Lecture
| A timber can withstand a greater or lesser load depending on the thickness or on the properties of its material. It is necessary to enter a physical quantity (or characteristic), allowing to take into account these features of the structure's operation under load. |
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| Fig. 1.14 |
| Since the internal forces in most cases are unevenly distributed over the cross section, a characteristic of their intensity is introduced that is equal to the value of the internal forces per unit area (Fig. 1.14). |
| This characteristic is called point voltage: |
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 (sigma) - normal stress, acting normal (perpendicular) to the site; |
 (tau) - shear stresses, they slide along the platform, touch it (Fig. 1.15). |
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| Newton dimension per square meter (Pascal) and megapascal (MPa) |
| Fig. 1.15 |
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Content and basic concepts
Terms: Content and basic concepts