25 Questions
What is the function of a lap joint in form closing principles?
To maintain the flow of flux on compressed & sheared surfaces.
What are the types of form closing joints described in the text?
Riveting, pins & dowel pins, polymer form closing
What is the recommended play for a rivet with a diameter of 22mm?
0.5mm
What is considered as a 'semi-permanent' joint in assembly?
A general riveted joint
What is the material used in the dimensioning example?
Danamid
What is the width of the clip in the dimensioning example?
5 mm
What is the thickness of the clip (h) determined from deflection in the dimensioning example?
1.42 mm
What is the deflection force in the dimensioning example?
3.77 N
What is the assembly force in the dimensioning example?
5.96 N
What is the value of Q in the pressure force calculation?
Q = f imes d imes E imes X
What is the equation for determining the thickness of the clip (h) from deflection in the dimensioning example?
h = 0.67 imes rac{ ext{deflection} imes l^2}{ ext{force}}
What is the value of F in the tangential stress distribution calculation?
F = Q imes an( heta + ho) = Q imes (1 - ext{friction coefficient} imes an( heta))
What are the main states of stress in a rivet construction?
Tension and shearing
What are the different types of standardized pins used in detachable joints?
Cylindrical, taper pins, Groove pins, Dowel pins, spring dowel pins
What are the standardized types of clevis pins?
Standard dowel pin, clevis pin with cotter pin hole, headed clevis pin, threaded clevis pin
What are the major states of stress for interference fitted pins and clearance fitted pins?
Interference fitted pins: shearing; Clearance fitted pins: bending
What is the effect of vertical load on the rivet pattern as described in the Elastic 'cushion' model?
The rivet twists under the torque, resulting in a force proportional to the displacement
What is the purpose of polymer clip joints in joint assembly?
To go to a non-strain standstill position when the connecting parts have interference during assembly
What is the maximum temporary strain in polymer clip joints?
3-5%
What are the general considerations in the calculation of clipping?
Allowable sagging, allowable strain, beam length, beam height, beam width, neutral line, cross section factor
What should the allowable strain values be considered as in regular clipping calculations?
60% of the values
What are the nomenclature elements used in the calculation of clipping?
f= allowable sagging, ε= allowable strain, l= beam length, h= beam height, b= beam width, e= neutral line, W= cross section factor, E= Young's modulus, Q= assembly force
What are the different types of rivets discussed in the Gépelemek 1. presentation?
Robbanás explosion type, blind (pop) rivets, upset rivets, solid rivet, semitubular rivet, Blind side upset, countersunk flush rivet, closed end break-mandrel blind rivet
What are the different riveting patterns mentioned in the text?
Behind one another, Next to one another, Zig-zag pattern
What is the purpose of pins and dowel pins in detachable joints?
To attach, fix, guide, grip, centralize, secure, and locate elements
Study Notes
- Félgömbfejû, Süllyesztettfejû, Lencsefejû, Alcsony félgömbfejû szegecs are types of materials used in rivets and their heads.
- Gépelemek 1. presentation discusses various types of rivets and their uses.
- Rivets include: Gépelemek 1. robbanás explosion type, blind (pop) rivets, upset rivets, solid rivet, semitubular rivet, Blind side upset, countersunk flush rivet, closed end break-mandrel blind rivet.
- Rivets have main states of stress in construction: Gépelemek 1. wrong - upper construction is wrong due to load and stress state in the rivet is tension, lower construction is better due to shearing.
- Riveting patterns include: Behind one another, Next to one another, and Zig-zag pattern.
- Elastic "cushion" modell describes the effect of vertical load on the rivet pattern, which twists under the torque, resulting in a force on the rivet that is proportional to the displacement.
- Construction improvement includes satisfactory M good and M alakkal záró kötések.
- Pins and dowel pins are used in detachable joints to attach, fix, guide, grip, centralize, secure, and locate elements. Pin joints are fixated and do not allow movement. Standardized pins include: cylindrical, taper pins, Groove pins, Dowel pins, spring dowel pins.
- Clevis pins are used in rotational pivots and hinges and have an interference fitment in one element and clearance fitment in another. Clevis pins are standardized: standard dowel pin, clevis pin with cotter pin hole, headed clevis pin, and threaded clevis pin.
- State of stress of pins are shearing, bending, and bearing pressure. At interference fitted pins, shearing is major and at clearance fitted pins, bending is major.
- Calculation of clipping involves considering mechanical load in joint assembly and disassembly forces.
- Polymer clip joints use clips that go to a non-strain standstill position when the connecting parts have interference during assembly. Temporary strain is 3-5% maximum and permanent strain is 0-1% maximum.
- Calculation of clipping considers general considerations such as allowable sagging, allowable strain, beam length, beam height, beam width, neutral line, and cross section factor.
- Allowable strain values for regular clipping can be considered at calculations to be 60% of the values.
- Nomenclature for calculation of clipping includes: f= allowable sagging, ε= allowable strain, l= beam length, h= beam height, b= beam width, e= neutral line, W= cross section factor, E= Young's modulus, and Q= assembly force.
Test your knowledge of semi-detachable fasteners and their application in machine elements with this quiz. Topics covered include form closing principles, riveting processes, types of pins and dowel pins, polymer form closing, and clipping features such as cantilever beam and cylindrical joint.
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