MECHANICS OF SOLIDS I 2019 Plotting of Graph Draw graph between Load and

Mechanics of solids i 2019 plotting of graph draw

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MECHANICS OF SOLIDS-I 2019 Plotting of Graph: Draw graph between Load and Deflection and get [P’/D] value from the graph that is the slope of the straight line. PRECAUTIONS: Specimen should be clean Note the Dimension of specimen and Marking Apply load gradually Read the breaking load carefully Reading should be noted carefully Keep distance from machine when test is performing COMMENTS: 67
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MECHANICS OF SOLIDS-I 2019 EXPERIMENT NO. 08 “TO PERFORM HARDNESS TEST ON A GIVEN STEEL SAMPLE USING BRINELL HARDNESS TESTING MACHINE. ASTM E-10” Purpose: To check hardness of sample To check quality of sample in industry It gives indirect measure of strength of material Apparatus: Brinell Hardness testing Machine Steel ball indenters Steel sample 68
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MECHANICS OF SOLIDS-I 2019 Related Theory: Hardness: It is property of material by the virtue of which it resists the plastic deformation, usually by penetration .However; the term hardness may also refer to resistance to bending, scratching, abrasion or cutting. Methods of Measuring Hardness: a) Brinell hardness testing b) Vicker’s hardness testing c) Rockwell hardness testing Brinell hardness testing: BS (240-1961): In this method a hardened steel bar is pressed into the surface under a specified load for a fixed time and then released. Hardness which is calculated as a number termed as the ratio of applied in Kg to the indenter contact area in mm. B.H.N=Load applied on indenter (Kg)/Contact area of indenter (mm) B.H.N = D D 2 d 2 π 2 D ¿ P ¿ 69
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MECHANICS OF SOLIDS-I 2019 Where, D=Diameter of indenter d= Indentation diameter Applications: Because of the wide test force range the Brinell test can be used on almost any metallic material. The part size is only limited by the testing instrument's capacity. Indenters: For soft material 10 mm steel ball indenter For hard material 10 mm carbide indenter Load 3000 kg force for hard material 500 Kg or 1500 Kg for soft material Time 10 to 15 seconds for iron and steel 30 seconds for all other materials Observations and Calculations: Sr.NO. Specimen Ball Dia. (mm) Dia. of indentation(d) mm Mean Dia.(d) (mm) Load (Kg) B.H.N d1 d2 d3 1 Copper 10 2 Aluminum 10 3 Brass 10 70
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MECHANICS OF SOLIDS-I 2019 Load applied on indenter (Kg) =P D=diameter of indenter d= indentation diameter PRECAUTIONS: Specimen should be clean. Note the Dimension of specimen and Marking. Apply load gradually. Read the Peak load carefully. Reading and Time should be noted carefully. Keep distance from machine when test is performing. COMMENTS: 71
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MECHANICS OF SOLIDS-I 2019 EXPERIMENT NO. 09 “TO STUDY COLUMN BUCKLING FOR DIFFERENT END- CONDITIONS.” Objective: To find out critical buckling loads To check applicability of Euler’s Theory To study various end-conditions of column Apparatus: Column buckling apparatus Vernier calipers 72
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MECHANICS OF SOLIDS-I 2019 73
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MECHANICS OF SOLIDS-I 2019 Loads Related Theory: Column: A bar or a member of a structure inclined at 90° to the horizontal and carrying an axial compressive load is called a column.
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  • Winter '17
  • salman ahmed

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