Study on Mechanical Properties of Material Formed with Fused Deposition Molding Technology

doi:10.19491/j.issn.1001-9278.2021.06.011

Abstract

Abstract:

Based on the actual stress condition of a rectangular ring structure， the sample structure was firstly modeled in a 3D mode， and then the model was imported into the simulation software to complete the static analysis under different stress conditions. The equivalent stress and deformation cloud map of the sample was obtained， and the stress concentration area of the sample was determined. The test samples with different deposition angles were processed by a melt deposition molding method. Tensile tests were carried out on these samples. The experimental results indicated that when the direction of force and deposition angle was 45 °， the fracture strength increased by 63.80 % corresponding to 0 ° and 32.81 % corresponding to 90 °. The relationship between the forming process and the anisotropy of mechanical properties was obtained. This provides a reference for the material forming process under specific working conditions.

Key words: melt deposition, anisotropy, fracture strength, finite element simulation, the stress distribution

CLC Number:

TQ320.66

GUAN Tianmin, LI Yu, ZHAI Yun, LEI Lei. Study on Mechanical Properties of Material Formed with Fused Deposition Molding Technology[J]. China Plastics, 2021, 35(6): 68-73.

Figures/Tables 17

Fig.1. Diagram of FDM process manufacturing process

成型方式	拉伸强度/MPa	断裂伸长率/%
3D打印	42.2	10
注射成型	62	3.5

Tab.1. Tensile properties of PLA product［10］

成型方式	拉伸强度/MPa	拉伸模量/Pa
3D打印	95.55	3 746.40
注射成型	91.02	3 890.00

Tab.2. Tensile properties of PEEK product［11］

Fig.2. Rectangular ring

Fig.3. Rectangular ring three view and 3D model diagram

Fig.4. Model meshing

Fig.5. Model fixes the position where the constraint is applied

Fig.6. Model equivalent stress distribution and deformation nephogram

Fig.7. Different deposition patterns from different angles

Fig.8. Forth?displacement curve of PE?UHME rope

Fig.9. PE?UHMW rope and rectangular ring sample

Fig.10. Stress of rectangular ring during stretching

Fig.11. Simplified rectangular ring stress

Fig.12. Partial magnification of the model

Fig.13. Fracture shape diagram of sample

序号	角度/（°）	最大负荷/N	最大负荷平均值/N	断裂强度/MPa	断裂强度平均值/MPa	断裂强度的标准偏差	矩形环最大位移量/mm
1	0	166.60	170.53	13.88	14.21	0.43	0.13
2		176.40		14.70
3		168.60		14.05
4	45	282.24	279.33	23.52	23.28	0.69	0.23
5		286.00		23.83
6		270.00		22.50
7	90	196.00	210.33	16.33	17.53	1.06	0.19
8		214.40		17.87
9		220.60		18.38

Tab.3. Tensile test results

Fig.14. Stress?strain curve of rectangular ring sample

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