Although many researchers have reported the increase in Young’s modulus and decrease in CTE of polymers due to addition of nano-fillers, few studies have so far been carried out to experimentally to investigate the effects of nano-fillers on the values of residual stresses in polymer composites. Nishino et al. (2009)considered the effect of tangusten zirconium phosphate (Zr2(WO4)(PO4)2) (ZWP) particles on CTE of polyetheretherketone (PEEK) polymers and experimentally showed that these particles significantly reduce residual stresses in the PEEK/Al plate. They showed that by incorporating 40 vol% ZWP particles (with negative CTE), the CTE of the PEEK composite can be reduced by about 62%. Also, Hsiao and Gangireddy (2008) utilized CNFs to control dimensional tolerance of glass/polyester laminated composites. They presented an integrated modelling and experimental investigation about the effect of CNFs on the spring-in phenomenon in L-shaped composite parts. Their analytical model and experimental results clearly explain how the CNF-enhanced dimensional tolerance control is accomplished through the reductions in the CTE of the polymeric matrix, resulting in reduction of spring-in angle in L-shaped composites.