GB/T 38928-2020 in English

VALID

Manufacturing data definition of civil aircraft composite part design model

Issued on:2020-06-02
Implemented on:2020-12-01
File Format:PDF
Delivery:Via email within 1~3 business days

Price(USD)： $150.00
$146.00

Standard No:	GB/T 38928-2020
Document status:	VALID
Title in English:	Manufacturing data definition of civil aircraft composite part design model
Title in Chinese:	民用飞机复合材料设计模型制造数据定义
Language:	English
File Format:	Electronic (PDF)
Delivery:	Via email within 1~3 business days
Issued on:	2020-06-02
Implemented on:	2020-12-01
ICS Classification:	49.020-Aircraft and space vehicles in general
Chinese Classification:	V07-Computer application
Professional Classification:	GB-National Standard
Related Topics:	material design Civil composite material test Production of Civil Composite Materials Civil composite material testing Test Data Definition material design material model data+repeated hole+ data definition GBT38928 GB/T 38928-2020 Equipment for aircraft manufacturing composite material Medical molding materials Xifei composite material preparation Composite material manufacturing industry Civil aircraft strength design

《GB/T 38928-2020民用飞机复合材料设计模型制造数据定义》由TC435（全国航空器标准化技术委员会）归口，主管部门为国家标准化管理委员会。

Introduction

Interpretation of the core content of the standard

GB/T38928-2020 standard establishes a complete technical framework from composite material design model to manufacturing data, focusing on standardizing the three major links of manufacturing model generation → analysis → storage. The standard is applicable to the manufacturing of aviation composite parts using automatic unloading and manual laying processes.

Key technical requirements

Technical links	Core content	Implementation points
Manufacturing model generation	4 surface conversion methods: 1. Projection conversion 2. Translation conversion 3. Unfolding conversion 4. Envelope curve conversion	Manufacturing constraints such as springback effect and cutting edge need to be considered. The boundary extension from EEOP to MEOP needs to reserve 3-5mm process allowance
Manufacturing model analysis	• Exploded view generation • Layup property calculation • Layup stack scanning	The recommended scale for the exploded view is 1:1~1:5. The layup information should include 12 parameters such as material grade and fiber orientation angle.
Data storage	• Independent model storage • Keep linked to the design model • MDM system integration	It is recommended to use the CPD module of CATIA V5. The file version needs to be updated synchronously with the PDM system.

Typical application case

In the manufacturing of a certain type of aircraft skin, when projection transformation is used to process the layup in the double curvature area:

Orthogonally project the KEVLAR4 layup of the design surface to the manufacturing surface
Through the exploded view of the laminate, three risk points of fiber wrinkles were found
After the envelope curve conversion optimization, the material utilization rate increased by 15%

The laminate information table provided in Appendix A of the standard shows that the skin contains 33 layers, involving four types of materials such as carbon fiber and glass fiber.

Implementation Suggestions

Data Connection Management

Establish a design-manufacturing data traceability matrix to ensure that EEOP changes are synchronized to MEOP
The MDM system should record all surface conversion parameters and keep version difference records

Key Points for Process Verification

Ply sampling and analysis must be carried out in areas with a radius of curvature <50mm
During flattening, the fiber orientation angle deviation should be controlled within ±2°

Technology Evolution Analysis

The main improvements of this standard compared to the old version GB/T38927 are:

Added Envelope curve conversion method to solve the problem of ply positioning in large deformation areas
Clear MDM system data storage structure to support manufacturing process traceability
Introduce quantitative evaluation indicators for ply flatness

More samples: DL/T 368-2010 YD/T 3934-2021 NB/T 47013.2-2015

Sample only — not a preview of GB/T 38928-2020