Non-destructive testing of large molded pieces may be performed using radiation. Discuss what constructive elements a non-destructive testing system should contain, what type or properties they should have, how they should be arranged in relation to the analyzed piece and what information would indicate that a piece has not been molded correctly (e.g. air gaps in the internal structure). Could the size of such an air gap be calculated?

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Strain energy

The term strain indicates the variation in an object's length, area, and volume when the object is subjected to an external force. The external force may be of normal, shear, moment, torque, etc. The strain in an object depends on the types of external force and cross-section of the object. Mathematically, the evaluation of strain can be obtained with the help of elastic constants.