The solid mechanics as a subject may be defined as a branch of applied mechanics that deals with behaviors of solid bodies subjected to various types of loadings. This is usually subdivided into further two streams i.e. Mechanics of rigid bodies or simply Mechanics and Mechanics of deformable solids. The mechanics of deformable solids which is branch of applied mechanics is known by several names i.e. strength of materials, mechanics of materials etc.
Basic concept of Mechanics of Materials::
Decision making comes in every stage of design. Consider two cars of different makes. They may both be reasonable cars and serve the same purpose but the designs are different. The designers consider different factors and come to certain conclusions leading to an optimum design. Market survey gives an indication of what people want. Existing norms play an important role. Once a critical decision is made, the rest of the design features follow.
Mechanics of rigid bodies:
The mechanics of rigid bodies is primarily concerned with the static and dynamic behavior under external forces of engineering components and systems which are treated as infinitely strong and undeformable. Primarily we deal here with the forces and motions associated with particles and rigid bodies.
Mechanics of deformable solids:
The mechanics of deformable solids is more concerned with the internal forces and associated changes in the geometry of the components involved. Of particular importance are the properties of the materials used, the strength of which will determine whether the components fail by breaking in service, and the stiffness of which will determine whether the amount of deformation they suffer is acceptable. Therefore, the subject of mechanics of materials or strength of materials is central to the whole activity of engineering design. Usually the objectives in analysis here will be the determination of the stresses, strains, and deflections produced by loads. Theoretical analyses and experimental results have an equal role in this field.
Aim of Strength of Materials:
Aim of subject is to derive expressions for stress, strain and deformation under different loading conditions by using experimentally obtained elastic properties like E (Young’s Modulus) and u (Poisson’s ratio). Ultimate aim of design is to develop a drawing or a plan i.e. selection of appropriate shape, selection of appropriate material (calculation of dimensions by using strength of materials equations), selection of manufacturing process details in such a way that the resulting machine component should perform its functionality satisfactory.
Assumptions made while deriving Strength of Materials:
Topics to be taught under Strength of Materials:
· Mechanics of Materials, Gere Timoshenko.
· NPTEL, Mechanical, Strength of Materials.
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