buckling load. It is obtained b y dividing the buckling load by a suitable factor o f safety (F.O.S). Safe load = Buckling load /Factor of safety 3. State Hooke’s law. It states that when the material is loaded, within its elastic limit, the stress is directly proportional to the strain. Stress Strain α 4. Define Factor of Safety. It is defined as the ratio of ultimate tensile stress to the permissible stress(working stress). 5. State the tensile stress & tensile strain. When a member is subjected to equal & opposite axial pulls the length of the member is increased. The stress is included at any cross section of the member is called Tensile stress & the corresponding strain is known as Tensile strain. EXPERIMENT NO.-3 TITLE: - Impact test AIM: - To determine the Impact toughness (strain energy) through Izod test and Charpy test In a impact test a specially prepared notched specimen is fractured by a single blow from a THEORY: - hammer and energy required being a measure of resistance to impact. Impact load is produced by a swinging of an impact weight W (hammer) from a height h. Release of the weight from the height h swings the weight through the arc of a circle, which strikes the specimen to fracture at the notch (fig.. Kinetic energy of the hammer at the time of impact is mv2 /2, is equal to the relative potential energy of the hammer before its release. (M gh), where m is the mass of the hammer and is its tangential velocity
buckling load. It is obtained b y dividing the buckling load by a suitable factor o f safety (F.O.S). Safe load = Buckling load /Factor of safety 3. State Hooke’s law. It states that when the material is loaded, within its elastic limit, the stress is directly proportional to the strain. Stress α Strain 4. Define Factor of Safety. It is defined as the ratio of ultimate tensile stress to the permissible stress(working stress). 5. State the tensile stress & tensile strain. When a member is subjected to equal & opposite axial pulls the length of the member is increased. The stress is included at any cross section of the member is called Tensile stress & the corresponding strain is known as Tensile strain. EXPERIMENT NO.-3 TITLE: - Impact test AIM: - To determine the Impact toughness (strain energy) through Izod test and Charpy test THEORY: - In a impact test a specially prepared notched specimen is fractured by a single blow from a hammer and energy required being a measure of resistance to impact. Impact load is produced by a swinging of an impact weight W (hammer) from a height h. Release of the weight from the height h swings the weight through the arc of a circle, which strikes the specimen to fracture at the notch (fig.. Kinetic energy of the hammer at the time of impact is mv2 /2, is equal to the relative potential energy of the hammer before its release. (M gh), where m is the mass of the hammer and is its tangential velocity
som-AKS.docx