Welding: Principles and Applications (MindTap Course List)
8th Edition
ISBN: 9781305494695
Author: Larry Jeffus
Publisher: Cengage Learning
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Textbook Question
Chapter 2, Problem 14R
What special protective items can be worn to provide extra protection for a welder's hands, arms, body, waist, legs, and feet?
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Consider the bar, shown in Figure 1 that undergoes axial displacement due to both a distributed load
and a point force. The bar is of cross-sectional area A = 1.10-3 m², and has a modulus of elasticity
E = 100 GPa.
1(x) = 5 kN/m
x=0.0
x=2.0
2.0m
10 kN
Figure 1: Bar domain with varying distributed forces.
a) The general form of the governing equations describing the bar's displacement, u(x), is given by,
d
(AE du(x))
-) +1(x) = 0.
d.x
dx
What are the accompanying boundary conditions for this bar?
b) Using the mesh in Figure 2, form the basis functions associated with element 2 and write the FEM
approximation over the element.
1
2
3
1
2
1m
1m
Figure 2: Mesh of 2 elements. Elements are numbered with underlines.
c) The general form of the element stiffness matrix system, with nodes indexed by i and j, is,
AE
Uj
N;(x)l(x)dx
– Ng(0)f(0)
¥ [4]}]{{}}={{{}\(\\+} + {N(2)f(2) = N (0)5() },
(1)
0, respectively.
L
=
(2)
where f(2) and f(0) denote the boundary forces at positions x 2 and x
Evaluate…
answer please
Chapter 2 Solutions
Welding: Principles and Applications (MindTap Course List)
Ch. 2 - What is the key to preventing accidents in a...Ch. 2 - Who is ultimately responsible for the welder’s...Ch. 2 - Describe the three classifications of burns.Ch. 2 - What emergency steps should be taken to treat...Ch. 2 - List the three types of light that may be present...Ch. 2 - Which type of light is the most likely to cause...Ch. 2 - What can be done on the job site to reduce the...Ch. 2 - What is the name of the eye burn that can occur in...Ch. 2 - In what two ways can ultraviolet light burn the...Ch. 2 - Why is it important to seek medical treatment for...
Ch. 2 - What fabric(s) are the best choice to wear as...Ch. 2 - Describe the ideal work shirt, pants, boots, and...Ch. 2 - Why is it unsafe to carry butane lighters or...Ch. 2 - What special protective items can be worn to...Ch. 2 - Why must eye protection be worn at all times in...Ch. 2 - What types of injuries can occur to the ears...Ch. 2 - What types of protection are available to protect...Ch. 2 - What types of information should be covered in a...Ch. 2 - Name two types of respirators and describe how...Ch. 2 - List the materials that can give off dangerous...Ch. 2 - Why must metal that has been used before be...Ch. 2 - Under what conditions can natural ventilation be...Ch. 2 - Name two advantages of recycling scrap metal.Ch. 2 - When must forced ventilation be used?Ch. 2 - Who must be provided with safety data sheets...Ch. 2 - Describe an acceptable storage area for a cylinder...Ch. 2 - How must high-pressure gas cylinders be stored so...Ch. 2 - What should be done with a leaking cylinder if the...Ch. 2 - Why is it important for acetylene cylinders to not...Ch. 2 - What is hot work?Ch. 2 - How far away should highly combustible materials...Ch. 2 - When is a fire watch needed?Ch. 2 - List the four types of fire extinguishers and the...Ch. 2 - Why is it important to have a planned maintenance...Ch. 2 - Why is it important to keep a welding area clean?Ch. 2 - What should you do if you have to leave a piece of...Ch. 2 - Why must a mushroomed chisel or hammer be...Ch. 2 - What causes most electric shock in the welding...Ch. 2 - According to the Welding Safety Checklist in...Ch. 2 - What can happen if too much power is being carried...Ch. 2 - Why must equipment be turned off and unplugged...Ch. 2 - According to Table 2-2, what gauge wire size would...Ch. 2 - What is a GFCI?Ch. 2 - List five safety tips for safe extension cord use.Ch. 2 - List 10 safety rules for the safe use of portable...Ch. 2 - Why is it important to not weld when everything is...Ch. 2 - List two types of grinders used by welders.Ch. 2 - How close to the grinding stone face should the...Ch. 2 - Name metal cutting machines used in the welding...Ch. 2 - Describe how a person should safely lift a heavy...Ch. 2 - List the things that should be inspected on a...Ch. 2 - List and explain five ladder use safety rules.
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- amination) Question 1 Consider the bar, shown in Figure 1, that undergoes axial displacement due to both a distributed load and a point force. The bar is of cross-sectional area A = 1.103 m2, and has a modulus of elasticity E = 100 GPa. 1(x) = 5 kN/m 10 kN X x=0.0 x=2.0 2.0m Figure 1: Bar domain with varying distributed forces. a) The general form of the governing equations describing the bar's displacement, u(x), is given by, d (AE du(x)) + 1(x) = 0. dx dx What are the accompanying boundary conditions for this bar? MacBook Air a 会 DII F5 F6 F7 F8 80 F3 F4 0/ 20 [8 marksl 8 FOarrow_forwardAnswer Barrow_forwardfem helpUsing the mesh in Figure 2, form the basis functions associated with element 2 and write the FEMapproximation over the element.arrow_forward
- Answer carrow_forwardshow workingarrow_forwardCFD help Figure 3: Advection equation, solution for three different timesteps. Q1) Provide an explanation what conditions and numerical setup could explain the curves. Identify which of the three curves is the first, second and third timestep.arrow_forward
- answer pleasearrow_forwardFigure 3 shows the numerical solution of the advection equation for a scalar u along x at three consecutive timesteps. 1.0 0.8- 0.6 0.4- 0.2 0.0 00 -0.2 -0.4 -0.6- 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 Figure 3: Advection equation, solution for three different timesteps.arrow_forwardQuestion 2 Figure 3 shows the numerical solution of the advection equation for a scalar u along x at three consecutive timesteps. 1.0 0.8- 0.6- 0.4- 0.2- 0.0- -0.2- -0.4- -0.6 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 Figure 3: Advection equation, solution for three different timesteps. a) Provide an explanation what conditions and numerical setup could explain the curves. Identify which of the three curves is the first, second and third timestep. b) Consider explicit schemes with central and upwind discretisations. Explain how each of these candidate discretisations could produce the behaviour shown in Figure 3. c) Determine the CFL number that was used in the simulation for each of the candidate schemes for all possible updates. Assume that the timestep and mesh-width used are constant. Read the data to two digits of accuracy from Figure 4 shown at the end of the question, which is an enlarged version of Figure 3. Demonstrate your method and input data for one calculation, but then use a…arrow_forward
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