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Askmemetallurgy Official
Askmemetallurgy Official
Asked: February 25, 2022In: Mechanical Metallurgy

GATE MT 2022 Q46

Given the stress tensor, the maximum shear stress is     MPa (round off to the nearest integer).

Given the stress tensor, the maximum shear stress is     MPa (round off to the nearest integer).

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Askmemetallurgy Official
Askmemetallurgy Official
Asked: February 25, 2022In: Mechanical Metallurgy

GATE MT 2022 Q36

High cycle fatigue data for an alloy at various alternating stresses, 𝜎a (see figure) is given below. A specimen of this alloy is subjected to multiple stress cycles sequentially in the following order: (i) first 5000 cycles at σa = ...Read more

High cycle fatigue data for an alloy at various alternating stresses, 𝜎a (see figure) is given below.

A specimen of this alloy is subjected to multiple stress cycles sequentially in the following order: (i) first 5000 cycles at σa = 400 MPa followed by (ii) 25000 cycles at σa = 300 MPa and finally (iii) at σa = 500 MPa. Assuming that Miner’s law is obeyed, the number of cycles to failure at the final applied stress of

500 MPa is                     .

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Askmemetallurgy Official
Askmemetallurgy Official
Asked: February 25, 2022In: Mechanical Metallurgy

GATE MT 2022 Q34.

Consider a tilt boundary of misorientation of 2o in an aluminium grain. The lattice parameter of aluminium is 0.143 nm. The spacing between the dislocations that form the tilt boundary is  ______ nm (round off to 2 decimal places).

Consider a tilt boundary of misorientation of 2o in an aluminium grain. The lattice parameter of aluminium is 0.143 nm. The spacing between the dislocations that form the tilt boundary is  ______ nm (round off to 2 decimal places).

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Askmemetallurgy Official
Askmemetallurgy Official
Asked: February 25, 2022In: Mechanical Metallurgy

GATE MT 2022 Q30.

From high temperature tensile testing, the flow stress (measured at the same   value of strain) of an alloy was found to be 50 MPa at a strain rate of 0.1 s–1 and 70 MPa at a strain rate of 10 ...Read more

From high temperature tensile testing, the flow stress (measured at the same   value of strain) of an alloy was found to be 50 MPa at a strain rate of 0.1 s–1 and 70 MPa at a strain rate of 10 s–1. The strain rate sensitivity parameter is             (round off to 3 decimal places).

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Askmemetallurgy Official
Askmemetallurgy Official
Asked: February 25, 2022In: Mechanical Metallurgy

GATE MT 2022 Q26. Match the phenomena (Column I) with the descriptions (Column II)

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Askmemetallurgy Official
Askmemetallurgy Official
Asked: February 25, 2022In: Mechanical Metallurgy

GATE MT 2022 Q25.

Find the correct match between dislocation reactions (Column A) to the descriptions (Column B)

Find the correct match between dislocation reactions (Column A) to the descriptions (Column B)

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Askmemetallurgy Official
Poll
Askmemetallurgy Official
Asked: February 25, 2022In: Mechanical Metallurgy

GATE MT 2022 Q21. Given the strain rate (𝜖̇), dislocation density (𝜌), dislocation velocity (𝑣), which   of the following relationship(s) is(are) correct? Assume that Orowan equation for plastic flow due to the dislocation movement is obeyed.

Poll Results

0% (A) 𝜖̇ ∝ 𝑣2
50% (B) 𝜖̇ ∝ 𝑣 ( 2 voters )
25% (C) 𝜖̇ ∝ 𝜌2 ( 1 voter )
25% (D) 𝜖̇ ∝ 𝜌 ( 1 voter )
Based On 4 Votes

Participate in Poll, Choose Your Answer.

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Askmemetallurgy Official
Poll
Askmemetallurgy Official
Asked: February 25, 2022In: Mechanical Metallurgy

GATE MT 2022 Q17. With reference to the stress intensity factor, find the correct match of nomenclature (Column A) with the mode of deformation applied to the crack (Column B).

