1. Glass and epoxy have stiffnesses of Eglass = 70 GPa and Eepoxy = 3.5 GPa and fracture toughnessvalues of Kic-glass = KIC-epoxy = 1 MPa√m.a. Which has a higher toughness (GC)?b. What might the broken surfaces look like after failure, and how does that relate to the energydissipated during fracture?

a.To determine which material, glass or epoxy, has higher toughness, we need to consider both…

Answered: 1. Glass and epoxy have stiffnesses of…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

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Estimate the theoretical fracture strength of a brittle material if it is known that fracture occurs by the propagation of an elliptically shaped surface crack of length 0.5 mm and having a tip radius of curvature of 5(10-3) mm, when a stress of 1035 MPa is applied.
3. Linear elastic fracture mechanics (LEFM) predicts there will be an infinite stress at the tip of a crack. Why is this not the case? What happens microstructurally in metals, polymers and ceramics that prevents this?
Why do the Brittle materials fail in tension?
A cylindrical metal specimen having an original diameter of 10.07 mm and gauge length of 46.0 mm is pulled in tension until fracture occurs. The diameter at the point of fracture is 7.17 mm, and the fractured gauge length is 68.9 mm. Calculate the ductility in terms of (a) percent reduction in area (percent RA), and (b) percent elongation (percent EL).
A fracture surface of a metal matrix composite (nickel with silicon carbide fibres) is investigated with a Scanning Electron Microscope (SEM). Questions: a. Which signals can you use to make an image of the sample? b. Which signal do you prefer to observe the fracture surface? c. How can you discriminate between the matrix and the fibres? d. How can you increase the magnification to observe a detail with the SEM?
V. The following picture shows Charpy fracture surfaces of a material with different initial temperatures, after testing. Which of these figures, i.e., (a) to (e), is related to the lowest temperature? Explain. (b) (d)
A very wide plate with a 2" long center crack is heated in order to be brazed to its end supports. The plate is made of a material with Elastic modulus of 15x10$psi and a = 6x10-º in/in/°F. Considering the brazed ends become rigid supports at 400°F and assuming that the material has a constant Fracture Toughness of 30ksivlin, at what temperature will the plate fracture? [hint: use B (geometric factor) =1.0 for this geometry]
Material Science please help
5. A cylindrical sample has a gauge length of 50.80 mm and original diameter of 12.8 mm. The sample is pulled with a high load that led to fracture. At the point of fracture, the diameter is 6.60 mm, and the fractured gauge length is 72.14 mm. Calculate the: (a) Ductility in term of percent elongation. (b) Ductility in term of percent reduction in area.
QUESTION 1 Select from the following statements, those which describe the process and conditions required for brittle fracture. (Note: Partial credit is not available for this question. Credit will only be awarded if all correct answers, and no incorrect answers, are selected). A. Occurs along defined crystallographic planes, thus leaving smooth fracture surfaces B. Occurs due to repeated loading and unloading below the yield strength of the material OC. Occurs in materials where the bonding strength is high relative to the yield strength D. The stress concentration at the crack tip exceeds the inter-atomic bonding energy ☐ E. Involves the nucleation, growth and coalescence of voids, thus resulting in rough fracture surfaces OF. Is a slow process whereby there is warning prior to failure
19 Consider a cylindrical specimen of some hypo- thetical metal alloy that has a diameter of 10.0 mm (0.39 in.). A tensile force of 1500 N (340 lb;) produces an elastic reduction in diameter of 6.7 x 104 mm (2.64 × 10 in.). Compute the elastic modulus of this alloy, given that Poisson's ratio is 0.35.
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