Piano strings are made of a fibre which is pulled taut. When the string is tapped in the centre by a striker the resonance produces a musical note. The bending of the string causes a strain of up to 0.2% and a stress of up to 100 MPa. Based on the function and requirements of a piano string and the properties listed (E = tensile modulus, oy = yield stress, &f = failure strain, p = density), which of the following materials would you choose? O a. polypropylene (E = 1.5GPa, oy = 40MPa, &f = 100%, p = 0.9 g/cm³) O b. aluminium (E = 70GPa, oy = 40MPa, &ƒ = 50%, p = 2.7 g/cm³) polyethylene (E = 1GPa, oy = 20MPa, &f=200%, p = 0.9g/cm³) O c. O d. steel (E = 210GPa, σy = 680MPa, &f = 5%, p = 7.8 g/cm³) e. silica glass (E = 94GPa, oy =7,000 MPa, &f = 0.1%, p = 2.6 g/cm³)

Piano strings are made of a fibre which is pulled taut. When the string is tapped in the centre by a striker the resonance produces a musical note. The bending of the string causes a strain of up to 0.2% and a stress of up to 100 MPa. Based on the function and requirements of a piano string and the properties listed (E = tensile modulus, oy = yield stress, &f = failure strain, p = density), which of the following materials would you choose? O a. polypropylene (E = 1.5GPa, oy = 40MPa, &f = 100%, p = 0.9 g/cm³) O b. aluminium (E = 70GPa, oy = 40MPa, &ƒ = 50%, p = 2.7 g/cm³) polyethylene (E = 1GPa, oy = 20MPa, &f=200%, p = 0.9g/cm³) O c. O d. steel (E = 210GPa, σy = 680MPa, &f = 5%, p = 7.8 g/cm³) e. silica glass (E = 94GPa, oy =7,000 MPa, &f = 0.1%, p = 2.6 g/cm³)

Materials Science And Engineering Properties

1st Edition

ISBN:9781111988609

Author:Charles Gilmore

Publisher:Charles Gilmore

Chapter12: Composite Materials

Section: Chapter Questions

Problem 20CQ

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