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Simple Stresses and Strains

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Simple Stresses and Strains In strength of materials we study how solid bodies behave when different kinds of forces act on them. Whenever you load a bar, a rod or any machine part, its shape or size changes a little. If the load becomes too large, the member may finally fail. To understand and design safe components, we use the basic ideas of stress and strain . 1.1 Introduction Imagine pulling a steel rod. Your hands apply a force, so the rod tries to stretch. The material of the rod opposes this stretching because of the internal bonding between its particles. This internal opposition is what makes the material “strong”. Up to a certain level of load the rod comes back to its original length as soon as the force is removed. This region is called the elastic region. Within this limit the internal resistance developed in the material is in step with (proportional to) the amount of deformation. If the load is increased beyond the elastic limit, the mater...
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What is Mechanical Engineering?

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What is Mechanical Engineering? Mechanical engineering is one of the core branches of engineering that deals with machines, motion, forces, and energy . Whenever you see something that moves, transfers power, converts energy, or performs mechanical work – from a bicycle pedal to a jet engine – there is mechanical engineering behind it. In simple words: mechanical engineering is the science and art of designing, analyzing, and improving machines and mechanical systems . It connects physics, mathematics, materials, and creativity to build real-world solutions. Simple Definition You can think of mechanical engineering as the branch that answers questions like: How much force is needed to move this object safely? Which material is strong enough but still lightweight? How can we make this machine more efficient and use less energy? How do we remove heat from this engine so it doesn’t fail? How can ...
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