21. However, it is limited because the calculated elastic modulus will decrease as more data points are used along the unloading curve. 22. In a real material, the stiffness of the springs is called the elastic modulus , and the mass corresponds to the density. 23. Since the late 1970s, further types of carbon fiber yarn entered the global market, offering higher tensile strength and higher elastic modulus . 24. Other method of decreasing roll deflection include increasing the elastic modulus of the roll material and adding back-up supports to the rolls. 25. It has been shown experimentally that the elastic modulus ( E ) of a polymer is influenced by the load and the response time. 26. A " perfectly rigid " body should have an infinite elastic modulus , because it never has any strain, regardless of its stress. 27. E is the elastic modulus and I is the second moment of area, the product of these giving the stiffness of the beam. 28. One such material with high promise is PEEK, which exhibits an order of magnitude greater toughness with similar elastic modulus and tensile strength. 29. Is there an elastic modulus that's normalized to material stiffness ? talk ) 18 : 09, 19 December 2011 ( UTC) 30. Because a high degree of stretch is desirable in this application, a material with a low elastic modulus is preferred, such as nylon.
