Verified Cracked: Sapphire

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In applications such as watch crystals or smartphone camera lenses, failure is most often caused by high-velocity impact or concentrated point loading. While sapphire is hard, it lacks ductility. It cannot deform plastically to absorb impact energy. When a localized force exceeds the elastic limit, micro-cracks nucleate at surface flaws (Griffith flaws). sapphire cracked

Sapphire possesses moderate thermal conductivity but is susceptible to thermal shock if subjected to rapid temperature gradients. The stress generated by differential thermal expansion can exceed the tensile strength of the material (approx. 400–600 MPa). In thin windows, thermal shock often results in a shatter pattern distinct from impact, frequently initiating from the edges where stress concentration is highest. Below is a proper academic-style paper formatted in