What is elastomers explain it with stress-strain curve?

Elastomers – definition An elastomer is a polymer with the property of elasticity. In other words, it is a polymer that deforms under stress and returns to its original shape when the stress is removed. Elastomers, which melt when heated, are classified as thermoplastic.

How is stress-strain defined?

Stress is defined as the force experienced by the object which causes a change in the object while a strain is defined as the change in the shape of an object when stress is applied.

What type of elastic stress-strain Behaviour is shown by rubber?

Right Answer is: B Modulus of elasticity or Young’s modulus is the slope of the stress-strain curve in the elastic region. For rubber, it can be seen that the elastic stress-strain behaviour is non-linear.

What is stress-strain called?

Strain under a tensile stress is called tensile strain, strain under bulk stress is called bulk strain (or volume strain), and that caused by shear stress is called shear strain.

What are elastomers give an example?

Elastomers are loosely cross-linked polymers. Examples of elastomers include natural rubbers, styrene-butadiene block copolymers, polyisoprene, polybutadiene, ethylene propylene rubber, ethylene propylene diene rubber, silicone elastomers, fluoroelastomers, polyurethane elastomers, and nitrile rubbers.

What you mean by elastomers?

Elastomeric refers to the rubber-like properties of a polymer, i.e., a material being able to regain its original shape when a load is removed from the material. Materials possessing elastomeric properties include both natural and synthetic rubber, urethane, polyurea and polymeric coatings.

What are the types of strain?

Just like stress, there are two types of strain that a structure can experience: 1. Normal Strain and 2. Shear Strain. When a force acts perpendicular (or “normal”) to the surface of an object, it exerts a normal stress.

What is stress relaxation materials?

Stress relaxation is a decreased tendency for the material to return to its original shape when unloaded. Over time, the stress and force decrease, while the strain remains constant. It is important to note the part does not change shape during stress relaxation.

What are the types of elastomers?

Four common elastomers are cis-polyisoprene (natural rubber, NR), cis-polybutadiene (butadiene rubber, BR), styrene-butadiene rubber (SBR), and ethylene-propylene monomer (EPM).

Why is rubber called elastomers?

They change their shape on applying force and regain their original shape on removal of the applied force . Hence , rubbers are called elastomers.

What is the stress strain of a polymeric elastomer?

Stress-Strain Behavior of Polymeric Elastomers A polymeric elastomer is defined by the American Society for Testing and Materials (ASTM) as “a material that, at room temperature, can be stretched repeatedly to at least twice its original length, and, upon immediate release of the stretch, will return with force to its approximate original length”.

What is the relationship between stress and strain?

Stress And Strain 1 Introduction to Stress and Strain. You may have noticed that certain objects can stretch easily, but stretching objects like an iron rod sounds impossible, right? 2 Stress-Strain Curve. The stress-strain relationship for materials is given by the material’s stress-strain curve. 3 Hooke’s Law.

Which is an example of a stress strain curve?

1.1 Stress-Strain Curves 1.2 Definition and Classes 1 1.1 Stress-Strain Curves Elastomers Plastics Fibers Modulus (psi) 15 – 150 1,500 – 200,000 150,000 – 1,500,000 Percent Elongation 100 – 1000 20 – 100 < 10 Crystallinity Low Moderate High Polymer example Natural rubber Polyethylene Nylon 1.2 Definition and Classes Plastic (thermoplastic)

How is the modulus of elasticity related to the strain?

E ⇒ Modulus of Elasticity – Slope of the initial linear portion of the stress-strain diagram. The modulus of elasticity may also be characterized as the “stiffness” or ability of a material to resist deformation within the linear range. E (Steel) ≈ 30 x 106 psi E (Aluminum) ≈ 10 x 106 psi E