1.55 In the structure shown, an 8-mm-diameter pin is used at A, and 12-mm- diameter pins are used at B and D. Knowing that the ultimate shearing stress is 100 MPa at all connections and that the ultimate normal stress is 250 MPa in each of the two links joining B and D, determine the allowable load P if an overall factor of safety of 3.0 is desired. Top view Statics : Use ABC as free body. -200 mm--180 mm- /12 mm A B 8 mm K-0.20- 0.18 FA Feo C 20 mm P +8 mm 8 mm E Me = 0 0.20 FA = 0.18 P %3D D 12 mm P= FA Front view Side view
1.55 In the structure shown, an 8-mm-diameter pin is used at A, and 12-mm- diameter pins are used at B and D. Knowing that the ultimate shearing stress is 100 MPa at all connections and that the ultimate normal stress is 250 MPa in each of the two links joining B and D, determine the allowable load P if an overall factor of safety of 3.0 is desired. Top view Statics : Use ABC as free body. -200 mm--180 mm- /12 mm A B 8 mm K-0.20- 0.18 FA Feo C 20 mm P +8 mm 8 mm E Me = 0 0.20 FA = 0.18 P %3D D 12 mm P= FA Front view Side view
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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Question
On the FBD of 'ABC', where force b is pointing upwards, as such Bar BD will be in compression, since equal and opposite reaction on B.
My question is , What if i assume force B to be pointing downwards on the FBD of 'ABC' as shown in the 2nd image's "Wrong FBD", how can i solve to know that bar BD is in compression
Transcribed Image Text:In the structure shown, an 8-mm-diameter pin is used at A, and 12-mm-
diameter pins are used at B and D. Knowing that the ultimate shearing stress is 100
MPa at all connections and that the ultimate normal stress is 250 MPa in each of the
1.55
two links joining B and D, determine the allowable load P if an overall factor of
safety of 3.0 is desired.
Top view
Statics : Use ABC as free body.
-200 mm-
412 mm
-180
mm
A
B
8 mm
B
十
0.20
O.18
В
FA
Feo
В
20 mm
P
-8 mm
8 mm-
E Mg = 0
0.20 FA = 0.18 P
D
D
12 mm-
Front view
Side view
ZMA = O
0.20 FBD =0.38 P
P= FaD
19
TUTORIAL GUIDE
2
Transcribed Image Text:Corect FBD
Wrong BD
B
A
B
A
compression)
1B
??
B
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