What is a spring? Hey Engineering Lovers, you've certainly seen this here, a spring. Something simple, that we have basic applications in everyday life, but that is actually something fundamental for the functioning of various systems.
If you're like me and loved taking things apart, springs are your enemy. Try to put a gadget or machine back together again later and it is the springs that usually make this process difficult, because the question usually comes up: where do they go and how do they fit back together? In their most familiar form, springs are hardened metal coils that help items return to a specific position, but they can also be used to absorb energy as in a car's suspension or store it for long periods of time as in clocks.
You can find springs in everything from automatic doors to even pens. But what exactly is a spring? A typical spring is a tightly wound metal coil or spiral that stretches when you pull it and returns to its original shape when you release it again.
In other words, a spring is elastic. This just means that it is made of rubber, but rather that it has elasticity, where it gets longer when you pull it, as long as you don't stretch it too much, and it returns exactly to its original length when you stop pulling it. Depending on how a spring is made, it can work the opposite way too, where if you squeeze it, it compresses but returns to its original length when the force is removed.
You can make a spring from more or less anything even paper or orange peel, but the types of springs we use in machines work effectively only if they are stiff enough to resist a pulling force and durable enough to be stretched. often without breaking or breaking. Typically, this means they need to be made from materials like steel or strong alloys like bronze.
Some alloys have a property called shape memory, which means they are naturally elastic. And how does a spring work? Imagine you have a piece of straight steel wire about 10 cm long, something like a long paperclip that you have stretched out.
If you pull it with your fingers, it is extremely difficult to stretch it. But if you wrap it around a pencil and with a little effort you can make a small but perfectly functional spring. Now pull or push it with your fingers and you will see that you can stretch and tighten it easily.
But why did this stubborn hunk of metal suddenly become so cooperative? When the material is in its original shape, stretching it involves pulling atoms out of their position in the metal's crystal lattice, and this is relatively difficult to do. When you make a spring, you have to work a little to bend the metal into shape, but it's not nearly as difficult.
As you bend the wire, you use energy in the process and some of that energy is stored in the spring, where it is pre-tensioned, in other words. Once the spring is formed, it is easy to change its shape a little further where the more metal turns a spring has, the easier it is to stretch or compress it. You only need to displace each atom in a spiral spring by a small amount and the entire spring can stretch or compress by a surprising amount.
Springs are great for storing or absorbing energy. When you use a push or pull force to stretch a spring, you are using a force over a distance, so in physical terms you are doing work and using energy. The tighter the spring, the harder it is to deform, the more work you have to do and the more energy you need.
The energy you use is not lost because most of it is stored as potential energy in the spring. Release a stretched spring and you can use it to do work for you. When you wind a mechanical watch, you are storing energy by squeezing a spring.
As the spring releases, energy is slowly released to power the internal gears and rotate the hands around the clock face for a day or so. And what types of springs exist? You might think a spring is a spring — but you'd be wrong!
There are several very different types. The best known are helical springs , which are cylinders of wire wound around a circle with a fixed radius. Coil springs are similar, but the coil gets progressively smaller as you reach the center.
An example of this type of spring is the delicate spring that helps keep time on a watch. Torsion springs work like the rubber band in a catapult or a rubber band twisted repeatedly between your fingers, where they are made of rigid pieces of metal that rotate on their own axis. Leaf springs are stacks of curved metal bars , which are often used in cars.
Also known as bar springs, they are what support the wheels of a car or rail truck and bend up and down to smooth out bumps. Springs also vary in the way they resist forces or store energy. Some are designed to absorb energy and force when you squeeze them, known as compression models.
Torsion springs have horizontal bars at both ends so they can resist something twisting or turning. Sometimes you want a spring that expands and contracts over a longer distance without losing its shape and volute springs are ideal for the job. They are stiff, strong compression springs made from flatter sheets of metal that fit together.
But what materials are springs made of? Springs are usually made from spring steels, which are iron-based alloys with small amounts of carbon, silicon, manganese and chromium. The exact composition of a spring steel depends on the properties you want it to have.
For example, its composition can change according to the loads it will need to withstand, how many stress and deformation cycles it will undergo, the temperatures under which it needs to operate and whether it needs to withstand heat or corrosion. Additionally, it can be specified to conduct electricity, or how "plastic" or easy to shape it needs to be during its initial manufacturing and shaping, and so on. Generally, springs are made from steels with a medium to high carbon content, meaning this means a small amount of carbon in the total mix, but more than you would find in other types of steel.
They usually receive some type of heat treatment, such as tempering, to ensure that they are strong and can withstand many cycles of stress and strain and in other words, so that you can stretch or squeeze them many times without them breaking. Springs often fail from metal fatigue, which means they suddenly break after being repeatedly moved back and forth. At the microscopic level, no spring is truly elastic.
Every time it goes through a cycle of stretching or compressing and then returning to its original size, its internal structure is changing very slightly and small "microcracks" may be forming and growing inside it. At some point in the future it will definitely fail and the spring will break when a crack grows large enough. Materials science teaches us that the way springs are made is extremely important in making them last.
For example, if you don't use the correct hardening temperature when steel is being produced, you will produce weaker steel and a weaker spring that will likely fail more quickly. If you've made it this far and liked the video, take the opportunity to subscribe if you're not already subscribed, leave your like and activate the notification bell. And if you find our content interesting, consider becoming a member to help us continue producing content here at platform and be remembered in our videos.
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