Q.1 The yield stresses (oy) have been measured using steel and aluminum specimens of various grain sizes, as follows: Material D (µm) Oy (MPa) Steel 60.5 160 136 128 Aluminum 11.1 235 100 223 (a) Determine the coefficients ơo and kỵ in the Hall- Petch for these two materials. (b) Determine the vield stress in each material for a grain size of d=26 um.

Q.1 The yield stresses (oy) have been measured using steel and aluminum specimens of various grain sizes, as follows: Material D (µm) Oy (MPa) Steel 60.5 160 136 128 Aluminum 11.1 235 100 223 (a) Determine the coefficients ơo and kỵ in the Hall- Petch for these two materials. (b) Determine the vield stress in each material for a grain size of d=26 um.

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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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

Q.1
The yield stresses (oy) have been measured using steel and aluminum specimens of various grain sizes,
as follows:
Material
D (µm)
σΥ (MPa)
Steel
60.5
160
136
128
Aluminum
11.1
235
100
223
(a) Determine the coefficients o and kỵ in the Hall- Petch for these two materials.
(b) Determine the yield stress in each material for a grain size of d=26 um.

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