Long fiber reinforced thermoplastic composite material multi-scale simulation method

A technology for enhancing thermoplastic and composite materials, applied in the direction of applying stable tension/pressure to test material strength, using radiation for material analysis, etc., and can solve problems such as difficult and accurate simulation of mechanical properties

Inactive Publication Date: 2017-11-17
JILIN UNIV
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  • Application Information

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Problems solved by technology

[0006] In order to solve the problem that the mechanical properties of long fiber reinforced thermoplastic composites are difficult to accurately simulate in the simulation due to the strain rate effect and anisotropy, the present invention provides a multi-scale simulation method for long fiber reinforced thermoplastic composites considering the strain rate effect

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  • Long fiber reinforced thermoplastic composite material multi-scale simulation method
  • Long fiber reinforced thermoplastic composite material multi-scale simulation method
  • Long fiber reinforced thermoplastic composite material multi-scale simulation method

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Embodiment

[0135] Next, the present invention introduces the process of utilizing the multi-scale simulation method for long fiber reinforced thermoplastic composite materials proposed by the present invention in combination with examples.

[0136] 1. Tensile test of LFRP plate under different strain rates in different directions

[0137] LFRP slabs are made of The thermoplastic matrix (PP) and long glass fibers are mixed and placed in a mold of 356mm*100mm*3mm by injection molding process, and the fiber mass fraction is 40%. The test samples (refer to the standard ISO527) were cut from multiple flat plates along the angles of 0°, 45° and 90° to the flow direction of the matrix, as figure 2 As shown, the center width is 5mm. In order to prevent the premature failure of the arc transition area of ​​the clamping part on the sample, the geometric dimensions of the sample were modified, and the radius of the transition arc was reduced from 30mm to 5mm, as shown in image 3 shown.

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Abstract

The invention discloses a long fiber reinforced thermoplastic composite material multi-scale simulation method to solve the problem of difficult accurate simulation of long fiber reinforced thermoplastic composite material in simulation because of strain rate effect and anisotropic mechanical properties. The method includes the steps of: 1. conducting tensile test on an LFRP plate under different directions and different strain rates; 2. performing x-ray CT scanning on an LFRP plate test area; and 3) carrying out multi-scale simulation verification on the LFRP plate: 1) viscoelastic-viscoplastic material model and failure; and 2) simulation verification: using ABAQUS software and Digimat software coupling to establish a simulation finite element model, conducting simulating calculation of tensile test under three strain rates, wherein 0.001s<-1> and 1s<-1> adopt implicit algorithm, and 100s<-1> adopts display algorithm; fixing one end of the finite element sample model, and applying load to the other end along the length direction, and comparing all the mechanical characteristic curves obtained by simulating calculation with test data.

Description

technical field [0001] The invention relates to a simulation method belonging to the research field of composite materials for automobiles, more precisely, the invention relates to a multi-scale simulation method for long fiber reinforced thermoplastic composite materials. Background technique [0002] The injection molding process, as the processing method of most LFRP (long fiber reinforced composite materials) automotive parts, is not only suitable for complex geometries and can integrate multiple components. During processing, the material exhibits anisotropic mechanical properties due to the distribution of fiber directions at different positions and thicknesses. Isotropic materials corrected by scaling factors are usually used in existing CAE simulations. In order to improve the design efficiency of LFRP and meet the structural crashworthiness requirements, it is necessary to study LFRP simulation methods with high precision and considering the strain rate effect to pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/08G01N23/04
Inventor 张君媛李仲玉张秋实姜哲房强倪滢滢刘茜纪梦雪王丹琦
Owner JILIN UNIV
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