Impact characteristics and impact toughness are important mechanical properties of ring forgings, which are used to evaluate the resistance and fracture behavior of materials under impact load. The following is some information about impact characteristics and impact toughness evaluation of ring forgings:
- Impact characteristics: Impact characteristics refer to the response of the material under impact load, including the stress-strain relationship, fracture mode and energy absorption capacity of the material under impact load. Impact characteristics can be obtained by impact test, commonly used test methods include impact strength test (Charpy test) and impact toughness test (Izod test). The evaluation of impact characteristics mainly includes rupture form, impact absorption energy, strength and toughness.
- Impact toughness: Impact toughness refers to the resistance to crack growth and fracture of the material under impact load. The impact toughness evaluation is mainly carried out by measuring the total impact energy absorbed by the impact specimen before fracture. The commonly used impact toughness parameters include impact absorption energy, fracture morphology and fracture toughness. Among them, the impact absorption energy is an important index to evaluate the impact load resistance of the material, the fracture morphology can reflect the fracture mode and energy absorption mechanism of the material, and the fracture toughness represents the impact energy absorbed per unit area.
- Impact test: Impact test is an important method to evaluate the impact characteristics and impact toughness of materials. The commonly used impact test methods are Charpy test and Izod test. In the Charpy test, the specimen is fixed at one end and the impact energy absorbed before the specimen breaks is measured by striking the other end with a drop hammer. In the Izod test, the sample is clamped on a bracket, and the edge part of the sample is impacted by a drop hammer, and the impact energy absorbed by the sample is also measured.
- Impact characteristics evaluation criteria: The evaluation of impact characteristics and impact toughness is often carried out according to the corresponding standards. In the field of steel, the commonly used impact characteristics evaluation standards are ISO 148, ASTM E23 and GB/T 229-2007. These standards specify the shape and size of the sample, test temperature and other detailed requirements, and provide the corresponding evaluation methods and parameters according to different materials and application fields.
In short, impact characteristics and impact toughness are important indexes to evaluate the impact resistance and fracture behavior of ring forging materials. Through the impact test and the corresponding evaluation standard, the impact characteristic parameters of the material can be obtained, and then the adaptability and safety performance can be judged, and the basis for engineering design and application can be provided.
