Tack Property of Prepregs: Effective Parameters, Methods of Measurement and Failure Mechanisms

Document Type : compile

Authors

1 Polymer Engineering-Composite, Integrated Materials and manufacturing Technology, Malek-E-Ashtar university of technology, tehran, Iran

2 Composite Science and Technology Research Center

Abstract

Nowadays, due to the development of automated composite manufacturing processes
on prepregs, it is necessary to recognize the main properties and factors affecting
prepregs. 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. The 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 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 interchanging 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.

Keywords

Main Subjects

References

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