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Design otter Joint

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Socket and Spigot Cotter Joint

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1. Failure of the rods in tension

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3. Failure of the rod or cotter in crushing

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5. Failure of cotter in shear

Considering the failure of cotter in shear as shown in Fig.

12.4. Since the cotter is in double

shear, therefore shearing area of the cotter

= 2 b t

and shearing strength of the cotter=2 b t

Equating this to load (P), we have

P =2 b t

From this equation, width of cotter (b) is determined.

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6. Failure of the socket collar in crushing

Considering the failure of socket collar in crushing

We know that area that resists crushing of socketcollar

=(d4 d2) tand crushing strength =(d4 d2) t c

Equating this to load (P), we have

P =(d4 d2) t cFrom this equation, the diameter of socket collar(d4) may be obtained.

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7. Failure of socket end in shearing

Since the socket end is in double shear, thereforearea that

resists shearing of socket collar

=2 (d4 d2) cand shearing strength of socket collar

=2 (d4 d2) c

Equating this to load (P), we have

P =2 (d4 d2) c

From this equation, the thickness of socket collar (c)may be obtained.

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