Скачать или смотреть Shear Stress and Strain | Engineering Fundamentals

Welcome back! Get ready because today we are leaving the world of stretching and pulling behind and jumping headfirst into the world of slicing and shearing! You already know that Hooke's law is the golden rule for predictable stretching, and that the Modulus of Elasticity ($E$) is a material's stiffness score. But here’s the big question: What happens when you’re not pulling on something? What happens when you push from the side, or try to slice right through it? We are diving deep into Shear Stress and Strain, and I promise you will be seeing these sheer forces everywhere—from a simple pair of scissors all the way to how bolts hold a massive bridge together!

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Today we tackle Section 1.6: Shear Stress and Strain! The difference between stretching (normal stress) and slicing (shear stress) boils down to one simple thing: the direction of the force. Normal stress is perpendicular, like pulling a rope straight apart; Shear Stress ($\tau$) is parallel to the surface, causing a sliding, slicing motion. We explain how forces literally try to slice bolts at specific points (direct shear force).
Learn the formula for the intensity of this slicing force: Shear Stress ($\tau$) equals the shear force ($V$) divided by the area ($A$) it’s acting on.
We then examine the material's reaction, Shear Strain ($\gamma$), which is not about getting longer, but about changing shape (distortion), turning a square into a rhomboid. The $\gamma$ symbol measures how much that original $90^\circ$ right angle has changed.
Finally, we reveal the "sequel" to the golden rule: Hooke’s Law for Shear, $\tau = G \cdot \gamma$. Here, $G$ is the Shear Modulus—the material's stiffness score against being sliced or distorted. We see this in action with hole punching in steel (creating 44,200 PSI of slicing pressure!) and the leaning distortion of rubber bearing pads.
Shear stress is a parallel, slicing force, and shear strain is the change in shape it causes.
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Don't miss the next one: Now that we know about these stresses, the critical question is: how much is too much? We dive into allowable stresses and allowable loads in Section 1.7! Hit like and follow so you don't miss out!.


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