2.a) As an engineer, choose a desired fracture mode in metals with one (1) reason.b) Sketch the fracture behaviour in metals.c)i. The modulus of elasticity of a metal alloy A is 260 GPa. Compute the specific surfaceenergy if propagation of an internal crack of length 0.40 mm is observed when a stressof 63 MPa is applied to the alloy.ii. The elastic deformation energy of alloy A is 3.0 J/m². Based on the answer obtained inc)(i), show whether alloy A is an elastic deformation or a plastic deformation.iii. Interpret if alloy A can be classified as a brittle or a ductile material.d)i. A metal with an internal crack is loaded with a tensile stress of 15 MPa. If the cracklength and the radius of curvature are 2.6 x 10-2 mm and 1.1 x 10-4 mm, compute itsmaximum stress.ii. The modulus of elasticity of the metal is 90 GPa and the specific surfaceenergy is 2.6 J/m2. Based on its critical stress, show that the crack will not grow whena tensile stress of 15 MPa is loaded on it.

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a) As an engineer, choose a desired fracture mode in metals with one (1) reason. b) Sketch the fracture behaviour in metals. c) i. The modulus of elasticity of a metal alloy A is 260 GPa. Compute the specific surface energy if propagation of an internal crack of length 0.40 mm is observed when a stress of 63 MPa is applied to the alloy.

a) As an engineer, choose a desired fracture mode in metals with one (1) reason. b) Sketch the fracture behaviour in metals. c) i. The modulus of elasticity of a metal alloy A is 260 GPa. Compute the specific surface energy if propagation of an internal crack of length 0.40 mm is observed when a stress of 63 MPa is applied to the alloy.

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Concept explainers

Material Properties

Construction in civil engineering demands high strength, durability, and longevity. These targets can be achieved by better design and analysis, along with the correct choice of materials. Different materials have different properties and hence, they respond and performs differently under the various condition of external loadings. It is therefore a critical task of an engineer to select the right material based on the property that the material is supposed to function in real-time. When speaking about the property, there are different categories of material properties like chemical property, physical property, mechanical property, electrical property, magnetic property, thermal property, etc. These material properties form the basis of material selection in various applications.

Question

2.
a) As an engineer, choose a desired fracture mode in metals with one (1) reason.
b) Sketch the fracture behaviour in metals.
c)
i. The modulus of elasticity of a metal alloy A is 260 GPa. Compute the specific surface
energy if propagation of an internal crack of length 0.40 mm is observed when a stress
of 63 MPa is applied to the alloy.
ii. The elastic deformation energy of alloy A is 3.0 J/m². Based on the answer obtained in
c)(i), show whether alloy A is an elastic deformation or a plastic deformation.
iii. Interpret if alloy A can be classified as a brittle or a ductile material.
d)
i. A metal with an internal crack is loaded with a tensile stress of 15 MPa. If the crack
length and the radius of curvature are 2.6 x 10-2 mm and 1.1 x 10-4 mm, compute its
maximum stress.
ii. The modulus of elasticity of the metal is 90 GPa and the specific surface
energy is 2.6 J/m2. Based on its critical stress, show that the crack will not grow when
a tensile stress of 15 MPa is loaded on it.

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