Effect of High Strain Rate on strength of Metal

In summary, the main reason for changing the strength of metals under very high strain rate is to resist deformation or fracture. While all metals show a similar trend in increased strength under high strain rate, the effect of crystal structure on this phenomenon must also be considered. When designing structures for high strain rate situations, the criteria and purpose must be taken into account, such as whether the goal is to resist deformation or have a desirable fracture or disintegration. To resist failure, the material should have high strength, fracture toughness, and ductility, and the ability to achieve a maximum strain energy density.
  • #1
jbond
3
0
What is the main reason for changing the strength of metals under very high strain rate? Do all metals show the similar trend in increased strength under high strain rate? What is the effect of crystal structure on this phenomenon?:!)
 
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  • #2
One also asked elsewhere:
I want to know the effect of crystal structure of metals on the strength properties under high strain rate.

What should be the design philosophy for designing structures which is supposed to go under high strain rate? i.e. which strength should be taken for consideration.

All good questions. It all depends on to what criteria or purpose one is designing the structure or object, i.e. is the goal to resistant deformation/fracture under high strain rate, or fracture or disintegration is desirable. These two goals refer to armour (resistant) or armour-piercing.

To resist failure, the material needs high strength (high YS and UTS), high fracture toughness, and high ductility, and the ability to achieve a maximum strain energy density (SED), which is basically the integral under stress-strain curve (maximum energy absorption without or before failure).
 
  • #3
Astronuc said:
One also asked elsewhere:


All good questions. It all depends on to what criteria or purpose one is designing the structure or object, i.e. is the goal to resistant deformation/fracture under high strain rate, or fracture or disintegration is desirable. These two goals refer to armour (resistant) or armour-piercing.

To resist failure, the material needs high strength (high YS and UTS), high fracture toughness, and high ductility, and the ability to achieve a maximum strain energy density (SED), which is basically the integral under stress-strain curve (maximum energy absorption without or before failure).

Thanks for reply.
 

What is high strain rate?

High strain rate refers to the rate at which a material experiences stress or deformation. It is typically measured in units of strain per second.

How does high strain rate affect the strength of metal?

High strain rate can significantly affect the strength of metal by causing it to deform and fail more easily. This is due to the increased energy and force applied to the metal at a faster rate, leading to changes in its microstructure and properties.

What factors influence the effect of high strain rate on metal strength?

The effect of high strain rate on metal strength can be influenced by various factors such as temperature, strain rate, and material composition. Different metals may also respond differently to high strain rate conditions.

How is the effect of high strain rate on metal strength measured?

The effect of high strain rate on metal strength is typically measured using specialized equipment such as a split Hopkinson pressure bar or a high-speed tensile testing machine. These instruments can apply high strain rates to a metal sample and measure its response.

What are some potential applications of studying the effect of high strain rate on metal strength?

Studying the effect of high strain rate on metal strength is important for understanding the behavior of materials in high-speed impact and loading scenarios. This knowledge can be applied in fields such as aerospace, defense, and automotive industries, where materials are subject to extreme forces and need to maintain their strength and integrity.

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