Glass, Plastics, and Non-ferrous Metals — Worked Examples

A $2.00\text{ m}$ aluminum frame and adjacent glass edge experience a $30.0^\circ\text{C}$ temperature rise. Use $\alpha_{Al}=23\times10^{-6}/^\circ\text{C}$ and $\alpha_g=9\times10^{-6}/^\circ\text{C}$. Determine free differential movement.

A low-level door sidelight is vulnerable to human impact. The architect proposes ordinary annealed glass because its nominal thickness matches nearby windows. Determine the materials-safety review.

Two nominally identical annealed glass coupons fail at noticeably different tensile stresses. Explain why this does not necessarily indicate a manufacturing error.

A polymer component has an initial elastic deformation of $8.0\text{ mm}$. Under the product's stated service condition, a validated creep factor for the design period is 1.5, meaning additional creep deformation equals 1.5 times the initial elastic deformation. Determine total deformation for this simplified model.

A straight $24.0\text{ m}$ HDPE pipe experiences a $25.0^\circ\text{C}$ temperature rise. For this simplified example use $\alpha=1.3\times10^{-4}/^\circ\text{C}$. Determine free thermal expansion.

A facade joint is $20\text{ mm}$ wide at installation and is expected to cycle between 16 mm and 24 mm. Determine the movement relative to the installation width and what should be checked before selecting sealant.

An aluminum curtain-wall bracket is proposed in direct wet contact with an uncoated carbon-steel support near the coast. Determine the interface-control strategy.

A double-glazed insulating-glass unit develops fogging between panes several years after installation. Determine the material-system failure mechanism to investigate first.