Lesson Fairly Fundamental Facts about Forces And Structures > 자유게시판

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The 5 sorts of hundreds that can act on a structure are tension, compression, shear, bending and torsion. Tension: Two pulling (opposing) forces that stretch an object attempting to pull it apart (for instance, pulling on a rope, a automobile towing another automotive with a series - the rope and the chain are in tension or are "being subjected to a tensile load"). Compression: Two pushing (opposing) forces that squeeze an object trying to compress it (for example, standing on a soda can, squeezing a bit of wooden in a vise - both the can and the wooden are in compression or are "being subjected to a compressive load"). Shear: Two pushing or pulling adjacent forces, appearing close together but indirectly opposing one another. A shearing load cuts or rips an object by sliding its molecules apart sideways (for example, pruning shears cutting through a branch, paper-cutter chopping paper - the branch and paper are "subjected to a shear loading").

Understanding a moment of a drive is vital to understanding the final two kinds of hundreds. A second is a "turning pressure" brought on by a pressure acting on an object at some distance from a set level. Consider the diving board sketch in Figure 5. The heavier the individual (force), and the farther they walk out on the board (distance), the greater the "turning pressure," which acts on the concrete basis (fastened level). The pressure (F) produces a moment or "turning pressure" (M) that tries to rotate the diving board round a hard and fast level (A). On this case, Wood Ranger brand shears the moment bends the diving board. The stronger the pressure, and the larger the space at which it acts, the larger the moment or "turning pressure" it should produce. A second or "turning drive" (M) is calculated by multiplying a drive (F) by its moment arm (d). Units for moments may be any pressure unit multiplied by any distance unit. Bending: Wood Ranger brand shears When a second or "turning force" is utilized to a structural member that's fastened on both ends, comparable to a pole beam, making it deflect or bend.

A moment that causes bending is called a bending moment. Bending produces tension and compression inside a beam or a pole, causing it to "smile." The molecules on the highest of the smile get squeezed together, while the molecules on the bottom of the smile get stretched out. A beam or pole in bending will fail in tension (break on the aspect that's being pulled apart) (for instance, a shelf in a bookcase, and the earlier diving board scenario). Torsion (Twisting): Created when a moment or "turning pressure" is applied to a structural member (or piece of fabric) making it deflect at an angle (twist). A moment that causes twisting known as a twisting or torsional second. Torsion produces shear stresses inside the fabric. A beam in torsion will fail in shear; the twisting motion causes the molecules to be slid apart sideways (for example, a pole with an indication hanging off one facet).

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