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Construction method for dynamic shear constitutive model of fiber-reinforced composite material

A composite material, fiber reinforced technology, applied in the field of composite material mechanical properties research, can solve the problems of strong initial value dependence, imperfect fitting method, slow convergence speed, etc., to achieve clear mechanical meaning, ensure uniqueness and accuracy Effect

Active Publication Date: 2018-01-26
SOUTHEAST UNIV
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  • Application Information

AI Technical Summary

Problems solved by technology

At present, parameter fitting is mainly aimed at the fitting of a single curve, and the fitting method for multiple curves and some parameters in the curve are not perfect.
At the same time, in the process of multi-parameter fitting, it faces problems such as slow convergence speed, strong initial value dependence and easy local convergence.

Method used

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  • Construction method for dynamic shear constitutive model of fiber-reinforced composite material
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  • Construction method for dynamic shear constitutive model of fiber-reinforced composite material

Examples

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Embodiment

[0039] Example: such as figure 1 As shown, a method for constructing a dynamic shear constitutive model of fiber-reinforced composites with Weibull damage distribution includes the following steps:

[0040] Step 1: The present invention adopts a cylindrical C / C composite material test piece with a diameter of 8.95mm, and completes the quasi-static shear test on the bolt shear test device through the electronic universal testing machine and completes different loadings through the drop weight impact test system Impact shear experiments at speeds (1m / s, 5m / s, 10m / s), and record the load-displacement curve during the loading process, such as figure 2 shown.

[0041] Step 2: Use Weibull damage distribution to characterize the damage evolution process of C / C composites during loading, and use the standard linear solid model ( image 3 shown) to characterize the strain rate hardening effect of C / C composites, and combine the two to derive the load-displacement relationship of C / C...

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Abstract

The invention discloses a construction method for a dynamic shear constitutive model of a fiber-reinforced composite material. The method comprises the steps of 1, completing shear tests of the fiber-reinforced composite material under various strain rate loading working conditions to obtain a load-displacement curve under each working condition; 2, combining a Weibull damage model with a viscoelastic model to deduce a to-be-fitted load-displacement relation containing Weibull damage distribution; 3, constructing a multi-curve least-square objective function according to the load-displacementcurves and the load-displacement relation; 4, obtaining an initial value of a to-be-fitted parameter by use of a genetic algorithm, searching in the vicinity of the obtained initial value of the parameter through a trust-region method to finally obtain a high-precision parameter value and the determined load-displacement relation containing the Weibull damage distribution; and 5, deducing the dynamic shear constitutive model of the composite material containing the Weibull damage distribution according to a load-stress relation, a displacement-strain relation and the load-displacement relation. According to the construction method for the dynamic shear constitutive model of the fiber-reinforced composite material, a reliable basis can be provided for numerical simulation calculation of thefiber-reinforced composite material under the dynamic working conditions.

Description

technical field [0001] The invention belongs to the technical field of mechanical performance research of composite materials, in particular to a method for constructing a dynamic shear constitutive model of fiber-reinforced composite materials. Background technique [0002] Composite materials are widely used in the field of aerospace, and aircraft structures have been in service in dynamic environments for a long time. According to research, composite materials have obvious strain rate effects, that is, the strength and stiffness of materials change with the change of strain rate. Therefore, it is particularly important to study the mechanical properties of composite materials under dynamic loading conditions for the design of aircraft structures. At the same time, the dynamic constitutive model of composite materials is also an important prerequisite for finite element simulation. [0003] Currently, there are two methods for establishing a dynamic constitutive model. T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50G01N3/24
CPCG01N3/24G06F30/20G06F2113/26G06F2119/14G06F30/17G06F30/23
Inventor 费庆国郭飞王猛张培伟李彦斌
Owner SOUTHEAST UNIV
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