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QUESTION: 1

Two plates are joined by double strap butt joints with rivets arrangement as shown in the figure. Width of the plate is 300mm and diameter of rivets 30mm. The thickness of the plates can be taken as 20mm.Allowable stress in tension, shear and compression are 80 N/mm²,60 N/mm² and 160N/mm².

**Q.** Calculate the shear resistance of 1 rivet along A-A.

Solution:

Explanation: P=2x[τ x πd²/4].

QUESTION: 2

Two plates are joined by double strap butt joints with rivets arrangement as shown in the figure. Width of the plate is 300mm and diameter of rivets 30mm. The thickness of the plates can be taken as 20mm.Allowable stress in tension, shear and compression are 80 N/mm²,60 N/mm² and 160N/mm².

**Q.** Calculate the tensile strength of rivet along A-A.

Solution:

Explanation: Strength=(w-d)xtxσ.

QUESTION: 3

Two plates are joined by double strap butt joints with rivets arrangement as shown in the figure. Width of the plate is 300mm and diameter of rivets 30mm. The thickness of the plates can be taken as 20mm.Allowable stress in tension, shear and compression are 80 N/mm²,60 N/mm² and 160N/mm².

**Q.** Calculate the tensile strength of rivets along B-B.

Solution:

Explanation: To fail along B-B, rivet in outermost row must undergo shear failure. Strength = (w-2d)x σ x t + 1xP(shear) = (300-60)x80x20/1000 + 84.8.

QUESTION: 4

**Q.** Calculate the tensile strength of rivets along C-C.

Solution:

Explanation: To fail along C-C, rivets in outer rows must undergo shear failure. Strength= (w-3d)x σ x t + 3xP(shear) = (300-90)x80x20/1000 + 3×84.8.

QUESTION: 5

**Q.** Calculate efficiency of the joint.

Solution:

Explanatio: Strength along A-A, B-B and C-C are 432kN, 468.8kN and 590.4kN and strength of solid plate=wσt=480kN. Lowes is along AA. Hence efficiency=432/480.

QUESTION: 6

**Q.** Calculate the crushing resistance of 1 rivet.

Solution:

Explanation: P=dtσ= 30x20x160=96kN.

QUESTION: 7

**Q.** Calculate the pitch of the rivets.

Solution:

Explanation: m+p+p+m=w where m=1.5d.

QUESTION: 8

**Q.** The type of arrangement shown is

Solution:

Explanation: Lozenge joint is other name of diamond shape joint.

QUESTION: 9

**Q. **If circumferential stress is P, then longitudinal stress in the pressure vessel is?

Solution:

Explanation: Circumferential stress=2x longitudinal stress.

QUESTION: 10

**Q. **If width of plate=80mm ad diameter of rivets 10mm, then pitch will be?

Solution:

Explanation: p+2m=w or p+2×1.5×10=80.

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