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# 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 plate is stressed to a maximum of 20 MPa in tension.

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