Articles Posted in the " Introduction to SOM " Category

  • STRENGTH OF MATERIALS-2

    STRENGTH OF MATERIALS-2

    STRENGTH OF MATERIALS-2 TYPES OF MODULUS These are of three types. Young’s modulus = E =  tensile stress/ tensile strain Young’s modulus = E =  compressive stress/ compressive strain Shear modulus    = G =  shear stress/ shear strain Bulk modulus = K =Volumetric stress/ volumetric strain= pressure/volumetric strain= p/ (δV/ V) Units of each modulus […]


  • Strength of Materials-1

    Strength of Materials-1

    Strength of Materials-1 This subject tells which materials are strong in tension/compression/bending/torsion/buckling loads. Hence depending upon the application, one can select the material for that application. Application includes chair, table, rod, shaft or any item one can think of. The selection is possible after performing tests under various kinds of forces/moments/torques etc. Tests help to […]


  • Mechanical Properties-2

    Mechanical Properties-2

    Mechanical Properties- 2 Brittleness A brittle material shows no deformation under any type of load. However, if the load is increased, it will fail suddenly. Normally these materials fail due to small impact (moving) force. It has only one strength i.e. Ultimate strength. Brittle materials are cast iron, stone, brick etc. Malleability Under this property, […]


  • MECHANICAL PROPERTIES- 1

    MECHANICAL PROPERTIES- 1

    MECHANICAL PROPERTIES-1  Materials/machines/structures are subjected to forces of one kind or the other or combined forces. How the materials behave under these forces is explained in terms of mechanical properties. These mechanical properties are measured by various destructive tests. Various worth mentioning mechanical properties are Ductility, Elasticity, Resilience, Yield strength. Stiffness, Toughness, Brittleness, Creep, Fatigue, […]


  • Mcq: Gradually, suddenly and impact loads

    Mcq: Gradually, suddenly and impact loads

    Mcq: Gradually, suddenly and impact loads A gradually applied load is one (a) Which is increased 2 times every time (b) Which is increased in equal installments (c) Which is increased in any proportions (d) None (Ans: b) A suddenly applied load is one (a) Which is applied in two installments (b) Which is applied in […]


  • Mcq: Forces- 1

    Mcq: Forces- 1

    Mcq: Forces- 1 Tensile force is one which increases the dimension in its own direction and is (a) Parallel to the area of cross section (b) Normal to area of cross section (c) Neither normal nor parallel to the cross section (d) None (Ans: b) Tensile force is normal to the cross section and its vector […]


  • Short Interview Question Answers on different loads

    Short Interview Question Answers on different loads

      Short Interview Question Answers on different loads 21. What are various types of forces? Two types of forces: Constant magnitude and variable magnitude. Examples of Constant magnitude forces: Weight force acting vertically downwards Examples of variable magnitude forces: Pressure force, Wind force, Inertia force, Centrifugal force, Thermal force, Seismic force, Frictional force, Snow load […]


  •  Gradually- Suddenly  – Impact Loads

     Gradually- Suddenly  – Impact Loads

     Gradually- Suddenly  – Impact Loads Gradually Applied Load When a load is applied in installments i.e. load of 100 N to be applied. First a load of 5 N then 10 N, 15 N 20 N —————–100 N is applied. Overall it causes less stress and less strain as compared to suddenly applied load. Mostly […]


  •  Elastic Constants and Simple Strains

     Elastic Constants and Simple Strains

     Elastic Constants and Simple Strains Poisson’s Ratio and Modulus are elastic constants. These constants have constant value for various materials. These are applicable only within elastic limits. Therefore, these are called elastic constants. Modulus Ratio of stress to strain is called modulus. These are of three types. (i)  Young’s modulus (Tension) = E =  tensile stress/ tensile […]


  • FAILURE OF DUCTILE AND BRITTLE MATERIALS

    FAILURE OF DUCTILE AND BRITTLE MATERIALS

    FAILURE OF DUCTILE AND BRITTLE MATERIALS Failure of Ductile Materials A ductile material is usually considered to have failed when it suffers an elastic failure. Elastic failure of ductile materials is not a physical failure i.e. components does not meet a breakdown. (i)Mild steel under a tensile load fails by pure sheari.e.at 450 to the […]