Strength Of Materials: Engr. John Lester L. Morillo Bs Che / Adamson University

STRENGTH OF MATERIALS

ENGR. ENGR. JOHN JOHN LESTER LESTER L. MORILLO MORILLO BS CHE / ADAMSON ADAMSON UNIVERSITY UNIV ERSITY

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SIMPLE STRESS Simple stress is stress is the force per unit area.

P A Where: P = force A = cross-sectional area ζ = stress









SIMPLE STRESS Shearing stress ( stress ( or Tangential stress ) stress ) is a stress caused by forces acting along or parallel to the area resisting the forces. Bearing stress is stress is one which is caused by forces acting perpendicular to the area resisting the forces. Normal stresses, like tensile stress and compressive stress are stress are examples of bearing stress.









SIMPLE STRAIN Simple strain is strain is the ration of deformation or elongation to the original length.

L Where: ε = strain δ = elongation









HOOKE’s LAW Hooke’s Law states

that within elastic limit the stress is proportional to strain, thus:

P A

E L









STRESS - STRAIN DIAGRAM











Elastic limit refers limit refers to the stress beyond which the material mate rial will not return to its original when the load is removed. The permanent deformation caused by excessive stress is called permanent set











Working stress is the actual stress of the material when loaded. Allowable stress is stress is the maximum safe stress which the











STRESSES IN THIN WALLED STRESSES CYLINDERS AND SPHERES FOR CYLINDERS: A. Tangential Tangential Stress:











STRESSES IN THIN WALLED STRESSES CYLINDERS AND SPHERES Where: p = pressure D = inside diameter.











TORSION Torsion refers Torsion refers to the twisting of solid or hollow circular shafts. A. Shearing stress where: T

torque applied













TORSION













TORSION

























HELICAL SPRINGS













HELICAL SPRINGS





















































































Strength Of Materials: Engr. John Lester L. Morillo Bs Che / Adamson University

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