Every material used in the real world undergoes some form of testing. It helps manufacturers determine whether that specific material is suitable for use. Generally, UTM machines are used in testing those materials. However, these testing machines sound technical and confusing for beginners. That’s where this guide comes in — it covers the basics of a UTM machine and should be very helpful for beginners.
Interestingly, people often associate UTM machines with specific tests, which isn’t accurate. This testing machine is universal, meaning it can test a wide range of materials. Additionally, it tests materials for various parameters to assess their reliability. In this article, I will explain everything about UTM machines and how they work. So, let’s get started!
What is a UTM Machine?
First things first – UTM stands for “Universal Testing Machine”. It refers to a single machine that tests materials from multiple aspects or parameters.
A UTM is a machine commonly used in laboratories for extensive material testing. Specimen is subjected to various forces or loads. In simple terms, it checks how a material behaves in real-world conditions. The material that passes through these machines is considered reliable. Manufacturers can confidently use it to produce a variety of products.
What makes this machine stand out is its ability to test materials across various parameters. These include tensile strength, compressive strength, elasticity, and breaking point. Suppose a rubber material is tested using the UTM. This machine will demonstrate its elasticity by pulling on one end. On the other hand, if a metal is tested, it will check how much force it can withstand before breaking.
UTM machines are connected to a dedicated computer system. During testing, the operator can view a graph on the screen showing the values of different parameters. These machines display exact values of the mechanical properties of the materials. Each material used in real-world conditions has different properties and behavior.
Understanding those behaviors is key when they are being used to make different products. Modern manufacturers use materials only if they are tested and passed through UTM machines. UTM machines are not limited to testing a few materials. Instead, it is compatible with a wide range of materials, including metals, wood, rubber, plastic, and concrete.
Components of a UTM Machine
UTM is a standalone device that performs multiple tests. However, it consists of various components for its operation. The list of UTM machine components is as follows:
- Load Cell
- Crosshead
- Load Frame
- Drive System
- Control Panel
- Grips and Fixtures
Each of these components plays a role in the operation of UTM machines. A load frame is an integral component that holds all the other components of UTM. Since it holds all the elements, it is made with robust materials such as steel. The crosshead is the part that moves up or down to pull or press the material under the test. Wondering how the crosshead moves?
That’s where the drive system comes in. This drive system uses a dedicated motor to move the crosshead with optimal control. Grips and fixtures serve as holding devices, keeping the workpiece firmly in place. Lastly, the control panel is an interface that shows the real-time readings and a graph. It shows how a material behaves when it undergoes UTM testing.
How Does a UTM Machine Work? (Step-by-Step)
Here is the working principle of a UTM machine:
The UTM’s operation is based on mechanical force. The machine applies a gradually increasing force to the test material. This force can either pull or push the material depending on the type of test. In this way, it checks how a material performs under various forces. If a material can sustain the load, it is considered reliable for manufacturing different products.
UTM uses mechanical force to test materials for various purposes. Here’s a step-by-step guide on how UTM works:
1- Material Analysis and Selection
First, operators choose the right materials. Not all the material is loaded onto the test machines. Instead, operators generally cut a small part of a large material and test it. It is understood that the properties of a small sample are representative of the entire material. Remember, you can only load a small piece of material into a UTM machine. When it comes to the type of material, there are no limits. You can choose metal, composite, rubber, and more.
2- Mount the specimen or workpiece in the UTM machine
Once the material is ready, the next step is to mount it on a UTM machine. As I said earlier, every UTM machine comes with grips and fixtures. The material is attached to one of these grips, and the fixture holds it in place. One grip of a UTM machine is fixed and directly responsible for holding the specimen in place. On the other hand, the second grip on the UTM machine is movable, attached to the crosshead. This crosshead moves to apply different forces on the material.
3- Set Test Parameters on UTM Machine
As mentioned above, a UTM is a universal testing machine capable of conducting a wide range of tests. After mounting the material, you cannot start testing immediately. Instead, you’ll have to set testing parameters and type on the control panel of the machine. For example, you’ll have to add tensile testing, so the load cell of a UTM machine will apply pulling force to the specimen. On the other hand, it would exert a compressive force during compression testing. Each test type requires a different force from a UTM machine’s load cell.
4- Start the UTM Test with Controlled Force
Once you’ve adjusted the parameter, it’s time to start the UTM test. To do this, touch the start option on the machine’s interface. The components of the machine will start performing their specific roles. The load cell will exert force, and the crosshead will move. The material or specimen will be subjected to a specific type of force. This force must be gradual and increasing. Test speed generally depends on the type of material being tested. For softer materials, I recommend a slightly faster speed; for harder materials, i.e., metals, a somewhat slower speed.
5- Monitor and Analyse Test in Real Time
During the test, a UTM machine’s interface displays real-time data. It shows the force applied to the specimen. Additionally, it provides information about the behavior of a specific object under applied force. You must monitor the force’s changes on the specimen. This will help analyze a material’s performance with precision. You’ll also know about the maximum extent to which different materials can withstand. Remember, when the test ends, you’ll also be able to see the stress-strain curve on the screen.
Applications of the UTM Machine
A UTM machine has become a necessity in almost every industry. Manufacturers use it to check the mechanical properties of materials before using them. In the section below, I’ll discuss some popular applications of a UTM machine:
1- Automotive Industry
Vehicles undergo different use cases. From off-roading to high-speed racing, they encounter a wide variety of conditions. So, their parts must be made of reliable materials and must be strong to withstand shocks. Manufacturers generally test both engine and suspension components using UTM machines. As a result, they can withstand harsh bumps and remain in good shape. Both metal and plastic automotive parts are checked through these UTM machines.
2- Aerospace Industry
The use of UTM machines is standard in the aerospace industry. This section typically uses aluminum or titanium alloys. Why? That’s because these materials are both lightweight and highly strong. Manufacturers use UTM testing to ensure these materials withstand both tensile and compressive forces. The aircraft parts made from these materials withstand harsh pressure and temperature conditions.
3- Construction Industry
Concrete and metals are two prominent materials used in the construction sector, right? Metal beams and columns must be strong to withstand the heavy loads of buildings. Manufacturers use UTM machines to test the concrete and metals used in the making of beams and columns. This ensures that large buildings, bridges, and other structures remain durable. They can even withstand harsh weather and mild earthquakes and offer excellent longevity.
4- Plastic & Rubber Industry
UTM machines play a key role in the plastics and rubber sector. It would be safe to say that these two materials are widely used. From toys to seals and hoses, these materials are useful. However, they are tested using UTM for their tensile and compressive strength. This gives manufacturers an idea of whether a rubber or plastic is durable enough to be used in making different products. These machines also provide insight into the elasticity of both rubber and plastics.
5- Medical Device Industry
You’ll also see UTM machines used in the medical sector. Various medical devices require both strength and elasticity. To make such devices, manufacturers use UTM to identify the right materials. Such materials are checked for both elasticity and strength. Additionally, plastic syringes, tubes, or implants are also tested through UTM machines. That’s proven to help maintain the quality and durability of medical equipment.
Conclusion
Let’s conclude: UTM machines are handy for ensuring material quality. Without them, it would have been challenging to assess materials and their behavior against different parameters. Remember, UTM machines are single devices, but they help test a material’s mechanical properties. For example, it tests how material behaves when either pulled, pushed, or pressed. Additionally, you’ll also find the elasticity of different materials. In this article, I’ve explained the basics of these machines, including their working and applications.