Poll Results

100% (A) P- Z, Q - Y, R - X ( 1 voter )
0% (B) P - Z, Q - X, R - Y
0% (C) P - Y, Q - X, R - Z
0% (D) P - Y, Q - Z, R - X
Based On 1 Vote

Participate in Poll, Choose Your Answer.

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Askmemetallurgy Official
Poll
Askmemetallurgy Official
Asked: February 25, 2022In: Mechanical Metallurgy

GATE MT 2022 Q14. For a material that undergoes strain hardening, necking instability occurs during tensile  testing when ______ . Given: σ = true stress and ϵ = true strain.   

Poll Results

16.67%(A) 𝑑𝜎/𝑑𝜖 = 0 ( 1 voter )
33.33% (B) 𝑑𝜎/ 𝑑𝜖 = ϵ ( 2 voters )
50% (C) 𝑑𝜎 / 𝑑𝜖 = σ ( 3 voters )
0% (D) 𝑑𝜎 / 𝑑𝜖 = ∞
Based On 6 Votes

Participate in Poll, Choose Your Answer.

     

     

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Dan Watson
Dan Watson
Asked: January 24, 2022In: Mechanical Metallurgy

What is the difference beween annealing and stress relief of carbon steel? what are the changes occurring in the structure of the steel in each?

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suraj
suraj
Asked: December 20, 2021In: Mechanical Metallurgy

What is rupture

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xavi
xavi
Asked: October 30, 2021In: Mechanical Metallurgy

Why is lower yield point preferred over upper yield point?

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suraj
suraj
Asked: September 30, 2021In: Mechanical Metallurgy

Why a vertical array of edge dislocation of the same sign is in stable equilibrium??

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suraj
suraj
Asked: September 28, 2021In: Mechanical Metallurgy

Why a material having low stacking fault energy strain harden more rapidly?

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Sage Mode
Sage Mode
Asked: September 27, 2021In: Mechanical Metallurgy

In yield point phenomenon dislocation tends to accumulate at grain boundaries after released by interstitial atoms. Is this statement true? If not, state the true statement.

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suraj
suraj
Asked: September 23, 2021In: Mechanical Metallurgy

How does favorable compressive residual stress increases fatigue life?

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vsnikhil3
vsnikhil3Copper
Asked: September 15, 2021In: Mechanical Metallurgy

Why aluminium doesn’t shows yield point phenomena

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vsnikhil3
vsnikhil3Copper
Asked: September 14, 2021In: Mechanical Metallurgy

Why bauschinger effect is not considered in plasticity

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A.S@97
[email protected]
Asked: September 10, 2021In: Mechanical Metallurgy

The dislocation can move through process known as slip when the energy reaches critical rate O sufficiently shear stress acting parallel to dislocation line O sufficiently shear stress acting parallel to Burger vector O sufficiently shear stress acting perpendicular to slip plane O

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lopamudra
lopamudra
Asked: September 7, 2021In: Mechanical Metallurgy

In general atomic diffusion is higher in GB than in bulk. But is it also follow at lower temperature?

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xavi
xavi
Asked: August 22, 2021In: Mechanical Metallurgy

For slip to occur in polycrystalline materials, 5 independent slip systems are required. My question is what’s so sacrosanct about 5 slip systems, kindly explain.

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srilekha v
srilekha v
Asked: August 7, 2021In: Mechanical Metallurgy

cross slip is prevalent in materials with ______?

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Lopamudra Singh
Lopamudra Singh
Asked: August 2, 2021In: Mechanical Metallurgy

Why resistivity increase upon increase in vacancies?

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Answer
Ashish lisu
Ashish lisuIron
Asked: July 8, 2021In: Mechanical Metallurgy

in cold working or hot working, for which process residual stresses will be more in the final product and why? why Cold working have better surface finish?

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Answer
Ashish lisu
Ashish lisuIron
Asked: July 8, 2021In: Mechanical Metallurgy

how do fatigue failure occur even if the applied stress is below yield stress?

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