mm lab 104 - MECHANICS OF MATERIALMANUAL ASSIGNMENT...

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MECHANICS OF MATERIALMANUAL & ASSIGNMENT Assignment 2007-MECH-104 Page 1
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Submitted to: SIR AWAIS Submitted By: MUHAMMAD SOHAIB UR REHMAN (2007-MECH-104) Experiment # 1 To determine the hardness of a given specimen. HARDNESS R e s i s t a Assignment 2007-MECH-104 Page 2
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n c e o f m e t a l t o p l a s t i c d e f o r m a t i o n , u Assignment 2007-MECH-104 Page 3
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s u a l l y b y i n d e n t a t i o n . H o w e v e r , t h e t e Assignment 2007-MECH-104 Page 4
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r m m a y a l s o r e f e r t o s t i f f n e s s o r t e m p Assignment 2007-MECH-104 Page 5
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e r , o r t o r e s i s t a n c e t o s c r a t c h i n g , a b Assignment 2007-MECH-104 Page 6
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r a s i o n , o r c u t t i n g . I t i s t h e p r o p e r t y Assignment 2007-MECH-104 Page 7
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o f a m e t a l , w h i c h g i v e s i t t h e a b i l i t Assignment 2007-MECH-104 Page 8
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y t o r e s i s t b e i n g p e r m a n e n t l y , d e f o r m e Assignment 2007-MECH-104 Page 9
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d ( b e n t , b r o k e n , o r h a v e i t s s h a p e c h a Assignment 2007-MECH-104 Page 10
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n g e d ) , w h e n a l o a d i s a p p l i e d . T h e g r e Assignment 2007-MECH-104 Page 11
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a t e r t h e h a r d n e s s o f t h e m e t a l , t h e g r Assignment 2007-MECH-104 Page 12
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e a t e r r e s i s t a n c e i t h a s t o d e f o r m a t i o n Assignment 2007-MECH-104 Page 13
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Types of hardness : There are three main types of hardness measurements: scratch, indentation, and rebound. Within each of these classes of measurement there are individual measurement scales. For practical reasons conversion tables are used to convert between one scale and another. 1. Scratch hardness Scratch hardness is the measure of how resistant a sample is to fracture or plastic (permanent) deformation due to friction from a sharp object. The principle is that an object made of a hard material will scratch an object made of a softer material. 2. Indentation hardness Indentation hardness measures the resistance of a sample to permanent plastic deformation due to a constant compression load from a sharp object. The tests work on the basic premise of measuring the critical dimensions of an indentation left by a specifically dimensioned and loaded indenter. 3. Rebound hardness Rebound hardness, also known as dynamic hardness, measures the height of the "bounce" of a diamond-tipped hammer dropped from a fixed height onto a material. This type of hardness is related to elasticity . The device used to take this measurement is known as a scleroscope . HARDNESS MEASUREMENT Hardness measurement can be defined as macro-, micro- or nano- scale according to the forces applied and displacements obtained. 1.Macro-hardness Measurement of the macro-hardness of materials is a quick and simple method of obtaining mechanical property data for the bulk material from a small sample. It is also widely used for the quality control of surface treatments processes. However, when concerned with coatings and surface properties of importance to friction and wear processes for instance, the macro-indentation depth would be too large relative to the surface-scale features. Assignment
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mm lab 104 - MECHANICS OF MATERIALMANUAL ASSIGNMENT...

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