Non-destructive testing is based on the premise of not impairing the performance of the object under test, applying various physical principles and chemical phenomena, and effectively testing and testing various engineering materials, parts and structural parts to evaluate their continuity and integrity,safety and reliability and some physical properties.
Non-destructive testing is divided into three stages of development
1. NDI (Nondestructive Testing):It is mainly used for the final inspection of products, and the defects in the parts are found without destroying the products to meet the needs of the strength design of the parts in the engineering design.
2. NDT (Nondestructive Testing):Not only the final product inspection, but also the process parameters such as temperature, pressure, density, concentration, composition, microstructure, residual stress, and grain size.
3. NDE (Nondestructive Assessment):In addition to the above tests, it is also necessary to grasp the load conditions and environmental conditions of the materials used, comprehensively evaluate the material integrity, and judge the performance and reliability of the materials and components.
Non-destructive testing is mainly used in aerospace, petrochemical, nuclear power plants, railways, shipbuilding, metallurgy, construction, machinery and other fields.
Areas of non-destructive testing:
The physical properties of materials, manufacturing public welfare, product involvement, fracture mechanics, automatic control, data processing, pattern recognition and other disciplines and professional technical fields. The basic principles of various non-destructive testing methods involve almost every branch of modern physics.
Evaluation object of non-destructive testing technology
1. Evaluation of batch product quality events
2. Important parts failure analysis evaluation and safety prediction evaluation
3. Evaluation of new products, new processes and new technologies in product trial production and trial use
Non-destructive testing calm home content and methods
1. The evaluation content of non-destructive testing technology is mainly the safety evaluation. The stress, defects and mechanical properties of the material are the three elements of the evaluation.
2. According to different failure modes (static failure mode and dynamic failure mode), the safety evaluation can be divided into three types: fracture safety evaluation, plastic failure safety evaluation and fatigue safety evaluation.
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