We want to bond together two slabs of a solid material, each with a thickness of 1.5 cm, to form a laminate by using a thin layer of a thermosetting glue, which fuses and forms a bond between the two plates when the temperature is brought to 150°C. To accomplish this, the two plates are pressed between two metal plates maintained at a constant temperature of 200°C.

(a) Determine how long will the two materials have to be pressed together between the metal plates if they are initially at 20°C using the full series solution.

(b) Compare your answer in

(a) with that obtained from Fig. 5.12 and with that obtained using just the first term in the series solution. Data: The thermal diffusivity of the solid material is 1.2

× 10⁻³ cm²/s.

FIGURE 5.12:

Transcribed Image Text:

Centerline Time Xx=0 To X =B Surface at T Ta Fluid at Ta