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Why the engineering stress-strain curve in shear is the same as the true stress-strain curve?

The engineering stress-strain curve in shear is the same as the true stress-strain curve because, in shear, the definitions of stress and strain do not change significantly with the material's deformation. True stress accounts for the instantaneous area under load, while engineering stress uses the original area; however, in shear, the relationship remains linear up to the yield point, and the area reduction effect is minimal for typical shear tests. Thus, both curves reflect the same material behavior in shear deformation, leading to equivalent representations.


What are the uses of steel rod reinforcement?

Concrete's best strength rating is in compression, as in equal force from either side. Its weakest rating is in its shear strength, as in force in different areas like snapping a pencil in your hands. To increase concretes shear strength, re-inforcing steel bar is used because of its high shear strength characteristics.


Why modulus of rigidity is not considered in shear test?

The modulus of rigidity, or shear modulus, is not typically considered in shear tests because these tests primarily focus on determining the material's shear strength and behavior under shear loading. Shear tests, such as the torsion test or direct shear test, measure how materials deform and fail under shear stresses, rather than quantifying their elastic properties. While the shear modulus can be derived from the initial linear portion of the stress-strain curve in some tests, the main objective is to evaluate the material's performance and failure characteristics under shear conditions.


What is the ratio of average shear stress to maximum shear stress for a circular section?

the average shear stress is 3/4 the maximum shear stress for a circular section


Is it correct to say shear tensile strength or tensile shear strength?

The correct term is "shear tensile strength." This term refers to the material's ability to withstand shear stresses before failure, particularly in situations where tensile forces are also acting. "Tensile shear strength" is less commonly used and may cause confusion, as it implies a different relationship between tensile and shear stresses.