SOM ASSIGNMENT Simple stresses and simple strains Determine the diameter of a short rod to carry a compressive load of 2800 N, such that the percentage contraction and compressive stress do not exceed 0.01 and 30 N/mm2 . Given E = 200 GN/m2. Find decrease in length if the original length is 10 cm. Find the […]
SOM: FORMULAS FOR SIMPLE STRESSES AND SIMPLE STRAINS Quantity Equation Units Nature Tensile stress, at σt=Ft/A N/mm2 + Tensile strain, εt εt =dl/l No units + Tensile modulus, E E = σt /εt GN/m2 Comp. stress, σc σc=Fc /A N/mm2 — Comp. strain, εc εc= –dl/l No units — Comp. modulus, E E = σc […]
S O M MECHANICAL ENGINEERING — INTERVIEW SHORT QUESTION ANSWERS ON STRENGTH OF MATERIALS — Section modulus, relation between Young’s modulus and modulus of rigidity, 0.2 % proof stress, perpendicular axis theorem, Differentiate between a shaft and a beam Q What is section modulus? It is the ratio of moment of inertia to the maximum distance of outermost […]
Multiple Choice Questions (mcq) on Strength of Materials –Stresses and strains in composite sections Stresses in a composite section of two materials will be (a) Load in one material/area of that material (b) Load in second material/area of first material (c) Load in one material/area of second material (d) None (Ans: a) Strains in a composite […]
Multiple Choice Questions (mcq) on Strength of Materials–Stresses, strains and stress strain curves Nature of shear stress is (a) Positive (b) Negative (c) Positive as well as negative (d) None (Ans: c) Shear stress causes (a) Deformation (b)Elongation (c) Contraction (d) None (Ans: d) Shear stress causes (a) Deformation (b) Distortion (c) Displacement (d) […]
S O M– shaft, beam, BENDING STRESSES AND SIMPLE STRESSES, Middle Quarter Rule and Middle Third Rule For Eccentric Loading Q Difference between a shaft and a beam. Shaft is a rotating member and is generally circular. It is always under a torque. In addition it may have bending moment and axial thrust. It is […]
S O M– Short Interview Question Answers on Introduction to Strength of Materials, Stress, Types of Stresses, Tensile Stress, Compressive Stress, Shear Stress and Thermal Stress Introduction to Strength of Materials This subject tells which materials are strong in tension/compression/bending/torsion/buckling loads. Hence depending upon the application, one can select the material for that application. Application includes […]
TYPES OF MODULUS, Young’s Modulus, Shear Modulus, Bulk Modulus, Relation between Elastic Constants, Simple Strain, Types of strains and Units of Strains These are of three types. It is the ratio of stress to strain. Young’s modulus = E = tensile stress/ tensile strain Young’s modulus = E = compressive stress/ compressive strain Shear modulus = G […]
SIMPLE STRESSES Stress: It is the internal resistance of a material against the external force applied. Mathematically stress = force/area =N/mm2. Simple stress is due to only one type of load applied. Simple tensile stress when only tensile load is applied. Tensile load is perpendicular to the area and coming out of the area (like […]
BENDING STRESSES & STRAINS IN COMPOSITE BEAMS DEFINITION OF A COMPOSITE BEAM A beam of two or more materials is a composite beam. STRESSES AND STRAINS IN COMPOSITE BEAMS Derivation of bending equation assumes the material is homogeneous and isotropic. A composite beam cannot satisfy this assumption. Therefore, a composite beam is converted into a […]