din engleză în română Altele Producţie design

http://www.technologystudent.com/joints/htest1.html A more sophisticated method of measuring the hardness of a material, is to drop a ‘plug’ down a tube. When the ‘plug’ hits the material below, the surface will suffer an indent. The indent produced on different materials, can be compared. Consequently, the smaller the indent, the harder the material.


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