Squeezed Creep Flow of Resin

Since Qi lL 1, expanding the right-hand side of Eq. (37) with respect to hJL and retaining the first order term give 

The present analysis shows that the thermal deconsolidation of thermoplastic matrix composites is primarily attributable to two essential factors. One is the decompaction behavior of the fiber network, and the other is the elasticity of the matrix melt. The decompaction of fiber network produces the driving force for void growth, and the elasticity of the matrix melt enables the matrix melt to carry the traction. Other phenomena, such as migration of voids and reconsolidation may also appear in a thermal deconsolidation process. These issues will be discussed in a future work. 

It is shown in the present chapter that the apparent migration of voids during thermal deconsolidation is not really due to the movement of voids. Instead, it is actually a process of void formation and closure. Reconsolidation is another event associated with the migration of voids. In addition to the requirement that the temperature of the matrix must be sufficiently high so that the melt is in a fully liquid state, whether or not reconsolidation takes place also depends on the ratio of the external load to the compressibility of the fiber reinforcement in the second run of compression. An adequate external load is the sufficient condition for the suppression of deconsolidation and the realization of reconsolidation, but it may also result in a considerable squeezed flow of matrix, which should be carefully considered to keep a balance between the two events. 

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