Contact Interaction Calculators

Two Parallel Cylinders Contact

In this calculation, the contact of two parallel cylinders of length L, with diameters D₁ and D₂ is considered. Cylinder D₂ is under load F, which is transferred to cylinder D₁ through the contact zone. For the calculation, the elastic moduli E₁, E₂ and Poisson's ratios ν₁, ν₂ of the contacting cylinders should be specified.

Following the calculations, the contact stresses σ in the contact zone and width A of the contact zone are determined.

Two parallel cylinders contact

Two parallel cylinders contact

INITIAL DATA

D₁ - First cylinder diameter;

Е₁ - Young's modulus of the first cylinder;

ν₁ - Poisson's ratio of the first cylinder;

D₂ - Second cylinder diameter;

Е₂ - Young's modulus of the second cylinder;

ν₂ - Poisson's ratio of the second cylinder;

F - Load.

RESULTS DATA

σ - Stress at contact area ;

A - Width of contact area;

Metric Imperial

Cylinder diameter (D₁)

Young's modulus (Е₁)

Poisson ratio (ν₁)

Cylinder diameter (D₂)

Young's modulus (Е₂)

Poisson ratio (ν₂)

Length of cylinders (L)

Load (F)

Stress at contact area (σ)

Width of contact area (A)

BASIC FORMULAS

Stress at contact area:

σ = 0.6(FE / [(D₁D₂)/(D₁ + D₂)])^1/2;

Width of contact area:

A = 2.2(F[(D₁D₂)/(D₁ + D₂)] / E)^1/2;

*The above formulas are valid for equal material with ν = 0.3.

INITIAL DATA

D₁ - First cylinder diameter;

Е₁ - Young's modulus of the first cylinder;

ν₁ - Poisson's ratio of the first cylinder;

D₂ - Second cylinder diameter;

Е₂ - Young's modulus of the second cylinder;

ν₂ - Poisson's ratio of the second cylinder;

F - Load.

RESULTS DATA

σ - Stress at contact area ;

A - Width of contact area;

MATERIALS PROPERTIES

Material	Young’s modulus Pa (psi)	Poisson’s ratio
Steel	1.86÷2.1×10¹¹ (2.7÷3.05×10⁷)	0.25÷0.33
Cast iron	0.78÷1.47×10¹¹ (1.1÷2.1×10⁷)	0.23÷0.27
Copper	1.0÷1.3×10¹¹ (1.45÷1.9×10⁷)	0.34
Tin bronze	0.74÷1.22×10¹¹ (1.1÷1.8×10⁷)	0.32÷0.35
Brass	0.98÷1.08×10¹¹ (1.4÷1.6×10⁷)	0.32÷0.34
Aluminum alloy	0.7×10¹¹ (1.0×10⁷)	0.33
Magnesium alloy	0.4÷0.44×10¹¹ (5.8÷6.4×10⁶)	0.34
Nickel	2.5×10¹¹ (3.6×10⁷)	0.33
Titanium	1.16×10¹¹ (1.7×10⁷)	0.32
Lead	0.15÷0.2×10¹¹ (2.2÷2.9×10⁶)	0.42
Zinc	0.78×10¹¹ (1.1×10⁷)	0.27
Glass	4.9÷5.9×10¹⁰ (7.1÷8.5×10⁶)	0.24÷0.27
Concrete	1.48÷2.25×10¹⁰ (2.1÷3.3×10⁶)	0.16÷0.18
Wood (along the grain)	8.8÷15.7×10¹⁰ (12.8÷22.8×10⁶)	-
Wood (across the grain)	3.9÷9.8×10¹⁰ (5.7÷14.2×10⁶)	-
Nylon	1.03×10¹⁰ (1.5×10⁶)	-

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