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Lab Manuals for Strength Of Materials - SOM By ANNA SUPERKINGS

  • Strength Of Materials - SOM
  • Practical
  • Mechanical Engineering
  • Uploaded 11 months ago
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ii CE6315 STRENGTH OF MATERIALS LABORATORY LTPC 0032 OBJECTIVES To supplement the theoretical knowledge gained in Mechanics of Solids with practical testing for determining the strength of materials under externally applied loads. This would enable the student to have a clear understanding of the design for strength and stiffness. LIST OF EXPERIMENTS 1. Tension test on a mild steel rod 2. Double shear test on Mild steel and Aluminium rods 3. Torsion test on mild steel rod 4. Impact test on metal specimen 5. Hardness test on metals - Brinnell and Rockwell Hardness Number 6. Deflection test on beams 7. Compression test on helical springs 8. Strain Measurement using Rosette strain gauge 9. Effect of hardening- Improvement in hardness and impact resistance of steels. 10. Tempering- Improvement Mechanical properties Comparison i) Unhardened specimen (ii) Quenched Specimen and (iii) Quenched and tempered specimen. 11. Microscopic Examination of (i) Hardened samples and (ii) Hardened and tempered samples. TOTAL: 45 PERIODS OUTCOMES: • Ability to perform different destructive testing • Ability to characteristic material LIST OF EQUIPMENT FOR BATCH OF 30 STUDENTS S.No. 1 2 3 4 5 6 7 8 NAME OF THE EQUIPMENT Universal Tensile Testing machine with double 1 shear attachment – 40 Ton Capacity Torsion Testing Machine (60 NM Capacity) Impact Testing Machine (300 J Capacity) Brinell Hardness Testing Machine Rockwell Hardness Testing Machine Spring Testing Machine for tensile and compressive loads (2500 N) Metallurgical Microscopes Muffle Furnace (800 C) Qty. 1 1 1 1 1 1 3 1

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iii INDEX st I Cycle Experiments: 1. Tension Test on mild steel rod. 2. Torsion test on mild steel rod. 3. Impact test on metal specimen 4. Compression test on helical springs 5. Hardness test on metals (a) Brinnell Hardness number (b) Rockwell Hardness number nd II Cycle Experiments: 6. 7. 8. 9. Deflection test on beams Double shear test on mild steel and aluminium rods Effect on Hardening- Improvement in Hardness and impact resistance of steels. Tempering- Improvement Mechanical properties comparison (a) Unhardened specimen (b) Quenched specimen (c) Quenched and tempered specimen 10. Microscopic Examination of (a) Hardened samples (b) Hardened and tempered samples. SRM Group VEC Dept. of Mechanical Engineering

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iv A LIST OF BASIC SAFETY RULES 1. When you handle chemicals wear eye protection (chemical splash goggles or full face shield). 2. When you work with furnaces for heat treatment procedures or other thermally activated equipment you should use special gloves to protect your hands. 3. Students should wear durable clothing that covers the arms, legs, torso and feet. (Note: sandals, shorts, tank tops etc. have no place in the lab. Students inappropriately dressed for lab, at the instructors discretion, be denied access) 4. To protect clothing from chemical damage or other dirt, wear a lab apron or lab coat. Long hair should be tied back to keep it from coming into contact with lab chemicals or flames. 5. In case of injury (cut, burn, fire etc.) notify the instructor immediately. 6. In case of a fire or imminently dangerous situation, notify everyone who may be affected immediately; be sure the lab instructor is also notified. 7. If chemicals splash into someone's eyes act quickly and get them into the eye wash station, do not wait for the instructor. 8. In case of a serious cut, stop blood flow using direct pressure using a clean towel, notify the lab instructor immediately. 9. Eating, drinking and smoking are prohibited in the laboratory at all times. 10. Never work in the laboratory without proper supervision by an instructor. 11. Never carry out unauthorized experiments. Come to the laboratory prepared. If you are unsure about what to do, please ask the instructor. 12. Always remember that HOT metal or ceramic pieces look exactly the same as COLD pieces are careful what you touch. 13. Know the location and operation of : Fire Alarm Boxes Exit Doors Telephones SRM Group VEC Dept. of Mechanical Engineering

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v LABARATORY CLASSES - INSTRUCTIONS TO STUDENTS 1. Students must attend the lab classes with ID cards and in the prescribed uniform. 2. Boys-shirts tucked in and wearing closed leather shoes. Girls students with cut shoes, overcoat, and plait incite the coat. Girls students should not wear loose garments. 3. Students must check if the components, instruments and machinery are in working condition before setting up the experiment. 4. Power supply to the experimental set up/ equipment/ machine must be switched on only after the faculty checks and gives approval for doing the experiment. Students must start to the experiment. Students must start doing the experiments only after getting permissions from the faculty. 5. Any damage to any of the equipment/instrument/machine caused due to carelessness, the cost will be fully recovered from the individual (or) group of students. 6. Students may contact the lab in charge immediately for any unexpected incidents and emergency. 7. The apparatus used for the experiments must be cleaned and returned to the technicians, safely without any damage. 8. Make sure, while leaving the lab after the stipulated time, that all the power connections are switched off. 9. EVALUATIONS: All students should go through the lab manual for the experiment to be carried out for that day and come fully prepared to complete the experiment within the prescribed periods. Student should complete the lab record work within the prescribed periods. Students must be fully aware of the core competencies to be gained by doing experiment/exercise/programs. Students should complete the lab record work within the prescribed periods. The following aspects will be assessed during every exercise, in every lab class and marks will be awarded accordingly: Preparedness, conducting experiment, observation, calculation, results, record presentation, basic understanding and answering for viva questions. In case of repetition/redo, 25% of marks to be reduced for the respective component. SRM Group VEC Dept. of Mechanical Engineering

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