last summer when it was 20-25°c i made a work bench for outside use. i epoxied a 0.5mm ss sheet on top of a mdf board. the dimensions are 120x60 cm.
now during the day (around 20°c) the board arches upwards by 2-3 cm. while the steel sheet gets warmer than that from the sun i still cant understand whats happening. during the night its flat. thermal coefficients seem to be: mdf 12, ss 16, epoxy 55. these are µ/m,k right? so would 4µ times 20-30°k times 1.2m = 100-150µ cause this arching? i assume the epoxy layer has nothing to do with it because of its low modulus. it should mitigate the effect.
i was planning to bolt the board down to the steel frame, but now i cant.
now during the day (around 20°c) the board arches upwards by 2-3 cm. while the steel sheet gets warmer than that from the sun i still cant understand whats happening. during the night its flat. thermal coefficients seem to be: mdf 12, ss 16, epoxy 55. these are µ/m,k right? so would 4µ times 20-30°k times 1.2m = 100-150µ cause this arching? i assume the epoxy layer has nothing to do with it because of its low modulus. it should mitigate the effect.
i was planning to bolt the board down to the steel frame, but now i cant.