The difference of bulk and young modulus

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SUMMARY

The discussion clarifies the distinct definitions and applications of bulk modulus and Young's modulus in material science. Young's modulus (E) measures tensile stress over tensile strain, while bulk modulus (K) quantifies the pressure needed for a specific volume change. The relationship between the two is expressed as E=3(1-2ν)K, where ν represents Poisson's ratio. These moduli are approximately equal when ν is around 0.33, a value typical for metals but not applicable to ceramics or elastomers.

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  • Understanding of material properties and stress-strain relationships
  • Familiarity with Poisson's ratio and its significance
  • Basic knowledge of tensile and bulk stress concepts
  • Experience with mechanical properties of metals, ceramics, and elastomers
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  • Research the calculation and implications of Poisson's ratio in material science
  • Study the applications of Young's modulus in structural engineering
  • Explore the significance of bulk modulus in fluid mechanics
  • Investigate the differences in mechanical properties between metals, ceramics, and elastomers
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Material scientists, mechanical engineers, and students studying the mechanical properties of materials will benefit from this discussion.

saray1360
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Hi everyone,

I want to know what the difference between bulk modulus and young modulus is? In some papers, it seems that they have compared the value of these two as if they are the same.

Could anyone help me with this regard?

Regards,
Sara
 
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Youngs modulus refers to stretching and bulk modulus refers to compressing.
 
it is not the answer, sorry
 
Youngs modulus and bulk modulus are different..The former is tensile stress/tensile strain the latter is bulk stress/bulk strain.
 
Dadface said:
Youngs modulus and bulk modulus are different..The former is tensile stress/tensile strain the latter is bulk stress/bulk strain.

The bulk modulus K is the amount of pressure required to obtain a certain change in volume per unit volume. The Young's modulus is E=3(1-2\nu)K (*). For a rod (long, thin geometry), it is the amount of axial stress (compression or tension) required to obtain a certain change in axial length per unit length. They are approximately equal when \nu is near 0.33, which is common for metals (but not for ceramics or elastomers).

(*) \nu is Poisson's ratio, the ratio of the lateral contraction over the axial contraction for a rod under axial load.

EDIT: Removed unnecessary comment.
 
Last edited:

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