Material strengths - PowerPoint PPT Presentation

3.5 STRAIN ENERGY

 F = σ  A = σ (  x  y ). 3.5 STRAIN ENERGY. When material is deformed by external loading, energy is stored internally throughout its volume Internal energy is also referred to as strain energy Stress develops a force, . σ  2. ∆ U ∆ V. u =. =. σ 2 2 E. σ . σ 2. ( ).

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Boston Big Dig Tunnel Collapse

Boston Big Dig Tunnel Collapse. By Reina Lipscomb. Overview. On July 10, 2006, the ceiling of the Interstate 90 tunnel collapsed, killing a woman. The tunnel was part of a $14.6 billion reconstruction project.

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