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MECHANICAL PROPERTIES OF MATERIALS Some important mechanical properties are: (i)         Strength (in tension, compression, shear, bending and torsion) (ii)       Elasticity                           (iii)       Plasticity (iv)       Ductility                        (v)         Brittleness  (vi)       Malleability               (vii)      Impact strength (viii)     Fatigue                               (ix)       Creep (x)       Hardness.                    ...

 MATERIALS Mild steel, tor steel, cast iron, brass, aluminium, copper, concrete, bricks, tiles, stone, timber, glass, etc. are some commonly used materials for engineering purposes. The important properties of materials are mechanical, thermal, magnetic, electrical, chemical, physical, etc. From this subject point of view, here we shall discuss only mechanical properties of materials. Before going into the details of these properties, it is necessary to understand the classification of materials. CLASSIFICATION OF MATERIALS The materials generally used for structural purposes, machine parts or electronic devices can be classified as (i) elastic, (ii) plastic, (iii) ductile and (iv) brittle. (i) Elastic Material:- A material is said to be perfectly elastic when the deformation produced under the action of external loads vanishes completely on the removal of the load. (ii) Plastic Material:- If a material does not regain its original size and shape on the removal of the load an...

  LOADS External forces and moments (or couples) acting on a body are called loads. Dead loads, live loads, wind loads, impact loads, seismic loads, snow loads are some of the loads to be considered in the design of a structure. EFFECTS OF LOAD ON A MEMBER 1. It may pull the member on which it acts to produce the tensile stress and tensile strain.(Refer Fig. 1.1). In this case, a member is said to be under tension. A member under tension is called a tie member. 2. It may push the member on which it acts to produce the compressive stress and compressive p strain. (Refer Fig. 1.2). In this case, a member is said to be under compression. A member under compression is called as column or strut. 3. It may shear the member on which it acts to produce the shear stress and shear strain. (Refer Fig. 1.3). Pins, rivets and bolts are known as shear members. 4. It may bend the member on which it acts to produce the bending stress and strain. (Refer Fig. 1.4). A beam is a bending memb...

  Q. What is Engineering Machanics ? Answer :-  It is mechanics of rigid body. ​ If the relative position of the particles doesn't change even in the presence of external forces. then it is rigid body. ​ Study of external force & their effects. MOS ​ It is mechanics of deformable bodies. ​ Here deals with the study of internal resistive forces. ​ Deformable bodies. ​Change in dimension/shape change. ​Resistance that has a tendency to oppose the change. ​ The basic objects of strength of materials to drive the expression for stresses, strans, deformation that are developed due to the external force, these are used in designing a component. Strength :- ​ Ability of a material to resist failure against external forces. ​ The maximum stress that can be developed just before Failure is called strength. ​ It is material property and is const for a given material. ​ It is primary design parameter. Stiffness :- ​Ability of a material to resist deformation. ​material property. ​sec...