How To Select A Suitable Tensile Testing Machine
Guide you how to select a suitable tensile testing machine
Link to Cell Instruments
For customers who find it challenging to select an appropriate tensile testing machine, this article aims to provide some guidance.
First, evaluate the maximum testing force of the material you wish to test.
Determine whether the material is metallic or non-metallic. By calculating the specimen's cross-sectional area and its tensile strength, you can ascertain the tensile force required.
Typically, non-metallic materials, such as rubber, require lower testing forces, often below 20 kN. In contrast, metallic materials generally demand more substantial forces; for instance, testing a 32 mm rebar could require a maximum force of around 500 kN.
For a load range between 1 kN and 300 kN, it is advisable to use an electromechanical universal testing machine (UTM), specifically the WDW series. In cases where the load exceeds 300 kN, a hydraulic servo UTM (WAW series) would be more appropriate.
Examples include the WDW-5 (5 kN), WDW-10/20/50/100 (10 kN, 20 kN, 50 kN, 100 kN) and WAW-300E/600E.
Next, select the appropriate grip system.
Different materials come in various shapes and sizes, necessitating different grip types. Choosing the right grip is crucial to enhance testing efficiency and prevent damage to the specimen or grip slippage during tensile tests. Available grip systems include wedge tensile grips, pneumatic grips, hydraulic-operated tensile grips, and rotating grips.
Lastly, determine the testing standards or results you aim to achieve.
Identify the standards relevant to your testing process. For example, tensile tests on metallic materials at room temperature usually follow ISO standards.
Additionally, consider the specific results you wish to obtain, such as maximum testing force, tensile strength, yield strength, elongation rate, and modulus of elasticity.
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Each grip should match certain specimen dimensions based on the width of its jaws. Moreover, some grips may feature additional opening specifications. For instance, the GV-5T 5 kN vise grips come with three different opening sizes: 24 mm (0.94 in), 50 mm (1.97 in), and 100 mm (3.94 in).
When selecting grips, having the precise dimensions of the specimen in mind is essential. The operation principle of webbing grips involves wrapping the specimen around a drum, which requires a specific minimum sample length besides accommodating the maximum sample width and thickness.
Beyond tensile testing, other testing methods also depend on the specimen material specifications, notably compression and flexural testing.
Our sales engineers will request specimen specifications while recommending additional accessories like extensometers and displacement transducers. Understanding the gauge length and total travel range (based on specimen elongation or deflection) guides us in suggesting the most suitable displacement transducer for your testing needs.
For more information regarding the right tensile grips for your application, click on the link below:
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In conclusion, selecting an appropriate tensile testing machine involves evaluating key aspects such as the specimen material, testing type, testing standards, and capacity. It is also vital not to overlook the specifications of the grips and fixtures you will employ during testing. Doing so will help ensure that you achieve reliable and pertinent results tailored to your requirements.
If you have any questions about identifying the right universal testing machine, please don’t hesitate to reach out!
Are you also interested in Digital Test Stand? Contact us now for tailored advice!
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