2034hw7 - MSE2034 HW#7 Due Thursday, March 17 Maximum Score...

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MSE2034 HW#7 Due Thursday, March 17 Maximum Score = 12/10 (1 pt each, except 2 pts for Problems 8 & 9) 1) Consider a typical sample of window glass with elastic modulus of 69 GPa. If the most severe flaws in this sample are internal cracks with a total length of 0.2 mm and tip radius of curvature of 0.001 mm, would a 250 MPa tensile stress be sufficient to shatter the sample? HINT: Use elastic modulus to calculate the ideal strength of the material. 2) Refer to Table 8.1 for data on the titanium alloy known as “Ti-6Al-4V”, which is used for high-performance aircraft components. If a small plate of this material is loaded to a stress equal to 1/2 the yield strength, what would be the maximum allowable length of (a) and internal crack for which Y=1.5, and (b) an edge crack for which Y=1.6? 3) Consider a large thick plate of polycarbonate with yield strength of 62.1 MPa, plain-strain fracture toughness of 2.2 MPa m, and surface cracks 0.05 mm in length (these are very small in comparison to the dimensions of the plate). The
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2034hw7 - MSE2034 HW#7 Due Thursday, March 17 Maximum Score...

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