Warpage of glass-fabric/epoxy laminates was measured and analyzed. Two composite materials were investigated, both having a style 109 woven E-glass fabric as the reinforcement. The matrices were an epoxy novolac system (FR-4) and a Dow epoxy resin. 'Unidirectional' laminates of the two material systems were fully characterized physically and mechanically as a function of temperature. The second of the two materials (Dow epoxy resin) showed higher mechanical properties of stiffness and strength and better retention of these properties with increasing temperature than the glass/FR-4 system. This is due to the higher glass transition temperature (Tg) of the Dow epoxy resin. Unidirectional, crossply symmetric and crossply antisymmetric laminates were fabricated and their warpage measured by means of projection moire. The warpage was also calculated by means of lamination theory using the thermal and mechanical properties measured.
|Original language||English (US)|
|Number of pages||4|
|Journal||Annual Technical Conference - Society of Plastics Engineers|
|State||Published - Dec 1 1987|
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