Introduction to Instron® Universal Testing Machines

Summary

In this video, John from Instron introduces Universal Testing Machines (UTMs), highlighting their role in applying precise forces to specimens to predict real-world performance. Key components of the system include the frame, crosshead, load cell, and various grips, with a focus on safety features like the emergency stop button and limit switches. The video covers machine setup, including powering on, calibrating the load cell, using the crosshead for specimen testing, and selecting the correct grips. It serves as an introduction to using the UTM safely and effectively, stressing the importance of consulting the operator's guide for detailed instructions.

Takeaways

• 😀 Universal testing machines apply force to specimens in various ways (e.g., pushing, pulling, twisting) and measure the forces involved.
• 😀 These machines help predict how a specimen will perform in real-world conditions by measuring the forces applied during tests.
• 😀 The key components of the system include the frame, cross-head, load cells, grips, and software for controlling the machine.
• 😀 The emergency stop (e-stop) button is an important safety feature that immediately halts the movement of the cross-head in case of an emergency.
• 😀 The cross-head can be moved using up/down buttons or a thumb wheel for finer adjustments, ensuring safe and precise specimen loading and testing.
• 😀 Load cells are crucial for measuring the forces experienced by specimens, and each load cell has a specified maximum force capacity to prevent damage.
• 😀 Calibration of the load cell is recommended once per shift or every 8-12 hours to ensure accurate force measurements during testing.
• 😀 Grips or fixtures used in testing determine the type of test you can perform and can be swapped out depending on the material or test requirements.
• 😀 Pneumatic grips can be actuated by a foot switch or individual grip switches, and they are essential for loading and testing specimens securely.
• 😀 Limit switches must be set before testing to prevent collisions between grips and fixtures when the cross-head moves during testing.
• 😀 The video emphasizes consulting the operator's guide and your lab manager for specific instructions before running any tests, ensuring safety and proper setup.

Q & A

What is the primary purpose of a universal testing machine?

A universal testing machine is designed to apply force to a specimen in various ways (such as pushing, pulling, or twisting) and measure the forces being applied. This data helps predict how the specimen will perform in real-world applications.

What are the key components of a universal testing machine?

The key components of a universal testing machine include the frame, crosshead, load cells, extensometers, grips, signal conditioner modules (SCMs), and an operator dashboard (computer with software).

How should you turn on the universal testing machine?

To turn on the system, flip the power switch on the back of the machine. The system will then go through a self-test. Once the test is complete, turn on the operator dashboard and open the Blue Hill software.

What is the function of the emergency stop button (E-stop) on the machine?

The E-stop (emergency stop button) is used to immediately stop the movement of the crosshead if necessary. Once the issue is resolved, the E-stop can be reset, and the machine can continue operation.

What are the two methods for moving the crosshead on the testing machine?

The two methods for moving the crosshead are: using the up and down buttons on the handset for larger, safer movements and using the thumbwheel for more precise, smaller movements.

What is the load cell, and why is it important?

The load cell measures the forces experienced by the specimen during testing. It is crucial not to exceed the load cell’s rated capacity, as doing so can damage the load cell and affect the accuracy of the test.

How do you ensure that the load cell is not damaged during testing?

Ensure that the force applied during testing does not exceed the load cell’s rated capacity. Additionally, avoid exceeding the testing frame's capacity, and consider the weight of any fixtures, which could reduce the load cell's usable capacity.

Why is it important to calibrate the load cell, and how often should it be done?

It is important to calibrate the load cell regularly to ensure accurate measurements during testing. Calibration is recommended once per shift or every 8-12 hours.

What types of grips are used with the universal testing machine?

Grips are fixtures that hold the specimen in place during testing. The type of grip depends on the test being conducted. The video mentions pneumatic side-action grips, which are adjustable and can handle forces up to one kilonewton.

What is the purpose of the specimen alignment device?

The specimen alignment device helps load specimens correctly and consistently, ensuring accurate and reproducible results during testing.