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A Dynamic Tensile Failure Evaluation Method for Fiber Reinforced Composite Materials

A technology of dynamic stretching and fiber reinforcement, applied in instrumentation, design optimization/simulation, calculation, etc., can solve problems such as lack of theoretical basis and failure to consider strain rate effects

Active Publication Date: 2019-03-12
SOUTHEAST UNIV
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Problems solved by technology

[0004] Purpose of the invention: The purpose of the present invention is to address the deficiencies of the prior art and provide a dynamic tensile failure evaluation method for fiber reinforced composite materials, which solves the problem that the current failure evaluation methods for fiber reinforced composite materials do not consider the strain rate effect and rely on test data. Correction of problems without theoretical basis

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  • A Dynamic Tensile Failure Evaluation Method for Fiber Reinforced Composite Materials
  • A Dynamic Tensile Failure Evaluation Method for Fiber Reinforced Composite Materials
  • A Dynamic Tensile Failure Evaluation Method for Fiber Reinforced Composite Materials

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Embodiment Construction

[0069] The technical solutions of the present invention will be described in detail below, but the protection scope of the present invention is not limited to the embodiments.

[0070] A method for evaluating dynamic tensile failure of fiber reinforced composite materials. Fiber reinforced composite laminates are selected as the analysis object, and the length, width and height of the specimen are 12.7mm×12.7mm×1mm. The material of the specimen is a fiber reinforced composite material with a fiber volume fraction of 50%, and its material parameters are shown in Table 1, where E 1 ,E 2 ,E 3 are the elastic modulus in the three main directions of the material, v 23 , v 13 , v 12 are the corresponding Poisson's ratios, respectively. Failure strain ε at different strain rates 1s and the failure stress σ 1s As shown in table 2.

[0071] Table 1 Parameters of fiber reinforced composites

[0072]

[0073] Table 2 Failure strain and failure stress of fiber reinforced compo...

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Abstract

The invention provides a dynamic stretching failure assessment method for a fiber reinforced composite material. For the problem of lack of a theoretical basis due to no consideration of a strain rateeffect and dependency on test data in correction in an existing fiber reinforced composite material failure assessment method, based on an energy density theory, the strain rate effect of the fiber reinforced composite material under the action of a dynamic load is considered, and derivation is performed to obtain a strain rate related distortion energy density equation of the material under theaction of the dynamic stretching load; the method can accurately analyze a stretching failure behavior of the fiber reinforced composite material under the action of the dynamic load; a large amount of dynamic tests are avoided; and the reliable assessment method is provided for design of various fiber reinforced composite structures.

Description

technical field [0001] The invention relates to a fiber-reinforced composite material, in particular to a method for evaluating dynamic tensile failure of a fiber-reinforced composite material. Background technique [0002] As a new type of material, fiber-reinforced composite materials are more and more widely used in aerospace, marine, automotive and other fields due to their excellent properties such as light specific gravity, high specific strength and corrosion resistance. The mechanical and physical properties of fiber-reinforced composite materials are relatively complex, and they have strain rate effects under dynamic loads, which greatly increases the difficulty of dynamic failure assessment of composite materials in structures. If the dynamic failure assessment of fiber-reinforced composite materials is not resolved, it will lead to blindness in the design and development of the structure and key technology research, which will have a fatal impact on the safety and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50
CPCG06F30/20G06F2119/06
Inventor 费庆国于静巍张培伟李彦斌郭飞陈强
Owner SOUTHEAST UNIV
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