanisms of failure have been proven in tack of prepreg and these two mechanisms are capable of becoming each other under different conditions. Also, due to the lack of a standard test, several different methods, such as floating roller, probe, rolling ball, peel, Lap shear and Loop tack test, are used to measure the amount of tack. In this paper, the factors affecting the prepreg tack, different measuring methods and different failure modes have been investigated.