The discussion focuses on the effect of high strain rate on the strength of metals, emphasizing that different metals exhibit varying responses to increased strain rates. Key factors influencing this phenomenon include crystal structure, yield strength (YS), ultimate tensile strength (UTS), fracture toughness, and ductility. The design philosophy for structures subjected to high strain rates must prioritize either resistance to deformation or intentional fracture, depending on the intended application, such as armor versus armor-piercing materials.
PREREQUISITESMaterials scientists, structural engineers, and designers involved in creating high-performance materials and structures for applications subjected to high strain rates.
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.
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).