What is engineering stress strain curve?
In engineering and materials science, a stress–strain curve for a material gives the relationship between stress and strain. It is obtained by gradually applying load to a test coupon and measuring the deformation, from which the stress and strain can be determined (see tensile testing).
What is the breaking stress of brittle materials?
Breaking stress is a limit state of tensile stress that leads to tensile failure in one of two manners: Ductile failure – Some yield as the first stage of failure, some hardening in the second stage and breakage after a possible “neck” formation.
How do you know if material is brittle?
A material is brittle if, when subjected to stress, it breaks with little elastic deformation and without significant plastic deformation. Brittle materials absorb relatively little energy prior to fracture, even those of high strength. Breaking is often accompanied by a snapping sound.
Is rubber a brittle material?
Rubber is not ductile. Ductility is the ability of a material to undergo permanent deformation through elongation or bending without fracturing. However, rubber has a ‘shelf life’ of between 3 and 5 years depending on how it is stored. Rubber becomes brittle as it ages.
Why does rubber become brittle?
Rubber bands become brittle with age due not so much because of oxidation but rather due to evaporation of volatiles in the rubber/plastic material. These volatiles are parts of the plastic/rubber material that keep them soft and flexible, and the loss of them cause them to become stiff and break.
What material is most elastic?
rubber
Why steel is most elastic?
So, it can be said that for a given amount of stress, the strain produced in the steel is comparatively smaller than the strain produced in the rubber. Therefore, with the help of Young’s modulus, it can be concluded that steel has greater elasticity than rubber.
Which is more elastic rubber or steel prove mathematically?
Answer. Elasticity is measured on a stress-strain diagram. that means the same stress causes plastic deformations in the rubber sample while the steel sample returns to the no-stress configuration. That’s how steel can be more elastic than rubber.
Which is more elastic steel or plastic?
Answer. By definition steel is more elastic than plastic because it regain its original shape faster than rubber after removal of deforming force.
Which material is least elastic?
Answer. Rubber has the lest elasticity. This question can be answered based on the property Elastic Limit. Elastic Limit is the most extreme burden a given material would withstand with no perpetual twisting.
Which is more elastic steel or Aluminium?
Steel is more elastic as Young modulus of elasticity less than Alumnium. So Aluminium exhibits more stiffness comparing to steel and it is brittle too. One can easily observe this property from aluminum foils used in house hold use seldom reusable as it can not return back to its orginal plain shape.
Is copper more elastic than rubber?
Therefore, the rubber is more elastic than glass and glass is more elastic than copper and copper is more elastic than steel. The increasing order of Coefficient of elasticity will be Rubber The correct option is Option D. Note:We might think that rubber is more elastic so it can have a large coefficient of elasticity.
Which is more elastic water or air and why?
Water is more elastic than the air because we know that the bulk modulus of elasticity is reciprocal of compressibility. So the answer is water is more elastic than air because it is less compressible than the air.
Which is more elastic water or Crystal?
Water is more elastic than air because bulk modulus of elasticity is reciprocal of compressibility and air is more compressible than water.
Why are springs made of steel and not of copper?
Solution : A spring will be better one, if a large restoring force is setup in it on being deformed, which in turm depends upon the elasticity of the material of the spring. Since the Young’s modulus of elastivity of steel is more than that of copper. Hence steel is prefferred in making the spring.
Is lead more elastic than rubber?
Reason: if the same load is attached to lead and rubber wires of the same cross-sectional area, the strain of lead is very much less than that of rubber. Hence, lead is elastic than rubber.
Is breaking stress a material property?
Breaking stress is an intrinsic property of a material. A material breaks when both the ‘stress on it’ and ‘strain in it’ increases (in fact both are related by the modulus of elasticity).
What does the slope of stress versus strain graph indicate?
The slope of the stress-strain curve in the elastic deformation region is the modulus of elasticity, which is known as Young’s modulus. It represents the stiffness of the material-resistance to elastic strain. The description of Hooke’s law can also be found from the slope.
Which of the following affects the elasticity of a substance?
The elasticity of a substance is affected by Impurity of substance, Hammering and annealing, Change in temperature.
Which of the following has highest elasticity?
Steel substances
What is meant by elasticity of a substance?
Elasticity, ability of a deformed material body to return to its original shape and size when the forces causing the deformation are removed. A body with this ability is said to behave (or respond) elastically.
What is the effect of annealing on elasticity of materials answer?
Annealing: Annealing is done by heating and then cooling the materials slowly. This results in a decrease in the elasticity of the material. Temperature: As the temperature increases, intermolecular forces decreases, resulting in a decrease in the elasticity.
What is the effect of annealing?
The annealing treatment increases the system’s strength by reducing dislocation emission sources and improves material ductility through strengthening grain boundaries’ resistance to intergranular cracks.
Why is annealing important?
This heat treatment process increases a metal’s ductility and ensures that metal forming and shaping are more efficient processes. As a process, annealing is necessary because materials tend to lose ductility while gaining yield strength after a certain amount of cold working.
What are the factors on which modulus of elasticity depends?
Solution : The modulus of elasticity depends upon (i) nature of material and (ii) type of stress used in producing the strain.