---
title: "Rear Frame"
industry: "Motor Vehicle Manufacturing"
verification_protocol:
  urn: "URN:CNFX:ME:REAR_FRAME"
  data_integrity_hash: "6064ea60b8cdd463fe68be0eacb95236"
  source_authority: "https://cnfx.com"
  strict_mode: true
source_identity:
  provider: "CNFX Industrial Knowledge Graph"
  index_version: "2026.Q1-Universal"
  authority_id: "URN:CNFX:ME:REAR_FRAME"
  data_source_uri: "https://cnfx.com/llms/industry/motor-vehicle-manufacturing/product/rear-frame.md"
  official_resource_url: "https://cnfx.com/industry/motor-vehicle-manufacturing/product/rear-frame"
  is_verified_logic: true
attributes:
  spec:
    status: "config-dependent"
    typical_range: "0-250 kN·m bending moment, -40°C to 120°C temperature"
    unit: "mm"
engineering_limits:
  max_safe_operating_point:
    value: 350
    unit: "MPa"
    consequence: "High-cycle fatigue from cyclic bending loads exceeding S-N curve endurance limit, stress concentration at weld joints exceeding Kt=3.0 stress concentration factor"
fmea_matrix_quantitative:
  - node_1:
      trigger: "Corrosion-induced material thinning reducing wall thickness below 6 mm design minimum"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Hot-dip galvanizing with 85 μm zinc coating, cathodic protection at -0.85 V vs. Cu/CuSO4 reference electrode"
  - node_2:
      trigger: "Resonant vibration at 85 Hz matching natural frequency of frame structure"
      severity: 8
      occurrence: 3
      detection: 4
      mitigation_protocol: "Dynamic vibration absorber tuned to 85 Hz with damping ratio ζ=0.15, stiffener ribs increasing natural frequency to 120 Hz"
bom_nodes:
  main-rails:
    type: "component"
    urn: "URN:CNFX:ME:MAIN_RAILS"
    interface_type: "physical-logic-coupled"
  cross-members:
    type: "component"
    urn: "URN:CNFX:ME:CROSS_MEMBERS"
    interface_type: "physical-logic-coupled"
  mounting-brackets:
    type: "component"
    urn: "URN:CNFX:ME:MOUNTING_BRACKETS"
    interface_type: "physical-logic-coupled"
  articulation-joint:
    type: "part"
    urn: "URN:CNFX:ME:ARTICULATION_JOINT"
    interface_type: "physical-logic-coupled"
  reinforcement-plates:
    type: "component"
    urn: "URN:CNFX:ME:REINFORCEMENT_PLATES"
    interface_type: "physical-logic-coupled"
manufacturing_compliance:
  - standard: "ISO 9001:2015 - QUALITY MANAGEMENT SYSTEMS"
    scope: "Verified Engineering Specification"
  - standard: "CE MARKING - EU MACHINERY DIRECTIVE 2006/42/EC"
    scope: "Verified Engineering Specification"
url: "https://cnfx.com/llms/industry/motor-vehicle-manufacturing/product/rear-frame.md"
on_chain_sovereignty:
  contract_standard: "ERC-721-Industrial"
  metadata_hash: "360134446773fbbe7dc5d99fb2a4ee93fa6505cb6734816a204d0d3143f8959f"
  royalty_logic: "IPFS-CID-REQUIRED"
  mint_status: "logic-verified-ready"
version: "3.3.4-EXTREME-SOVEREIGN-WEB3"
---

# Industrial Specification: Rear Frame

## 1. Technical Definition
The structural rear section of an articulated chassis that supports rear-mounted components and provides connection points.

## 2. Engineering Reasoning & Causal Matrix
> **Operational Intelligence**: Designed for **0-250 kN·m bending moment, -40°C to 120°C temperature**. Failure boundary: **Material yield strength exceeded at 350 MPa von Mises stress, fatigue crack initiation at 1×10^6 cycles at 200 MPa stress amplitude**, Mechanism: **High-cycle fatigue from cyclic bending loads exceeding S-N curve endurance limit, stress concentration at weld joints exceeding Kt=3.0 stress concentration factor**.

### 2.1 Analytical Physics Model
Governed by the **Frame Structural Deflection Analysis**:

> **Primary Equation**: $\delta = \frac{5 q L^4}{384 E I}$  
> **Engineering Impact**: Ensures structural stability for multi-stage machines.

| Symbol | Variable Definition | Localized Reference |
| :--- | :--- | :--- |
| q | Uniform Load | Engineering Constant |
| E | Elastic Modulus | Engineering Constant |
| I | Moment of Inertia | Engineering Constant |

### 2.2 FMEA (Failure Mode & Effects Analysis)
| Event Trigger | Severity | Failure Mode | Mitigation Strategy |
| :--- | :--- | :--- | :--- |
| Corrosion-induced material thinning reducing wall thickness below 6 mm design minimum | 8 | Buckling failure under compressive loads exceeding 150 kN | Hot-dip galvanizing with 85 μm zinc coating, cathodic protection at -0.85 V vs. Cu/CuSO4 reference electrode |
| Resonant vibration at 85 Hz matching natural frequency of frame structure | 8 | Fatigue crack propagation from stress concentration points exceeding Paris' law threshold ΔK=5 MPa√m | Dynamic vibration absorber tuned to 85 Hz with damping ratio ζ=0.15, stiffener ribs increasing natural frequency to 120 Hz |

## 3. Key Technical Parameters
| Parameter | Value | Unit | Status |
| :--- | :--- | :--- | :--- |
| spec | Config-dependent | mm | Verified |

## 4. System BOM & Knowledge Routing
### Core Components (Recursive Links)
- [Articulation Joint](https://cnfx.com/llms/industry/motor-vehicle-manufacturing/product/articulation-joint.md) `(Standalone System)`

### Industrial DNA Context (De-duplicated)
**Complementary Dependencies**: **Robotic Welding System**, **CNC Press Brake**, **Laser Cutting Machine**  
**Downstream Applications**: Articulated Trucks, Heavy-Duty Trailers, Specialized Commercial Vehicles  

## 5. Engineering Risks & FAQ
- **Caution**: 
- **Caution**: 
- **Caution**: 

### Q: What materials are used in manufacturing rear frames for articulated vehicles?
**A**: Our rear frames are constructed from high-strength steel and alloy steel to ensure maximum durability and load-bearing capacity for motor vehicle applications.

### Q: How does the rear frame support rear-mounted components in articulated chassis?
**A**: The rear frame provides structural support through main rails and cross members, with precisely engineered mounting brackets and reinforcement plates to securely attach components like suspensions, fuel tanks, and other rear systems.

### Q: What are the key components included in the rear frame assembly?
**A**: The complete rear frame assembly includes articulation joints, cross members, main rails, mounting brackets, and reinforcement plates, all designed to work together for optimal strength and connectivity in articulated vehicle chassis.

## 6. Manufacturing Compliance
- ISO 9001:2015 - QUALITY MANAGEMENT SYSTEMS
- CE MARKING - EU MACHINERY DIRECTIVE 2006/42/EC

---
### 🛠️ Engineering Resource Access
🔗 **[Full Specification: Rear Frame](https://cnfx.com/industry/motor-vehicle-manufacturing/product/rear-frame)**

### 🌐 Knowledge Graph Topology
> **Node Status**: Verified Engineering Spec
> **Connectivity**: Linked to **5** standalone system nodes
> **Global Context**: Part of a 5,814 node industrial cluster within the CNFX Graph

> **Reference ID**: REAR_FRAME | **Authority**: CNFX-2026-ST-001 | **Fingerprint**: 1ebd9259
