Strength Of Materials Pdf Book Download

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Strength of Materials

About Mechanical Library Our goal is to provide all the required Mechanical Engineering materials for free to anyone in the world, because no one owns education, it is equal right to everyone and no one should suffer the lack of books. Powered by Blogger. Mechanics of Materials by R. Mechanics of materials is a branch of mechanics that studies the internal effects of stress and strain in a solid body that is subjected to an external loading.

Stress is associated with the strength of the material from which the body is made, while strain is a measure of the deformation of the body. A thorough understanding of the fundamentals of this subject is of vital importance because many of the formulas and rules of design cited in engineering codes are based upon the principles of this subject.

Historical Development : The origin of mechanics of materials dates back to the beginning of the seventeenth century, when Galileo performed experiments to study the effects of loads on rods and beams made of various materials. Over the years, after many of the fundamental problems of mechanics of materials had been solved, it became necessary to use advanced.

As a result, this subject expanded into other areas of mechanics, such as the theory of elasticity and the theory of plasticity. Research in these fields is ongoing, in order to meet the demands for solving more advanced problems in engineering. Since statics has an important role in both the development and application of mechanics of materials, it is very important to have a good grasp of its fundamentals. For this reason we will review some of the main principles of statics that will be used throughout the text.

External Loads. A body is subjected to only two types of external loads; namely, surface forces or body forces. In all cases these forces are distributed over the area of contact between the bodies. If this area is small in comparison with the total surface area of the body, then the surface force can be idealized as a single concentrated force, which is applied to a point on the body.

For example, the force of the ground on the wheels of a bicycle can be considered as a concentrated force. If the surface loading is applied along a narrow strip of area, the loading can be idealized as a linear distributed load, w s. The resultant force of w s is equivalent to the area under the distributed loading curve, and this resultant acts through the centroid C or geometric center of this area.

The loading along the length of a beam is a typical example of where this idealization is often applied. Body Forces : A body force is developed when one body exerts a force on another body without direct physical contact between the bodies.

Although body forces affect each of the particles composing the body, these forces are normally represented by a single concentrated force acting on the body. Support Reactions. The surface forces that develop at the supports or points of contact between bodies are called reactions.

For two dimensional. Note carefully the symbol used to represent each support and the type of reactions it exerts on its contacting member. As a general rule, if the support prevents translation in a given direction, then a force must be developed on the member in that direction. Likewise, if rotation is prevented, a couple moment must be exerted on the member. For example, the roller support only prevents translation perpendicular or normal to the surface.

Hence, the roller exerts a normal force F on the member at its point of contact. Since the member can freely rotate about the roller, a couple moment cannot be developed on the member. Mechanics of materials is a study of the relationship between the external loads applied to a body and the stress and strain caused by the internal loads within the body.

External forces can be applied to a body as distributed or concentrated surface loadings, or as body forces that act throughout the volume of the body. Linear distributed loadings produce a resultant force having a magnitude equal to the area under the load diagram, and having a location that passes through the centroid of this area.

A support produces a force in a particular direction on its attached member if it prevents translation of the member in that direction, and it produces a couple moment on the member if it prevents rotation. The equations of equilibrium and must be satisfied in order to prevent a body from translating with accelerated motion and from rotating.

When applying the equations of equilibrium, it is important to first draw the free-body diagram for the body in order to account for all the terms in the equations. The method of sections is used to determine the internal resultant loadings acting on the surface of the sectioned body. In general, these resultants consist of a normal force, shear force, torsional moment, and bending moment. The resultant internal loadings at a point located on the section of a body can be obtained using the method of sections.

This requires the following steps. Support Reactions : First decide which segment of the body is to be considered. If the segment has a support or connection to another body, then before the body is sectioned, it will be necessary to determine the reactions acting on the chosen segment.

To do this draw the freebody diagram of the entire body and then apply the necessary equations of equilibrium to obtain these reactions. Free-Body Diagram : Keep all external distributed loadings, couple moments, torques, and forces in their exact locations, before passing an imaginary section through the body at the point where the resultant internal loadings are to be determined.

These resultants are normally placed at the point representing the geometric center or centroid of the sectioned area. If the member is subjected to a coplanar system of forces, only N, V, and M act at the centroid. Establish the x, y, z coordinate axes with origin at the centroid and show the resultant internal loadings acting along the axes. Equations of Equilibrium. Moments should be summed at the section, about each of the coordinate axes where the resultants act. Doing this eliminates the unknown forces N and V and allows a direct solution for M and T.

If the solution of the equilibrium equations yields a negative value for a resultant, the assumed directional sense of the resultant is opposite to that shown on the free-body diagram.

