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Whole-process analysis method of impact damage and residual strength of seamed composites

A composite material and impact damage technology, which is applied in the whole analysis of impact damage and residual strength of sutured composite materials, and the analysis of damage performance of sutured composite materials, can solve the problems of low engineering application prospects, no consideration, and little improvement in accuracy. Achieve the effect of good scalability, high coherence, and improved accuracy

Active Publication Date: 2021-07-23
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method does not take into account the actual damage type and damage degree of the composite material structure after impact, and only predicts the damage area, that is, the impact damage itself is simplified to a certain extent, so the accuracy of the prediction results is not much improved. , its engineering application prospect is not high

Method used

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  • Whole-process analysis method of impact damage and residual strength of seamed composites
  • Whole-process analysis method of impact damage and residual strength of seamed composites
  • Whole-process analysis method of impact damage and residual strength of seamed composites

Examples

Experimental program
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Embodiment

[0110] Example: G0827 / QY9512 Seamed Composite Laminate Impact Damage and Residual Strength Analysis

[0111] according to figure 1 The flow chart shown is a full-scale analysis of the impact damage and residual strength of G0827 / QY9512 stitched composite laminates, as follows:

[0112] (1) The geometric model parameters and material performance parameters of the impact process;

[0113] The stitching density of G0827 / QY9512 stitched composite laminates is 5mm×5mm; the stitching is kevlar29 (1500 denier); the stitching method is improved lock stitching, the stitching direction is 0°, and the thickness of each layer of the single-layer board is 0.15mm. The punch is a smooth ball punch with a diameter of 16mm and a hardness greater than 60HRC, and the weight of the punch is 5.5kg.

[0114] G0827 / QY9512 Mechanical properties of seamed composite laminates: longitudinal tensile modulus E 1 =128GPa; transverse tensile modulus E 2 =9.93GPa; normal tensile modulus E 3 =9.93GPa; in...

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Abstract

The invention discloses a whole-process analysis method for impact damage and residual strength of a stitched composite material, comprising the following steps: (1) transient stress analysis of the stitched composite material under impact load; (2) determination of the impact damage criterion of the stitched composite material (3) Determination of mechanical properties degradation method of sutured composite material impact damage; (4) Static analysis of sutured composite material; (5) Determination of residual strength damage criterion of sutured composite material; (6) Determining the material of sutured composite material Performance degradation method; (7) Determination of structural failure criteria for stitched composites. The invention provides a comprehensive analysis method for impact damage and residual strength after impact, which not only considers the actual damage type and damage degree of the composite material structure after impact, but also does not need to observe impact damage to improve the residual strength. Therefore, the method of the present invention has high coherence, good expansibility, high prediction accuracy, and has considerable engineering application prospects.

Description

Technical field: [0001] The invention relates to a method for analyzing the damage performance of a suture composite material, in particular to a method for analyzing the impact damage and residual strength of a suture composite material throughout the whole process, and belongs to the technical field of composite material performance analysis. Background technique: [0002] Composite structures are vulnerable to low-speed impact accidents such as tool drop and equipment impact during use, which will cause varying degrees of internal damage and affect their service safety. The degree of damage after impact and the remaining strength after impact can be used to accurately evaluate its subsequent service. [0003] Due to its excellent interlaminar mechanical properties, seamed composites have been widely used in engineering, and the prediction analysis of their damage and residual strength after low-velocity impact has also attracted increasing attention of researchers. At pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/23G06F113/26G06F119/14
CPCG06F30/20G06F2119/06
Inventor 张宏建郭俊华陈津博徐颖温卫东崔海涛
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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