Aircraft Bulkhead Component - Structural Partition & Load Transfer

Product Specifications

Technical details and manufacturing context for Bulkhead

Definition

In aerospace structural components, a bulkhead is a critical transverse structural element that divides the fuselage or other major sections of an aircraft. It serves to maintain the structural integrity and shape of the airframe, transfer loads (such as aerodynamic forces, engine thrust, and landing gear loads) throughout the structure, and often provides firewalls or pressure barriers between compartments. Bulkheads are fundamental to the airframe's monocoque or semi-monocoque construction. They are typically fabricated from high-strength materials such as aluminum alloys (e.g., 7075, 2024), titanium alloys, or carbon fiber reinforced polymer (CFRP), depending on the specific structural and weight requirements. The design and manufacturing of bulkheads must adhere to stringent aerospace standards to ensure safety and performance. For instance, the material grade for aluminum bulkheads is often specified as 7075-T6, with ultimate tensile strength ranging from 510 to 570 MPa and yield strength from 430 to 480 MPa, as per ASTM E8. Thickness typically varies from 1.5 to 6.0 mm, and weight per bulkhead ranges from 2.5 to 15 kg, depending on size and load requirements. Operating temperature limits are -55 to 70 °C, and fatigue life is specified as 50,000 to 100,000 cycles at maximum stress amplitude, per ASTM E466. Tolerances for flatness and hole position are ±0.1 mm and ±0.05 mm, respectively, per ISO 2768. Surface treatment is typically anodized (Type II, Class 2, black) per MIL-A-8625, and corrosion resistance is verified by a 500-hour salt spray test per ASTM B117. Fire resistance is tested per FAR 25.853, with a vertical burn test requiring a minimum of 15 minutes. These parameters are reference ranges and must be confirmed for the specific aircraft model and application. Always verify model-specific values and standards with the legal manufacturer or supplier.

Working Principle

A bulkhead functions as a rigid, load-bearing wall or frame. It resists and redistributes compressive, tensile, and shear forces encountered during flight operations (e.g., pressurization, maneuvering, gusts). By connecting to longerons, stringers, and the skin, it helps maintain the fuselage's circular or elliptical cross-section, preventing buckling or deformation. In pressurized aircraft, bulkheads, particularly the forward and aft pressure bulkheads, contain the cabin pressure differential. The structural design must ensure that the bulkhead can transfer loads without exceeding material limits, and that it maintains its shape under varying thermal and mechanical stresses. Proper installation and maintenance are critical to preserve the integrity of the airframe.

Common Materials

Aluminum Alloy (e.g., 7075, 2024), Titanium Alloy, Carbon Fiber Reinforced Polymer (CFRP)

Technical Parameters

Parameter	Typical range	Notes & selection driver
Material Grade	7075-T6	High strength aluminum alloy for structural partsAMS 4124
Ultimate Tensile Strength	510–570 MPa	Minimum for 7075-T6ASTM E8
Yield Strength	430–480 MPa	Minimum for 7075-T6ASTM E8
Thickness	1.5–6.0 mm	Depends on structural load requirements
Weight	2.5–15 kg	Per bulkhead, varies with size
Operating Temperature	-55–70 °C	Aircraft environment limitsMIL-STD-810
Fatigue Life	50000–100000 cycles	At max stress amplitudeASTM E466
Flatness Tolerance	±0.1 mm	Critical for sealing surfacesISO 2768
Hole Position Tolerance	±0.05 mm	Ensures fastener alignmentISO 2768
Surface Treatment	Anodized	Type II, Class 2, blackMIL-A-8625
Corrosion Resistance	500 h	Salt spray test per specASTM B117
Fire Resistance	15 min	Vertical burn testFAR 25.853

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Web Part
The primary load-bearing plate or sheet of the bulkhead, forming its main surface.

Material: Aluminum Alloy / CFRP
Flange Part
A reinforced edge or rim for attachment to the fuselage skin, longerons, or adjacent structures.

Material: Aluminum Alloy / Titanium
Stiffener (Rib) Part
An attached or integral reinforcing member to prevent web buckling under load.

Material: Aluminum Alloy
Cutout Reinforcement Part
A locally reinforced area around openings for doors, windows, or systems pass-through.

Material: Aluminum Alloy / Titanium

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Bulkhead.

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Aerospace Structural Components

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Manufacturers of Bulkhead

Manufacturer profiles associated with Bulkhead.

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Frequently Asked Questions

What is the primary function of an aircraft bulkhead?

The primary function is to divide the fuselage or other sections, provide structural support, and transfer loads such as aerodynamic forces, engine thrust, and landing gear loads throughout the airframe.

What materials are commonly used for bulkheads?

Common materials include aluminum alloys (e.g., 7075, 2024), titanium alloys, and carbon fiber reinforced polymer (CFRP). The choice depends on structural and weight requirements.

What are typical thickness and weight ranges for a bulkhead?

Thickness typically ranges from 1.5 to 6.0 mm, and weight per bulkhead ranges from 2.5 to 15 kg, depending on size and load requirements. These are reference ranges and must be confirmed for the specific application.

How is the structural integrity of a bulkhead verified?

Verification involves testing for ultimate tensile strength, yield strength, fatigue life, and corrosion resistance per standards like ASTM E8, ASTM E466, and ASTM B117. Also, dimensional tolerances are checked per ISO 2768. Always confirm with the manufacturer.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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pressure:	Up to 50 psi differential pressure
other spec:	Structural load capacity: 10,000 lbf axial, 5,000 lbf shear
temperature:	-65°F to 350°F (-54°C to 177°C)

Bulkhead

Product Specifications

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