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Construction Method of Polycarbonate Unified Constitutive Model Based on Tension and Compression Experiments

A technology of polycarbonate and constitutive model, which is applied in the direction of instruments, test material strength by applying repeated force/pulsation force, measuring device, etc., and can solve problems such as poor accuracy of constitutive model

Active Publication Date: 2019-03-26
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology

[0007] In order to overcome the shortcomings of the poor accuracy of the existing polycarbonate constitutive model construction methods, the present invention provides a construction method for polycarbonate unified constitutive models based on tension and compression experiments

Method used

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  • Construction Method of Polycarbonate Unified Constitutive Model Based on Tension and Compression Experiments
  • Construction Method of Polycarbonate Unified Constitutive Model Based on Tension and Compression Experiments
  • Construction Method of Polycarbonate Unified Constitutive Model Based on Tension and Compression Experiments

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Embodiment Construction

[0029] refer to Figure 1-5 . The concrete steps of the construction method of the polycarbonate unified constitutive model based on tensile and compression experiments of the present invention are as follows:

[0030] The tensile and compressive parameters in the unified constitutive model are not the same, but because the test methods and parameter determination methods are consistent, the following is only for polycarbonate at different temperatures (-60-120°C) and different strain rates (0.0005s -1 , 0.001s -1 , 0.01s -1 , 0.1s -1 , 1400s -1 , 2000s -1 , 3500s -1 , 4500s -1 ) from the test data obtained from the tensile test, and the relevant parameters were fitted, and the calculated results were compared and verified with the real test results.

[0031] Step 1: Through the quasi-static uniaxial tensile test, the current conditions (25°C, 0.01s -1 ) under the true stress-strain curve of polycarbonate, calculate its elastic modulus according to the data of its lin...

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Abstract

The invention discloses a construction method of a polycarbonate uniform constitutive model based on tensile tests and compression tests, and aims to solve the technical problem that the accuracy of a constitutive model established by a conventional construction method is low. According to the construction method, through the description of the linear elastic phase, yield phase, strain softening phase, and strain hardening phase of polycarbonate, a large amount of tensile tests and compression tests under different strain rates and temperatures and massive loading / unloading tests are carried out to determine the related parameters of a material model under real stress-strain, especially, through the loading / unloading tests, the influence of the inner damage of the material on the mechanical properties is written into the constitutive model, the parameters of the model are reasonably optimized, the number of the parameters is reduced, at the same time, the accuracy of the constitutive model is guaranteed, and at the same time, the tensile constitutive model and the compression constitutive model are effectively unified and combined.

Description

technical field [0001] The invention relates to a construction method of a polycarbonate constitutive model, in particular to a construction method of a polycarbonate unified constitutive model based on tension and compression experiments. Background technique [0002] As a typical thermoplastic amorphous polymer, polycarbonate (PC) is widely used in aerospace, automobile, high-speed rail and construction due to its good impact resistance, high specific stiffness, specific strength and light transmission performance. field. Since the service environment of polycarbonate products such as aerospace and high-speed rail includes harsh service conditions such as high temperature difference, high-speed impact, and large pressure difference, there are high requirements for the mechanical properties of polycarbonate. It can not only play its role in various fields, but also replace some experiments with numerical simulation to greatly reduce the manufacturing cost of the industry a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/32
CPCG01N3/32G01N2203/0005G01N2203/0017G01N2203/0019G01N2203/0075
Inventor 许英杰高腾龙张卫红
Owner NORTHWESTERN POLYTECHNICAL UNIV
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