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Synchronous characterization method for orthotropic elastic constant virtual field of high-speed impact special-shaped piece

A high-speed impact, orthotropic technology, applied in the direction of strength characteristics, measuring devices, instruments, etc., can solve problems such as difficulty in ensuring the global and accurate representation of anisotropic parameters, and achieve the goal of improving flexibility, simplifying experimental equipment, and breaking through conditional constraints Effect

Pending Publication Date: 2021-03-26
NORTHWESTERN POLYTECHNICAL UNIV +1
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  • Description
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  • Application Information

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Problems solved by technology

Although the above method realizes the accurate identification of isotropic elastic constants under dynamic conditions, for anisotropic elastic constants, the characterization accuracy is significantly affected by the stress-strain state of the specimen, and it is difficult to guarantee the impact loading method of equal-section specimens. Globally accurate characterization of anisotropy parameters

Method used

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  • Synchronous characterization method for orthotropic elastic constant virtual field of high-speed impact special-shaped piece
  • Synchronous characterization method for orthotropic elastic constant virtual field of high-speed impact special-shaped piece
  • Synchronous characterization method for orthotropic elastic constant virtual field of high-speed impact special-shaped piece

Examples

Experimental program
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Effect test

Embodiment 1

[0061] Example 1: Using finite element software to carry out numerical simulation of high-speed impact experiments, setting material constitutive model and model parameters, simulating one-way high-speed impact loading of specimens, and deriving the strain field, strain rate field and Acceleration field simulation data, substitute the simulation data into the anisotropic elastic constant dynamic virtual field The characterization program identifies the orthotropic elastic constants based on the simulated data, and compares the parameter characterization results with the reference values ​​input into the model to verify the accuracy of the method.

[0062] Step 1: Design the high-speed impact loading configuration of special-shaped specimens in the finite element software Part of the material is removed from the rectangular plate, so that the specimen can obtain structural features such as notches and corners. Under the high-speed impact of bullets, the specimen can produce s...

Embodiment 2

[0100] Example 2: Experimental method for synchronous characterization of orthotropic elastic constant virtual field based on high-speed impact of special-shaped parts, the selected material is long fiber reinforced resin matrix composite material; the difference between this example and Example 1 is that the long fiber reinforced resin matrix composite material is tested The deformation field and its corresponding strain field, strain rate field and acceleration field under the condition of high-speed impact of the workpiece are obtained by ultra-high-speed imaging system and digital image correlation operation. Other steps, such as specimen configuration, loading process, data substitution, virtual Field selection, program operation, etc. are the same as those in Embodiment 1.

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Abstract

The invention relates to a synchronous characterization method for an orthotropic elastic constant virtual field of a high-speed impact special-shaped piece. The synchronous characterization method comprises the following steps of: designing a proper special-shaped piece high-speed impact loading configuration to ensure that a test piece can generate balanced positive strain and shear strain undera one-way impact condition, and establishing a dynamic virtual field identification algorithm of an orthotropic elastic parameter; synchronously and accurately identifying all parameters of the orthotropic elasticity from a plurality of impact loading moments by adopting a least square global optimization method. Compared with the prior art, the method is not limited by one-dimensional stress waves and uniform deformation state assumed conditions, multi-parameter global representation of the orthotropic elasticity can be achieved only through one-time direct impact of bullets and acquisitionof a high-speed deformation field of a test piece, the number of experiments can be reduced to the maximum extent, and meanwhile, a huge bar system in a Hopkinson bar method is not needed, and an experimental device is simplified.

Description

technical field [0001] The invention belongs to a method for characterization of dynamic mechanical properties of materials, and relates to a virtual field synchronization method for orthotropic elastic constants of special-shaped parts subjected to high-speed impact, in particular to a multi-parameter synchronization of orthotropic elastic properties of materials under high-speed impact based on a dynamic virtual field method Characterization method. Background technique [0002] In the fields of aviation, aerospace, weapons, etc., aircrafts, armored vehicles and other equipment are often subjected to high-speed impacts from birds, shrapnel, shock waves and other foreign objects. Closely related. The dynamic mechanical properties of materials are usually significantly different from those under quasi-static conditions, which directly affects the service safety of equipment. At the same time, advanced structural materials such as fiber-reinforced composite materials and al...

Claims

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Application Information

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IPC IPC(8): G01N3/313G01N3/02
CPCG01N3/313G01N3/02G01N2203/0075G01N2203/0676G01N2203/0682Y02T90/00
Inventor 付佳伟齐乐华聂祥樊朱开宇汤毓源
Owner NORTHWESTERN POLYTECHNICAL UNIV
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