Deformation :. These changes are referred to as deformation, and they may be either highly visible or practically unnoticeable. For example, a rubber band will undergo a very large deformation when stretched, whereas only slight deformations of structural members occur when a building is occupied by people walking about.

Deformation of a body can also occur when the temperature of the body is changed. A typical example is the thermal expansion or contraction of a roof caused by the weather. In a general sense, the deformation of a body will not be uniform throughout its volume, and so the change in geometry of any line segment within the body may vary substantially along its length. Hence, to study deformational changes in a more uniform manner, we will consider line segments that are very short and located in the neighborhood of a point.

Realize, however, that these changes will also depend on the orientation of the line segment at the point. For example, a line segment may elongate if it is oriented in one direction, whereas it may contract if it is oriented in another direction. Strain is actually measured by experiments, and once the strain is obtained, it will be shown in the next chapter how it can be related to the stress acting within the body. We have also shown that the mathematical relationship between stress and strain depends on the type of material from which the body is made.

Torsional Deformation of a Circular Shaft : Torque is a moment that tends to twist a member about its longitudinal axis. Its effect is of primary concern in the design of axles or drive shafts used in vehicles and machinery.

We can illustrate physically what happens when a torque is applied to a circular shaft by considering the shaft to be made of a highly deformable material such as rubber.

When the torque is applied, the circles and longitudinal grid lines originally marked on the shaft tend to distort into the pattern shown in. Note that twisting causes the circles to remain circles, and each longitudinal grid line deforms into a helix that intersects the circles at equal angles.

Also, the cross sections from the ends along the shaft will remain flat—that is, they do not warp or bulge in or out—and. From these observations we can assume that if the angle of twist is small, the length of the shaft and its radius will remain unchanged.

Angle of Twist : Occasionally the design of a shaft depends on restricting the amount of rotation or twist that may occur when the shaft is subjected to a torque. Furthermore, being able to compute the angle of twist for a shaft is important when analyzing the reactions on statically indeterminate shafts. Critical Load : Whenever a member is designed, it is necessary that it satisfy specific strength, deflection, and stability requirements. Some members, however, may be subjected to compressive loadings, and if these members are long and slender the loading may be large enough to cause the member to deflect laterally or sidesway.

To be specific, long slender members subjected to an axial compressive force are called columns, and the lateral deflection that occurs is called buckling. Quite often the buckling of a column can lead to a sudden and dramatic failure of a structure or mechanism, and as a result, special attention must be given to the design of columns so that they can safely support their intended loadings without buckling. Dynamic Fracture Mechanics by Arun Shukla. Fundamentals of Metallurgy by Seshadri Seetharaman.

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Basic and Applied Thermodynamics by P.

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These books are used by students of top universities, institutes and colleges. The complete theory began with the consideration of the behavior of one and two dimensional members of structures, whose states of stress can be approximated as two dimensional, and was then generalized to three dimensions to develop a more complete theory of the elastic and plastic behavior of materials. The study of strength of materials often refers to various methods of calculating the stresses and strains in structural members, such as beams, columns, and shafts. The reason is the electronic devices divert your attention and also cause strains while reading eBooks. List of Books Collected. EasyEngineering team try to Helping the students and others who cannot afford buying books is our aim.

When a system comprises two or more members of different materials, the forces in various members cannot be determined by the principle of statics alone. Such systems are known as statically indeterminate systems. In such systems, additional equations are required to supplement the equations of statics to determine the unknown forces. Usually, these equations are obtained from deformation conditions of the system and are known as compatibility equations. A compound bar is a case of an indeterminate system.


Strength of Materials PDF Free Download. Published Date: Author Name: S. S. Rattan. The strength of materials, is also called mechanics of.


Strength Of Material By R K Bansal

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Strength of Materials E book pdf by R.K.Rajput

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The complete theory began with the consideration of the behavior of one and two dimensional members of structures, whose states of stress can be approximated as two dimensional, and was then generalized to three dimensions to develop a more complete theory of the elastic and plastic behavior of materials. The study of strength of materials often refers to various methods of calculating the stresses and strains in structural members, such as beams, columns, and shafts. Download engineering mathematics by KA stroud. Download fluid mechanics by Rajput.

About Mechanical Library Our goal is to provide all the required Mechanical Engineering materials for free to anyone in the world, because no one owns education, it is equal right to everyone and no one should suffer the lack of books. Powered by Blogger. Mechanics of Materials by R. Mechanics of materials is a branch of mechanics that studies the internal effects of stress and strain in a solid body that is subjected to an external loading. Stress is associated with the strength of the material from which the body is made, while strain is a measure of the deformation of the body. A thorough understanding of the fundamentals of this subject is of vital importance because many of the formulas and rules of design cited in engineering codes are based upon the principles of this subject.


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