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HOMEWORK ΜΕ ΑΠΑΝΤΗΣΕΙΣ ΣΤΑ ΠΟΛΛΑΠΛΗΣ (ΕΛΕΓΞΤΕ ΤΟ ΚΙΟΛΑΣ)

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HOMEWORK ΜΕ ΑΠΑΝΤΗΣΕΙΣ ΣΤΑ ΠΟΛΛΑΠΛΗΣ (ΕΛΕΓΞΤΕ ΤΟ ΚΙΟΛΑΣ)

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mod_6_homework__1_  με απαντησεις στα πολλαπλής

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Αυτή η εικόνα είναι από το βιβλίο της εταιρείας . Προσέξτε γιατί υπάρχουν διάφορες βιβλιογραφίες.Βλέποντας όμως αυτό, ξεκαθαρίζει για το τι θέλουμε ως σωστή απάντηση

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Αυτή η εικόνα είναι από το βιβλίο της εταιρείας . Προσέξτε γιατί υπάρχουν διάφορες βιβλιογραφίες.Βλέποντας όμως αυτό, ξεκαθαρίζει για το τι θέλουμε ως σωστή απάντηση

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CLICK HERE FOR INDEX PAGE

MATERIALS - HARDNESS TESTING

V. Ryan © 2012

PDF FILE - CLICK HERE FOR PRINTABLE WORKSHEET

VIDEO - - HARDNESS TESTING OF MATERIALS

The hardness of a material can be defined as, 'the ability of a material to resist scratching, wear and tear and indentation'.

Using a centre punch to 'indent' the surface of a material, is a basic test. Different materials require a different amount of force to form an indent. This makes it possible to compare the hardness of a selection of materials.

When using a hand file to 'file' a material, the force / effort required can be felt physically . Filing a selection of materials to the same degree, allows the hardness of each to be compared.

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.

CLICK HERE FOR RESISTANT MATERIALS INDEX PAGE

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The hardness of a material can be defined as, ‘the ability of a material to resist scratching, wear and tear and indentation’.

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Hardness testing (Brinell, Vickers and Rockwell test method)

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