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4 Solved Questions on Machine Design - Assignment | ME 401, Assignments of Machine Design

Material Type: Assignment; Professor: Lulay; Class: Machine Design; Subject: Mechanical Engineering; University: University of Portland; Term: Unknown 1989;

Typology: Assignments

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Uploaded on 08/17/2009

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ME
401 -Machine Design
Assignment 2
How
much torque can a 0.500 inch diameter bar carry before failure? Failure is
l0pb
1.
defined as either yielding
or
fracture -which ever comes first.
How
will
the
following materials fail (yield
or
fracture)? What failure theory(s) would be
appropriate
to
apply
to
these? Hint, see appendix, including A-24.
a)
ASTM
class 20 gray
cast
iron
b) AISI 1040
HR
2.
Using a factor
of
safety
of3
against yielding,
what
is the minimum yield strength
I()~
required for apart
to
carry aload
of
cr
x=
l20MPa,
cry
= - 100MPa and
'txy
=
50MPa
applied at a point?
Use
both the maximum shear stress theory and maximum
distortion energy theory -and compare (briefly discuss) the difference.
3. Design a round bar based
on
the
criteria in the following table. "Design" for this
problem means selecting a specific material (including heat treating
if
any) and
determining
the
diameter.
You
must also select an appropriate factor
of
safety.
IOr
fs
Assume this part
if
for a bridge, failure will cause significant damage
to
the bridge
but will
not
cause it
to
collapse, there is a sign
on
the bridge that says
"maximum
allowable vehicle weight is 30,000 pounds (only
two
vehicles could fit
on
the bridge
at the same time), and
the
load criterion (#2) is based
off
of
a total load
of
60,000
pounds
on
the bridge.
I,
# Criteria Priority Description
II
1 Withstand operation at temperatures between -20°F
to
160°F Essential
1
2
il
Withstand static load
of
15,000 lb. Axial, near
continuous. Essential
II
3 20 inches long Essential
14
Low
weight
High
Less is better
16
Low
cost Desired Less is
better
Problem 4 is
on
the backside.
pf3
pf4
pf5
pf8
pf9

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ME 401 - Machine Design Assignment 2

l0pb 1. How^ much torque can a 0.500 inch diameter bar carry before failure?^ Failure is

defined as either yielding or fracture - which ever comes first. How will the following materials fail (yield or fracture)? What failure theory(s) would be appropriate to apply to these? Hint, see appendix, including A-24. a) ASTM class 20 gray cast iron b) AISI 1040 HR

  1. Using a factor of safety of3 against yielding, what is the minimum yield strength

I()~ required for a part^ to^ carry a load^ of^ cr^ x =^ l20MPa,^ cry^ = -^ 100MPa and^ 'txy^ =^ 50MPa

applied at a point? Use both the maximum shear stress theory and maximum distortion energy theory - and compare (briefly discuss) the difference.

  1. Design a round bar based on the criteria in the following table. "Design" for this problem means selecting a specific material (including heat treating if any) and determining the diameter. You must also select an appropriate factor of safety. IOrfs^ Assume this part if for a bridge, failure will cause significant damage to the bridge but will not cause it to collapse, there is a sign on the bridge that says "maximum allowable vehicle weight is 30,000 pounds (only two vehicles could fit on the bridge at the same time), and the load criterion (#2) is based off of a total load of 60, pounds on the bridge.

I, # Criteria Priority Description

II 1 Withstand operation at temperatures between -20°F^ to 160°F

Essential

1

il

Withstand static load of 15,000 lb. Axial, near continuous.

Essential

II 3 20 inches long^ Essential 14 Low weight High Less is better 16 Low^ cost^ Desired^ Less is^ better

Problem 4 is on the backside.

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