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 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 100MPa at all connections and that the ultimate normal stress is 250 MPa in each of the1.55two links joining B and D, determine the allowable load P if an overall factor ofsafety of 3.0 is desired.Top viewStatics : Use ABC as free body.-200 mm-412 mm-180mmAB8 mmB十0.20O.18ВFAFeoВ20 mmP-8 mm8 mm-E Mg = 00.20 FA = 0.18 PDD12 mm-Front viewSide viewZMA = O0.20 FBD =0.38 PP= FaD19TUTORIAL GUIDE2 Corect FBDWrong BDBABAcompression)1B??B

As given that ultimate shear stress = 100 MPa and ultimate normal stress = 250 MPa, factor of safety…

Answered: 1.55 In the structure shown, an…

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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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

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

Corect FBD
Wrong BD
B
A
B
A
compression)
1B
??
B

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