Charpy Impact ISO 179
Charpy Impact Test: Understanding Material Toughness through Impact Resistance
The Charpy Impact Test is a widely used single point test that measures the ability of a material to withstand impact from a swinging pendulum. The test determines the kinetic energy required to initiate and propagate fracture in the specimen, until it is completely broken. This valuable information can be used for quality control, product development, and to differentiate between general toughness of different materials.
Test Procedure
The Charpy Impact Test involves mounting the specimen horizontally and supporting it unclamped at both ends. A hammer of specified weight is then released from a fixed height to strike the specimen at a notched or unnotched point. The energy absorbed by the specimen is measured by the difference in the height of the hammer before and after the impact. If the specimen does not fracture, a heavier hammer is used until failure occurs.
Specimen Size
Specimens for the Charpy Impact Test are typically rectangular with a length of 80 mm, width of 10 mm, and variable thickness. The specimens can be either notched or unnotched depending on the material properties and the desired test results.
Data
The impact energy is expressed in joules and is calculated by measuring the difference between the height of the hammer before and after the impact. The impact strength is determined by dividing the impact energy in joules by the area under the notch of the specimen. A higher value of impact strength indicates a tougher material.
Applications
Charpy Impact Test is an essential tool for quality control in various industries such as construction, aerospace, automotive, and manufacturing. This test can provide valuable information about a material's impact resistance, which is critical for designing and developing products that can withstand the effects of external forces.
In our opinion, the Charpy Impact Test is a simple and effective method to determine the toughness of a material. By measuring the energy absorbed during an impact, the test provides valuable information about a material's behavior under sudden impact loads. The results obtained from the Charpy Impact Test can be used to optimize the selection of materials for specific applications and improve the safety and performance of products.