Mechanical Behavior of Materials 4th. Edition by Norman E. Dowling | 9780131395060 | 131395068 | Holooly

Mechanics of Materials

Mechanical Behavior of Materials

86 SOLVED PROBLEMS

Question: 15.8

A rectangular beam made of S-590 alloy has depth 2c = 50 mm and thickness b = 20 mm. It is loaded with a moment of M = 1.50 kN·m at a temperature of 725°C. At this temperature, and for stresses in the range 100 to 400 MPa, constants for Eq. 15.71 are m = 10.74 and B = 3.91 × 10^−29, where t is in ...

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The stress at the edge of the beam is obtained dir...

Question: 15.7

A beam is simply supported over a length of L = 100 mm and is loaded at its center with a transverse load of P = 50 N. Its cross section has width b = 15 mm and depth 2c = 10 mm. The material has linear viscoelastic behavior with elastic and steady-state creep strains, similar to the model of ...

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Due to the linear viscoelastic behavior, stresses ...

Question: 15.6

For a given material and temperature, the uniaxial creep behavior follows Eq. 15.39(b). A thin-walled tubular pressure vessel of radius r and wall thickness b has closed ends and is made of this material. Develop an equation for the relative change in radius, Δr/r , as a function of time t and a ...

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we first generalize the uniaxial stress–strain cur...

Question: 15.5

Consider the situation of Ex. 15.2 and 15.3, where a component made of alloy S-590 is subjected to a stress of 200 MPa at a temperature of 600°C. (a) Repeat the rupture life calculation of Ex. 15.3, using the Eq. 15.20 fit for PLM. (b) If the desired service life is 1.5 years, what are the safety ...

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(a) From Table 15.3, the S-590 alloy constants for...

Question: 15.4

The creep–rupture data for alloy S-590 plotted in Fig. 15.8 are given in Table E15.4(a), where, for each test, the temperature T, stress σ, and rupture time tr are listed. Employ these data as follows: (a) On the basis of Eq. 15.19, obtain a fitted equation relating the Sherby–Dorn parameter to ...

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(a) First calculate x = log σ and

P_{SD}[/l...

Question: B.1

The results of a number of fracture toughness tests on dolomitic limestone are given in Table B.1. Determine the sample values of the mean, standard deviation, and coefficient of variation. ...

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Equations B.1 to B.3

\bar{x}=\frac{1}{n} \s...

Question: 15.3

Consider again Example 15.2, using the Larson–Miller parameter. ...

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The logic is the same as before, except that now [...

Question: 15.2

An engineering component made of the heat-resisting Fe-Cr-Ni-Co alloy S-590 is subjected in service to a static stress of 200 MPa at a temperature of 600°C. What creep–rupture life in days is expected? ...

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Figure 15.21 provides the needed stress versus [la...

Question: 15.1

Consider nickel with the same grain size and processing as the material of Fig. 15.16. This material is subjected to a tensile stress of 6 MPa at a temperature of 900°C. What is the approximate strain rate, and what creep mechanism is dominant? ...

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To enter the map, we need τ and G from Eqs. 15.12 ...

Question: 14.4

A shaft made of hot-rolled and normalized SAE 1045 steel is loaded in bending and has a diameter change, as in Fig. A.12(b) of Appendix A. The stress concentration factor for the fillet radius is kt = 3.00, and the member is repeatedly subjected to the history of net section nominal stress shown in ...

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The constants for this material’s cyclic stress–st...

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