Large-Scale X-Ray Microtomography Analysis of Fiber Orientation in Weld Line of Short Glass Fiber Reinforced Thermoplastic and Related Elasticity Behavior

被引：13

作者：

Ayadi, Abderrahmane ^{[1
]}

Nouri, Hedi ^{[1
,2
]}

Guessasma, Sofiane ^{[3
]}

Roger, Frederic ^{[1
]}

机构：

[1] Mines Douai, Dept Polymers & Composites Technol & Mech Engn, 941 Rue Charles Bourseul,CS 10838, F-59508 Douai, France

[2] Ecole Natl Ingn Sfax, Lab Syst Electromecan, Route Soukra Km 3,BPW 3038, Sfax, Tunisia

[3] INRA, Res Unit, BIA, UR1268, Rue Geraudiere, F-44316 Nantes, France

来源：

MACROMOLECULAR MATERIALS AND ENGINEERING | 2016年 / 301卷 / 08期

关键词：

digital image correlation; full-scale finite element computation; X-ray computed tomography; weld line; DAMAGE MECHANISMS; TOMOGRAPHY; QUANTIFICATION; SIMULATION; PREDICTION; COMPOSITE; WELDLINES; POLYAMIDE; MODULUS; FAILURE;

D O I：

10.1002/mame.201500463

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Large-scale X-ray microcomputed tomography (mu-CT) is used to investigate microstructural features of weld lines in a short glass fiber reinforced polymer. The main originality of this work is related to the evaluation of local structural and mechanical characteristics in zones of unmastered heterogeneities. Complete and incomplete injection molded plates are considered to investigate weld lines with and without process-induced porosity. Using a helical scanning trajectory, the full 3D microstructure is obtained at centimetric scale to cover a large zone including first contact between colliding fronts at a voxel size of 3 mu m. Microstructure analyses show that weld line area is ill-ordered at the fiber and structure length scales. Near the first contact point, fiber orientations show the signature of vortexes, which mark the presence of repulsive forces. The presence of micrometric porosity is only confirmed in incomplete plates. mu-CT images are used as inputs to create a full-scale finite element model for assessing strain localization. Predicted principal strains are compared to digital image correlation measurements performed during uniaxial tensile tests. Full-scale modeling combined to 3D high-resolution imaging proves high potential to correlate local fiber heterogeneities with strain localization effects.

引用

页码：907 / 921

页数：15