Direct measurement of straindependent solid surface stress. Stress and strain describe the force in objects undergoing. The area under the force extension graph work done area under the stress strain graph energy per unit volume fe. Deformation of solids deformation engineering young.
Elastic properties of solids university of toronto. Tensile, compressive and shear deformation of simple and compound bars under axial load thermal stress elastic constants strain energy and unit strain energy strain energy in uniaxial loads. When an object has a large value of elastic modulus, the effect of stress is small. For example, stress on a rubber band produces a larger strain as compared to a steel band of the same size. The magnitude of the resisting force is numerically equal to the applied force.
Likewise, a small elastic modulus means that stress produces noticeable deformation. Page 1 ce1259 strength of materials unit i stress, strain deformation of solids rigid and deformable bodies strength, stiffness and stability stresses. A change in the shape of an object due to the application of force is known as deformation. Unit i stress, strain deformation of solids strength of. Deformation of solids deformation engineering strength of. When the stress is sufficient to permanently deform the metal, it is called plastic deformation. Here authors measure the solid surface stress of a gel, and show its dependence on surface strain through a surface modulus.
Stress, strain and deformation in solids deformation mechanics. Pdf an overview of stressstrain analysis for elasticity equations. If the expansion of a structural member is constrained, it will cause stresses to develop which are known as thermal stress. The ratio of stress and strain is constant with in the elastic limit. Deformation of solids free download as powerpoint presentation. Deformation of solids it is possible to change the shape or size or both of an object through the application of external forces it is described as strain. Describe the types of elastic deformation of objects and. Stress is the external force acting on the object per unit area. Alevel physicsforces and motiondeformation of solids. The negative ratio of lateral strain to the longitudinal strain is known as poissons ratio. The proportionality constant in this relation is known as the elastic modulus. Stress is the quantity that is proportional to the external force causing the deformation.
Stress when an external force acts on a body, it undergoes deformation. En380 naval materials science and engineering course notes, u. Stress, strain and deformation in solids free download as word doc. The relation between stress and strain is given as follows. Stressstrain curves are an extremely important graphical measure of a materials mechanical. The elastic modulus is also the slope of the curve. Explain the concepts of stress and strain in describing elastic deformations of materials. Pdf the present chapter contains the analysis of stress, analysis of strain.
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