Week 3 Pre-class

Which material/metal is the stiffest based on the following data provided and why?

In the tensile test experiment, one of the following is correct regarding the final fracture: Select one: O The fracture occurs in the middle of the specimen and is inclined with 45°. O The fracture occurs anywhere in the smallest cross sectional-area of the specimen and is perpendicular to the direction of the load applied. O Fracture occurs randomly and we can never predict the shape of it O The fracture occurs anywhere in the smallest cross sectional-area of the specimen and is inclined with 45°.

Mark the following points on an Engineering Stress-Strain curve. Plastic limitElastic limitFracture strengthYield strengthUltimate tensile strength

1. For the stress-strain curve shown below, please estimate the properties indicated. (a) Fracture Strain Please do your work on a separate sheet of paper, and put your answers in the boxes on the right. Be sure to include the proper symbol and units. Stress Strain 70 60 50 Stress (ksi) 240 30 20 10 70 0 0.000 60 50 Stress (ksi) 40 20 10 KULL 0 0.000 0.010 0.050 0.100 Strain (in/in) Stress Strain 0.020 0.030 Strain (in/in) 0.040 0.150 0.050 (b) Ultimate Tensile Stress (c) Fracture Stress (d) Proportional Limit (e) Elastic Modulus (1) Yield Stress (g) Tensile Toughness (Modulus of Toughness) (h) Modulus of Resilience

A tensile test generates the stress-strain diagram shown here. 600 Stress (MPa) 500 400 300 200 100 T 1 T 0 0.00 Stress (MPa) 0.04 500 400 300 200 100 0.000 0.08 Young's modulus numeric value equal to Young's modulus value obtain from 0.002 0.004 Yield strength numeric value equal to Yield strength value obtain from Tensile strength numeric value equal to Tensile strength value obtain from Strain Strain Assume a tensile specimen was originally 10 cm long with 2 cm x 2 cm square shape cross section. 0.12 1 0.006 0.16 0.20 The change in sample length while a stress of 480 MPa is applied to a tensile specimen [Choose ] [Choose ] [Choose ] [Choose ] [Choose ] [Choose ] [Choose ]

would you please describe this picture for me i have to present it to audience please to be more value? and what i have to say?

Based upon the information in the table below, which material is the stiffest? Elastic Strain at Fracture Fracture Yield Strength (MPa) Tensile Modulus Strength (MPa) 120 550 340 Fractures before yielding 850 Strength (MPa) 105 500 265 650 720 Material 100 415 310 0.40 0.15 0.23 (GPa) 150 310 210 350 210 700 0.14 OE OB A. OD

True stress (MPa) 8-7 Figure 8-21 is a plot of true stress versus true strain for a metal. For total imposed strains of 0.1, 0.2, 0.3 and 0.4, determine the elastic and plastic components of the strain. The modulus of elasticity of the metal is 100 GPa. 600 500 400 300 200 100 0.1 0.2 0.3 0.4 0.5 True strain Figure 8-21 A true stress versus true strain curve for a metal (for Problem 8-7).

What is unit of shear strain?

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

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Stuck need help! Problem is attached. please view attachment before answering.  Really struggling with this concept. Please show all work so I can better understand ! Thank you so much.

What is compressive principal stress?

Name the 7 different points on a stress-strain diagram?

If fracture load was 0.212 kN, what is the Fracture bending stress for a material having a width of "t" 50 mm and a thickness "w" of 5 mm and a support span "L" of 200 mm?

Material Science please help

I just can't find The percent elongation at fracture.

According to Griffith's theory for brittle fracture, the stress required to propagate a crack is: (This question has more than one correct answer) 0.5 a. Proportional to a' where 2a is the crack length b. More than the ideal fracture stress -0.5 c. Proportional to a d. Less than the ideal fracture stress e. Proportional to the surface energy y0.5 f. Proportional to the surface energy y

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9) An aircraft component is made of an aluminum alloy that has a fracture toughness of 60MPavm. When a crack of 2.5mm exists in the component, the material fractures when a stress of 440MPA is reached. If a crack of 5.5mm exists in the material, what stress would need to be reached to cause failure?

The material has a hardness value of 50 GPa, and an average crack length of 50 nm. If Young's Modulus is 270 GPa and the applied load is 50 N. What is the fracture toughness value? a. 26.28 MPa.mm1/2 b. 0,2626 MPamm1/2 c. 262.8 MPa.mm1/2 d. 2.628 MPa.mm1/2

Please explain each step briefly.

If a specimen percentage elongation is observed to be 30%. The original length of the specimen is 10 cm. Calculate the final length of the specimen at the fracture. a. 13 mm b. 1.3 mm c. 1300 mm d. 130 mm

Q/Figure i shows the stress and strain curve of a ... metal sample of standard length (250 mm) and diameter (10.3 mm) that has been tested for tensile strength until fracture .. Use the figure to answer the following .. I- Is the material coated (Ductile) or brittle? 2-Why does the curve change downward when the stress is reached? 3-What is the resistance to succumbing to this sample? 4-Calculate the highest tensile strength the sample can withstand? 10 Maximum stress 8. 6 4 1 Fig 1 Strain Stress (Mpa)

please just a three questions left I need answers for them .