Finding the maximum stress & the strain that exists under a maximum-stress?

The femur is a bone in the leg whose minimum cross-sectional area is about 3.3 x 10–4 m2. A compressional force in excess of 6.2 x 104 N will fracture this bone. Bone has a compressional Young's modulus of 9.4 x 109 N/m2. (a) Find the maximum stress that this bone can withstand. (b) What is the strain that exists under a maximum-stress condition?

Answer:
if you have the stress and young's modulus you can find strain...stress = young's modulus * strain so
strain = stress / young's modulus

Strain is Stress/Young's modulus

Stress=6.2*10E4/3.3E-4 N/m^2;
Strain=Stress/9.4E9 (no units m/m)

Sometimes strain is given in microstrain, just multipley what you get by 10^6.

lFemur is the longest bone between the hip and knee joint. It may have to be treated as short column with both ends hinged to caculate allowable compressive stress . It is necssary to know length and slenderness ratio for above purpose . Only If l/r is less than 30, then it may be treated as compression member and allowable stress / strain decided by your way.
Many death originates from femur breakage at old age wfhich becomes brittle with time ,

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Finding the maximum stress & the strain that exists under a maximum-stress?

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