You can think of Young's Modulus as the elastic stress when the strain is 1 (i.e. the length of the object has doubled). Not many materials can double in length and remain perfectly elastic, so the UTS of most materials is numerically less than E.nasu said:So it seems that there is a general tendency to have UTS "less" than E, in value.
Young's modulus, also known as the modulus of elasticity, is a measure of the stiffness of a material. It is defined as the ratio of stress (force per unit area) to strain (change in length per unit length) in the elastic region of the material. It is represented by the symbol E and is typically measured in units of gigapascals (GPa) or pounds per square inch (psi).
Ultimate tensile strength (UTS) is the maximum stress that a material can withstand before it breaks or fails. It is an important measure of a material's strength and is typically measured in units of megapascals (MPa) or pounds per square inch (psi).
The main difference between Young's modulus and ultimate tensile strength is that Young's modulus measures the stiffness or elasticity of a material, while ultimate tensile strength measures the maximum stress a material can withstand before breaking. Young's modulus is a measure of the material's response to stress, whereas ultimate tensile strength is a measure of its maximum strength.
Young's modulus and ultimate tensile strength are both measures of a material's strength, but they are not directly related. A material with a higher Young's modulus will generally be stiffer and less likely to deform under a given amount of stress, but it may not necessarily have a higher ultimate tensile strength. Likewise, a material with a higher ultimate tensile strength may not necessarily have a higher Young's modulus.
Knowing the Young's modulus and ultimate tensile strength of a material is important for understanding its mechanical properties and determining its suitability for various applications. For example, a material with a high Young's modulus may be more suitable for structural applications, while a material with a high ultimate tensile strength may be more suitable for applications that require resistance to high stresses or loads.