MCQ ON COMBINED BENDING AND AXIAL LOADS The maximum stress under bending and axial loading will be (a) σb + σa (b) σb – σa (c) σb + σb (d) None ANS(a) The minimum stress under bending and axial loading will be (a) σb + σa (b) σb – σa (c) σb + σb […]
MCQ ON SHEAR STRESSES IN BEAMS Shear stress variation in a beam is (a) Linear (b) Curvilinear (c) Logarithmic (d) None ANS: (d) Shear stress variation in a beam is (a) Linear (b) Curvilinear (c) Parabolic (d) None ANS: (c) Average shear stress in a beam is (Shear force is ‘V’) (a) V/Z (b) V/A […]
INTRODUCTION TO STRENGTH OF MATERIALS —- SHEET 3—THERMAL STRESSES, THERMAL STRAINS, POISSON’S RATIO, ELASTIC CONSTANTS, FACTOR OF SAFETY Thermal stress (σth) is there only when contraction due to fall of temperature is restricted——It is a tensile stress.=EαΔt Thermal stress (σth) is there only when expansion due to rise of temperature is restricted——- It is […]
INTRODUCTION TO STRENGTH OF MATERIALS–SHEET ———–Types of strains, modulus, stresses in composite sections, stresses due to suddenly and impact loads TYPES OF STRAINS : six Tensile strain, compressive strain, shear strain, linear strain, lateral strain and volumetric strain. Symbol for tensile strain =Є (epsilon) = δL/L = + in nature Symbol for compressive strain […]
Introduction to Strength of Materials—-SHEET 1–Various types of loads, Simple stresses 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 chair, table, rod, shaft or any item one can think of. The selection is possible after performing tests […]
STRENGTH OF MATERIALS—-CASTIGLIANO’S TWO THEOREMS, MEANING OF GENERALIZED DISPLACEMENTS, STRAIN ENERGY RELATIONS FOR DIFFERENT LOADS, PROCEDURE FOR APPLICATION OF CASTIGLIANO’S THEOREM, NUMERICAL EXAMPLE ON CASTIGLIANO’S THEOREM Castigliano’s Method This method deals with displacements with respect to strain energy (Strain energy is also called potential energy, also called Internal energy). It is really the strain energy […]
Fatigue Mechanical Life Design-A Review—–PRACTICAL APPLICATIONS OF FATIGUE FAILURES, STEPS TO REDUCE FATIGUE, PRINCIPAL CONSIDERATIONS IN DESIGN AGAINST FATIGUE,CONCLUSIONS AND REFERENCES—–Page 4—Keywords: Fatigue, endurance limit, discontinuity, fatigue life, cyclic loading and unloading, residual stresses, surface finish, reversal of stresses. PRACTICAL APPLICATIONS OF FATIGUE FAILURES Shafts, buckets, disks and blades of jet engines Crank shafts […]
Fatigue Mechanical Life Design-A Review—-FACTORS AFFECTING ENDURANCE LIMIT, CAUSES OF FATIGUE FAILURES, DIFFERENT PHASES IN FATIGUE—-Page 3 —-Keywords: Fatigue, endurance limit, discontinuity, fatigue life, cyclic loading and unloading, residual stresses, surface finish, reversal of stresses. References are on Page 4 FACTORS AFFECTING ENDURANCE LIMIT Endurance limit ‘σe’ depends on the following factors: Surface factor, […]
Fatigue Mechanical Life Design-A Review, NOTABLE FATIGUE FAILURES, FATIGUE MECHANICAL LIFE and LOADS CAUSING FATIGUE—–Page 2 —-Keywords: Fatigue, endurance limit, discontinuity, fatigue life, cyclic loading and unloading, residual stresses, surface finish, reversal of stresses—–References Page-4 NOTABLE FATIGUE FAILURES 1. Versailles train disaster 2. The 1862Hartley Colliery Disaster 3. De Havilland Comet […]
Fatigue Mechanical Life Design-A Review, ABSTRACT AND INTRODUCTION——Page 1, Keywords: Fatigue, endurance limit, discontinuity, fatigue life, cyclic loading and unloading, residual stresses, surface finish, reversal of stresses.—References are on Page 4. Fatigue Mechanical Life Design-A Review Abstract— Fatigue is due to cyclic loading and unloading of one kind or the other. It is due […]