Raw Panels1 GLASS TRANSITION TEMPERATURE n At temperatures < T g u board is stronger u board is stiffer.

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Presentation transcript:

Raw Panels1 GLASS TRANSITION TEMPERATURE n At temperatures < T g u board is stronger u board is stiffer

Raw Panels2 COEFFICIENT OF THERMAL EXPANSION L  HEAT Coefficient of thermal expansion  T = T 2 - T 1

Raw Panels3 Example Find the free expansion of a 10 inch copper bar heated from 25 to 45 o C. CTE copper = 170 x in/in/ o C  T = = 20 C o  = (L)(CTE)(  T ) = (10 in)(170 x in/in/ o C)(20 C o ) = 3.4 x in = 3.4 mil

Raw Panels4 COEFFICIENT OF THERMAL EXPANSION n If temperature < Tg, CTE is higher, thus deformation  increases

Raw Panels5 COEFFICIENT OF THERMAL EXPANSION n Laminates (e.g. glass-epoxy) cause CTE to be lowered in direction of fibres but not perpendicular to them Metal barrel or (via) tries to expand and cracks