## Articles Posted in the " Strengths of Materials " Category

• ### THIN SHELLS CLASS NOTES FOR MECHANICAL ENGINEERING

THIN CYLINDRICAL SHELL CLASS NOTES FOR MECHANICAL ENGINEERING A vessel is a thin if its thickness is less as compared to its diameter. Mathematically it is expressed as a thin shell if D/t.  A vessel is a thin shell where stresses are assumed to be uniform. Uniform stresses mean stress at the inner to […]

• ### STRESSSES IN THICK CYLINDER CLASS NOTES FOR MECHANICAL ENGINEERING

STRESSES IN THICK CYLINDER   CLASS NOTES FOR MECHANICAL ENGINEERING  Stresses are uniform in thin shells.  Stress at the inner radius is equal to the stress at the outer radius. There is no variation of hoop, longitudinal and radial stresses. However, when pressure is high, thin walled vessels are no longer useable. Use a thick […]

• ### LAME’S EQUATIONS THICK CYLINDER CLASS NOTES FOR MECHANICAL ENGINEERING

LAME’S EQUATIONS  THICK CYLINDER CLASS NOTES FOR MECHANICAL ENGINEERING These equations deal with the hoop and radial stresses variation in a thick cylinder. Various cases considered are thick cylinder subjected to fluid pressure only internal/external or internal and external. Lame’s equation determine the maximum stresses and their location in the thick cylinder.   Lame’s Equations […]

• ### MIDDLE THIRD & MIDDLE QUARTER RULE CLASS NOTES

MIDDLE THIRD & MIDDLE QUARTER RULE CLASS NOTES It is applicable when bending is combined with axial loading.  Eccentric loading also cause bending and axial loading combined. In such cases, maximum  and minimum stresses will co-exist in the outermost fibers. Maximum stress σmax = M/Z + P/A= Maximum compressive Minimum stress σmin = M/Z – […]

• ### MOMENT OF INERTIA & POLAR MOMENT OF INERTIA CLASS NOTES

MOMENT OF INERTIA & POLAR MOMENT OF INERTIA CLASS NOTES Moment of inertia is for a cross section. Larger value reduces bending. Polar moment of inertia is about the centroid axis. Larger value reduces torsional twist. Definition of Moment of Inertia It is a property of a cross-sectional area to resist bending. Larger is the […]

• ### SIMPLE STRESSES MULTIPLE CHOICE QUESTIONS (MCQ) WITH ANSWERS

SIMPLE STRESSES MULTIPLE CHOICE QUESTIONS (MCQ) WITH ANSWERS  MCQ on simple stresses is very helpful. It helps in understanding fully about strength of materials. Stress is internal resistance against external loading. It has a limited value for a material. Limited value is different for different materials. Fig. Simple tensile & compressive stresses  Magnitude of […]

• ### LAMINATED SPRINGS CLASS NOTES FOR MECHANICAL ENGINEERING

LAMINATED SPRINGS CLASS   NOTES FOR MECHANICAL ENGINEERING   This type of spring is very common in use. There is an advantage over the coiled spring. It acts as a structural member. In addition it absorbs a shock. Used in cars, trucks, buses and trains. This type of spring has number of plates of constant […]

• ### FLAT SPIRAL SPRING CLASS NOTES FOR MECHANICAL ENGINEERING

FLAT SPIRAL SPRING CLASS NOTES FOR MECHANICAL ENGINEERING This spring is an important part in almost every machinery. These springs perform different functions in different applications. These absorb shocks in vehicles running on uneven roads. These store energy in toys and circuit breakers. These give cushion effect in sofas and cars. Springs are of […]

• ### OPEN COILED HELICAL SPRING CLASS NOTES FOR ENGINEERING

OPEN COILED HELICAL SPRING CLASS NOTES FOR ENGINEERING Spring is a very useful item. Open coiled helical spring finds use in many applications. It absorbs shock and store energy. It has significant deformation within elastic limits. Use spring steel for its manufacture.   OPEN COILED HELICAL SPRING UNDER AXIAL LOAD Spring will be under […]

• ### CLOSE COILED HELICAL SPRINGS CLASS NOTES FOR MECHANICAL ENGINEERING

CLOSE COILED HELICAL SPRINGS CLASS NOTES FOR MECHANICAL ENGINEERING Spring is an important part in almost every machinery. These springs perform different functions in different applications. These absorb shocks in vehicles running on uneven roads. These store energy in toys and circuit breakers. These give cushion effect in sofas and cars. Springs are of different […]