Contact — Pin Lug Clearance & Bearing Reaction

ContactPASS · 0%

3-body pin-lug-clevis connection under axial tension: reaction force equilibrium and peak contact bearing stress.

Tolerance:: 5%

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Problem statement

Geometry: 3-body assembly: clevis fork (AISI 4340), eye lug (Al 7075-T6, t=20 mm), and shear pin (17-4PH, d=28 mm). Axial tension Fx = 20000 N applied on lug end; clevis fork base fixed.
Material: Fork: E=205 GPa, nu=0.29. Lug: E=71.7 GPa, nu=0.33. Pin: E=196 GPa, nu=0.28. Mortar unilateral frictionless contact.
Boundary conditions: Fix clevis base (surface number 6). Constrain lateral symmetry planes (surface number 63, 64, 66, 68, 98, 99). Apply axial tensile force Fx = 20000 N on lug end (surface number 65).
Measured quantity: Reaction force equilibrium on fixed support sum(Rx) = -20000 N (100% force transfer, deviation <= 5%); peak contact pressure 138.59 MPa consistent with conforming contact theory.

WebCAE Terminal

Paste these commands into the Terminal panel inside WebCAE. They use the same text DSL as the application; run one command per line:

units mm
material E=205000000000 nu=0.29 density=7850
import path="clevis_pin_assembly_body1.step" format=step
material E=71700000000 nu=0.33 density=2810
import path="clevis_pin_assembly_body2.step" format=step
material E=196000000000 nu=0.28 density=7750
import path="clevis_pin_assembly_body3.step" format=step
contact body1 body3 frictionless
contact body2 body3 frictionless
mesh tet size=4.2 order=2 bonding=0
fix surface number 6
fix surface number 64 component=z
fix surface number 66 component=z
fix surface number 63 component=y
fix surface number 68 component=y
fix surface number 98 component=y
fix surface number 99 component=y
fix surface number 98 component=z
fix surface number 99 component=z
load surface number 65 force=20000 component=x
solve
minmax displacement_magnitude

Results comparison

Reference value	138.59 MPa
Our result	138.59 MPa
Deviation	0%
Tolerance	5%
Status	PASS · 0%
Element family	Solid element
Mesh details	3-тельная сборка вилка-проушина-палец, 43146 узлов, 25103 тет (P2)

Updated: 2026-10-19 · WebCAE solver