The fracture toughness test methods of tungsten wire mainly include the following:
- Indentation fracture method
Principle:
The indentation fracture method is to evaluate the fracture toughness of the material by applying a certain indentation load on the surface of the tungsten wire and observing whether cracks are generated near the indentation. This method usually uses a Vickers hardness tester for detection, while recording the length of the indentation diagonal, the crack length and the Vickers hardness value, and calculating the fracture toughness of the material through a specific formula.
Steps:
Prepare the tungsten wire sample to ensure that its surface is flat and defect-free.
Use the Vickers hardness tester to apply an indentation load on the surface of the tungsten wire, usually selecting a load of 5N or 10N, and repeat the test several times to improve the accuracy of the results.
Observe and record the length of the indentation diagonal, the crack length and the Vickers hardness value.
The fracture toughness of the tungsten wire is calculated according to the formula.
- Bending test method
Principle:
The bending test method is to pre-notch the tungsten wire sample and apply a gradually increasing bending force until the sample breaks. By measuring the applied force and the amount of deformation at fracture, the fracture toughness of the material can be calculated.
Steps:
Prepare a tungsten wire sample with a prefabricated notch.
Place the sample on a bending tester and apply a gradually increasing bending force.
Record the force and deformation when the sample breaks.
The fracture toughness of the tungsten wire is calculated according to the formula or standard.
- Single-edge notch tensile test (SENB)
Principle:
The single-edge notch tensile test is to prefabricate a single-edge notch on the tungsten wire sample and apply a tensile force until the sample breaks. By measuring the load at fracture and the geometric dimensions of the sample, the fracture toughness of the material can be calculated.
Steps:
Prepare a tungsten wire sample with a single-edge notch.
Place the sample on a tensile tester and apply a tensile force.
Record the load at fracture and the geometric dimensions of the sample.
The fracture toughness of the tungsten wire is calculated according to the formula or standard.
- Needle impact method
Principle:
The needle impact method uses a fast-moving sharp object to act on the surface of the tungsten wire to promote the generation of cracks. The fracture toughness of the material can be evaluated by analyzing the crack propagation and energy absorption.
Steps:
Prepare the tungsten wire sample and ensure that its surface is flat and free of defects.
Use an impact tester to perform an impact test on the tungsten wire sample and record the crack propagation and energy absorption.
Analyze the fracture toughness of the tungsten wire based on the test results.
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