Question 6.76: Write and test computer subroutines or procedures that will ...

Write and test computer subroutines or procedures that will implement
(a) Table 6–2, returning a, b, C, and \bar{k}_{a} .
(b) Equation (6–20) using Table 6–4, returning k_{b} .
(c) Table 6–11, returning α, β, C, and \bar{k}_{c} .
(d) Equations (6–27) and (6–75), returning \bar{k}_{d} \text { and } C_{k d} .

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Eq. (6-19): k_{a}=a S_{u t}^{b}

Eq. (6-20): k_{b}= \begin{cases}(d / 0.3)^{-0.107}=0.879 d^{-0.107} & 0.11 \leq d \leq 2 \text { in } \\ 0.91 d^{-0.157} & 2<d \leq 10 \text { in } \\ (d / 7.62)^{-0.107}=1.24 d^{-0.107} & 2.79 \leq d \leq 51 mm \\ 1.51 d^{-0.157} & 51<d \leq 254 mm \end{cases}

Eq. (6-27): \begin{aligned}k_{d}=& 0.975+0.432\left(10^{-3}\right) T_{F}-0.115\left(10^{-5}\right) T_{F}^{2} \\&+0.104\left(10^{-8}\right) T_{F}^{3}-0.595\left(10^{-12}\right) T_{F}^{4}\end{aligned}

where 70 \leq T_{F} \leq 1000^{\circ} F.

Eq. (6-75): k _{d}=\bar{k}_{d} L N (1,0.11)

where  \bar{k}_{d}=k_{d} given by Eq. (6–27),

 

 

Table 6–2
Parameters for Marin Surface Modification Factor, Eq. (6–19)
Surface Finish Factor a Exponent
b
S _{\text {ut}}, \text { kpsi } S_{u t}, M P a
Ground 1.34 1.58 −0.085
Machined or cold-drawn 2.70 4.51 −0.265
Hot-rolled 14.4 57.7 −0.718
As-forged 39.9 272. −0.995
Table 6–4
Effect of Operating
Temperature on the
Tensile Strength of
Steel.* (S_{T} = tensile
strength at operating
temperature;
S_{R T} = tensile strength
at room temperature;0.099 \leq \hat{\sigma} \leq 0.110)
Temperature, °C S_{T} / S_{R T} Temperature, °F S_{T} / S_{R T}
20 1.000 70 1.000
50 1.010 100 1.008
100 1.020 200 1.020
150 1.025 300 1.024
200 1.020 400 1.018
250 1.000 500 0.995
300 0.975 600 0.963
350 0.943 700 0.927
400 0.900 800 0.872
450 0.843 900 0.797
500 0.768 1000 0.698
550 0.672 1100 0.567
600 0.549
*Data source: Fig. 2–9.

Write and test computer subroutines or procedures that will implement (a) Table 6–2, returning a, b, C, and ka . (b) Equation (6–20) using Table 6–4, returning kb . (c) Table 6–11, returning α, β, C, and kc . (d) Equations (6–27) and (6–75), returning kd and Ckd .

 

Table 6–11
Parameters in Marin
Loading Factor
k _{ c }=\alpha \overline{ S }_{ u }^{-\beta} L N ( 1 , C )
Mode of Loading \alpha
kpsi MPa \beta C Average k_{c}
Bending 1 1 0 0 1
Axial 1.23 1.43 −0.0778 0.125 0.85
Torsion 0.328 0.258 0.125 0.125 0.59
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