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A perfectly elastic-plastic material has a yield stress of 450 MPa and fractures at a strain 0f 0.45. The ratio of resilience to toughness for this material is _____ (answer up to three decimal places) Given the young’s modulus E=4.5 GPa

A perfectly elastic-plastic material has a yield stress of 450 MPa and fractures at a strain 0f 0.45. The ratio of resilience to toughness for this material is _____ (answer up to three decimal places)

Given the young’s modulus E=4.5 GPa

Read lessA steel component is subjected to fatigue loading : σ(maximum)= 200 MPa, σ(minimum)=0. The component has an initial crack length of 1mm. Propagation of crack is governed by: da/dN= 10-12 (ΔK)3, where, the crack length a is in metres, N ...Read more

A steel component is subjected to fatigue loading : σ(maximum)= 200 MPa, σ(minimum)=0. The component has an initial crack length of 1mm. Propagation of crack is governed by: da/dN= 10^{-12 }(ΔK)^{3}, where, the crack length a is in metres, N is the number of cycles and ΔK is in MPa m^{1/3}. The crack length of (in m) after one million cycles will be _____ (answer up to three decimal places)

A material which shows power law behaviour σ- = 50 Ē0.3, is being wire drawn. The maximum strain per pass in annealed condition (assume ideal work and efficiency ƞ=1) is _____. (answer up to two decimal places)

A material which shows power law behaviour σ- = 50 Ē^{0.3}, is being wire drawn. The maximum strain per pass in annealed condition (assume ideal work and efficiency ƞ=1) is _____. (answer up to two decimal places)

A rod is elastically deformed by a uniaxial stress resulting in a strain of 0.02. If the Poisson’s ratio is 0.3, the volumetric strain is ____ .(answer up to three decimal places)

A rod is elastically deformed by a uniaxial stress resulting in a strain of 0.02. If the Poisson’s ratio is 0.3, the volumetric strain is ____ .(answer up to three decimal places)

Read lessA brittle material (young’s modulus= 60 GPa and surface energy =0.5 Jm-2 ) has a surface crack of length 2 µm. the fracture strength (in MPa) of this material is _______ (answer up to two decimal places)

A brittle material (young’s modulus= 60 GPa and surface energy =0.5 Jm^{-2} ) has a surface crack of length 2 µm. the fracture strength (in MPa) of this material is _______ (answer up to two decimal places)

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A single crystal of aluminium is subjected to 10 MPa tensile stress along the [321] crystallographic direction. The resolved shear stress on the (111̅) [101] slip system is ________(in MPa to two decimal places).

A single crystal of aluminium is subjected to 10 MPa tensile stress along the [321] crystallographic direction. The resolved shear stress on the (111̅) [101] slip system is ________(in MPa *to two decimal places)*.

Consider the following stress state imposed on a material: 90 50 0 𝜎 = [50 −20 0 MPa. 0 0 14] If the material ...Read more

Consider the following stress state imposed on a material:

90 50 0

𝜎 = [50 −20 0 MPa.

0 0 14]

If the material responds elastically with a volumetric strain 𝛥 = 3.5 × 10^{−4}, what is its bulk modulus?

(A) 150 GPa (B) 350 GPa

(C) 200 GPa (D) 400 GPa

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The ideal plastic work involved in extruding a cylindrical billet of length 100 mm, from an initial diameter of 20 mm to a final diameter of 16 mm is _______ (in J to one decimal place). The flow stress in compression ...Read more

The ideal plastic work involved in extruding a cylindrical billet of length 100 mm, from an initial diameter of 20 mm to a final diameter of 16 mm is _______ (in J *to one decimal place*).

The flow stress in compression is 40 MPa, and remains constant throughout the process.

Read lessTrue stress – true strain behavior of a metal is given by the flow curve equations = 1750e0.37, where s is in MPa. The true stress at necking (in MPa, rounded off to the nearest integer) is _____.

True stress – true strain behavior of a metal is given by the flow curve equation*s *= 1750*e*0.37, where *s *is in MPa. The true stress at necking (in MPa, rounded off to the nearest integer) is _____.

Cold working of iron leads to increase in dislocation density from 1010 to 1015 m-2. The associated stored energy ( in MJ m-3, rounded off to one decimal place) is _____. Given : Shear modulus of iron = 82 GPa, burger,s ...Read more

Cold working of iron leads to increase in dislocation density from 10^{10 }to 10^{15} m^{-2}. The associated stored energy ( in MJ m^{-3}, rounded off to one decimal place) is _____. Given : Shear modulus of iron = 82 GPa, burger,s vector ‾b= a_{0}/2[111] , a_{0}= 0.2856nm.

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The length of internal cracks in the two samples of same glass is measured to be C1= 0.5mm and C2= 2mm. The ratio of (σ1/σ2) of the fracture strength of the two samples is ______.

The length of internal cracks in the two samples of same glass is measured to be C_{1}= 0.5mm and C_{2}= 2mm. The ratio of (σ_{1}/σ_{2}) of the fracture strength of the two samples is ______.