An acrylic (PMMA) window is clamped in a low carbon steel frame at T = 20 C. The temperature falls toT = -20 C, putting the window under tension because the thermal expansion coefficient of PMMA is larger than that of steel. If the window was stress-free at 20C, what stress does it carry at -20 C? Use the result that the bi-axial stress caused by a bi-axial strain difference ∆ε is σ= E∆ε
where E is Young’s modulus for PMMA and Poisson’s ratio ν= 0.33.
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