Method for establishing energy absorption model of long fiber reinforced thermoplastic composite material
A technology that enhances thermoplasticity and energy absorption. It is applied in the direction of analyzing materials, strength characteristics, and measuring devices. It can solve the problems of less research on LFT, meet the requirements of crash resistance and lightweight, and realize the effect of initial material design or selection.
Inactive Publication Date: 2018-11-20
JILIN UNIV
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However, most of the above studies have focused on the composite materials of the laminated plate structure, and less research on LFT
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[0103] Next, the present invention introduces the process of using the long fiber reinforced thermoplastic composite material energy absorption model establishment method proposed by the present invention in combination with examples.
[0104] 1. Establish a drop hammer impact calculation model with different thicknesses and mass fractions
[0105] Select plate thickness t including 2mm, 3mm and 4mm, mass fraction ω include 20%, 30% and 40%, combine 3 groups of thicknesses and 3 groups of mass fractions to establish 9 forms of LFT plates, and calculate 6 kinds of drop weights for each plate The simulation model under the impact speed, and ensure that the drop hammer rebounds in 2 models, and the drop hammer penetrates the flat plate in the other 4 models, and set the drop hammer quality in the multi-scale coupling finite element simulation model of low-speed drop hammer impact The initial impact velocity of the falling hammer is set within the range of 1m / s-30m / s, and the grav...
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The invention relates to the research field of composite materials for automobiles and relates to a method for establishing an energy absorption model of a long fiber reinforced thermoplastic composite material. The method comprises the steps of (1) establishing a drop hammer impact calculation model of different thicknesses and mass fraction, (2) studying energy absorption characteristics of an LFT plate during the springback of a drop hammer, (3) carrying out nonlinear fitting on LFT plates with different fiber mass fractions and different thicknesses to obtain a critical penetration speed and a minimum penetration energy of the drop hammer, (4) establishing an energy absorption analysis model, (5) verifying the energy absorption analysis model. According to the method, the strain rate effect of the composite material is considered, the critical penetration speed and the minimum penetration energy of the plate are obtained by fitting, an analysis model characterizing the relationshipbetween impact energy and absorbed energy is established by taking the minimum penetration energy as a normalized parameter, and the energy absorption amounts of the composite material under different working conditions are predicted.
Description
technical field [0001] The invention relates to a method for establishing an energy absorption model belonging to the research field of composite materials for automobiles, more precisely, the invention relates to a method for establishing an energy absorption model of a long fiber reinforced composite thermoplastic composite material. Background technique [0002] Long Fiber Reinforced Thermoplastics (LFT for short) have been applied in automotive structures due to their advantages of high specific stiffness and easy molding. Although finite element simulations can predict energy changes during a crash, they cannot guide structural design. [0003] The research on the impact characteristics of composite materials mainly includes the residual bearing capacity of the structure and the energy absorption capacity of the structure after the impact. At present, scholars have conducted research on penetrating energy. Caprinoet.al proposed an empirical relationship describing the...
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IPC IPC(8): G06F17/50G01N3/303
CPCG01N3/303G01N2203/0039G06F30/23
Inventor 张君媛李仲玉张秋实姜哲纪梦雪郭强王丹琦周浩陆炳全
Owner JILIN UNIV