<Li> Tensile strength or ultimate tensile strength is a limit state of tensile stress that leads to tensile failure in the manner of ductile failure (yield as the first stage of that failure, some hardening in the second stage and breakage after a possible "neck" formation) or brittle failure (sudden breaking in two or more pieces at a low stress state). Tensile strength can be quoted as either true stress or engineering stress, but engineering stress is the most commonly used . </Li> <Li> Fatigue strength is a measure of the strength of a material or a component under cyclic loading, and is usually more difficult to assess than the static strength measures . Fatigue strength is quoted as stress amplitude or stress range (Δ σ = σ m a x − σ m i n (\ displaystyle \ Delta \ sigma = \ sigma _ (\ mathrm (max)) - \ sigma _ (\ mathrm (min)))), usually at zero mean stress, along with the number of cycles to failure under that condition of stress . </Li> <Ul> <Li> Impact strength is the capability of the material to withstand a suddenly applied load and is expressed in terms of energy . Often measured with the Izod impact strength test or Charpy impact test, both of which measure the impact energy required to fracture a sample . Volume, modulus of elasticity, distribution of forces, and yield strength affect the impact strength of a material . In order for a material or object to have a high impact strength the stresses must be distributed evenly throughout the object . It also must have a large volume with a low modulus of elasticity and a high material yield strength . </Li> </Ul> <Li> Impact strength is the capability of the material to withstand a suddenly applied load and is expressed in terms of energy . Often measured with the Izod impact strength test or Charpy impact test, both of which measure the impact energy required to fracture a sample . Volume, modulus of elasticity, distribution of forces, and yield strength affect the impact strength of a material . In order for a material or object to have a high impact strength the stresses must be distributed evenly throughout the object . It also must have a large volume with a low modulus of elasticity and a high material yield strength . </Li>

Impact strength of material is an index of its
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