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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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

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

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Example Embodiment

[0061] Example 1: Numerical simulation of high-speed impact experiments using finite element software, set material constitutive model and model parameters, analog test piece unidirectional high-speed impact loading, derived a strain field, strain rate field, and strain rate field and Acceleration field simulation data, will simulate data into the modified elastic constant dynamic virtue Characterization procedures, based on the analog data identification of the orthogonistic elastic constant, compare the reference value of the parameter characterization with the input model, verify the accuracy of the method.

[0062] Step 1: Design a high-speed impact loading system of the shaped test piece, in finite element software The rectangular plate is removed from the rectangular plate, so that the test piece obtains a gap and corner and other structural characteristics. The test piece can simultaneously generate significant positive strain and shear strain at the high-speed impact of ...

Example Embodiment

[0100] Example 2: The orthogonitial elastic constant duct field synchronization characterization of the high-speed impact based on the high-speed impact of the heterogeneous member is a long fiber reinforced resin matrix composite material; the present embodiment is different from the first embodiment in that the long fiber reinforced resin group composite material test The variant field under high speed impact conditions, its corresponding strain field, strain rate field and acceleration field are obtained by ultra-high-speed imaging systems and digital image related operations, other steps, such as test piece configuration, loading process, data generation, virtual Field selection, program calculation, etc. is the same as in Example 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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