Difference between destructive & nondestructive test :-
Destructive test
Destructive test includes methods where the material is broken down in order to determine mechanical properties.
Example: - Tensile test, bend test.
Nondestructive test
Nondestructive testing is a method that does not damage or destroy the material or product being tested.
Example: - Radiographic test, Ultrasonic test, Magnetic particle test, Liquid penetrant test etc.