4. A lug wrench is subjected to loads, as shown in the figure below. The tool body is a hollow cylinder (assume a thin tube) with an outer diameter D = 25 mm, and thickness t. Ignore the changes in diameter (i.e., assume they are all the same), and model it as a cantilever beam. A is on the outer diameter. Ꮓ x y 500N(+z) 500 mm 250N 350 mm 500N(-z) 350 mm 250N ▲ Z Element A a. Sketch element A and show the stress state. Be sure to label the coordinate axes on the element. Make sure you calculate the normal (σ) and shear stresses (T). b. If the tool is made from aluminum with E = 70 GPa, SUT = 185 MPa, and S = 76 MPa. Find the thickness t such y that at A the safety factor is 2. (Use the distortion energy method). Useful formulas for this problem (from your equation 3 лDt; I = àƉ°t/8; J πD³t/8; sheet): AлDt; I = 3 = πD˚t/4

Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
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Question
4. A lug wrench is subjected to loads, as shown in the
figure below. The tool body is a hollow cylinder
(assume a thin tube) with an outer diameter
D = 25 mm, and thickness t. Ignore the changes in
diameter (i.e., assume they are all the same), and
model it as a cantilever beam. A is on the outer
diameter.
Ꮓ
x
y
500N(+z)
500 mm
250N
350 mm
500N(-z)
350 mm
250N
▲ Z
Element A
a.
Sketch element A and show the stress state.
Be sure to label the coordinate axes on the
element. Make sure you calculate the
normal (σ) and shear stresses (T).
b. If the tool is made from aluminum with
E = 70 GPa, SUT = 185 MPa, and
S = 76 MPa. Find the thickness t such
y
that at A the safety factor is 2. (Use the
distortion energy method).
Useful formulas for this problem (from your equation
3
лDt; I = àƉ°t/8; J
πD³t/8;
sheet): AлDt; I =
3
= πD˚t/4
Transcribed Image Text:4. A lug wrench is subjected to loads, as shown in the figure below. The tool body is a hollow cylinder (assume a thin tube) with an outer diameter D = 25 mm, and thickness t. Ignore the changes in diameter (i.e., assume they are all the same), and model it as a cantilever beam. A is on the outer diameter. Ꮓ x y 500N(+z) 500 mm 250N 350 mm 500N(-z) 350 mm 250N ▲ Z Element A a. Sketch element A and show the stress state. Be sure to label the coordinate axes on the element. Make sure you calculate the normal (σ) and shear stresses (T). b. If the tool is made from aluminum with E = 70 GPa, SUT = 185 MPa, and S = 76 MPa. Find the thickness t such y that at A the safety factor is 2. (Use the distortion energy method). Useful formulas for this problem (from your equation 3 лDt; I = àƉ°t/8; J πD³t/8; sheet): AлDt; I = 3 = πD˚t/4
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