Experimental and computational analysis of failure mechanisms in unidirectional carbon fiber reinforced polymer laminates under longitudinal compression loading
| Autor: | Xuming Su, Guowei Zhou, Zhaoxu Meng, Qingping Sun, Haiding Guo, Zhangxing Chen, Hong Tae Kang, Sinan Keten |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Carbon fiber reinforced polymer
Materials science Waviness Micromechanics 02 engineering and technology 021001 nanoscience & nanotechnology Compression (physics) law.invention 020303 mechanical engineering & transports 0203 mechanical engineering Optical microscope Consistency (statistics) law Ceramics and Composites lipids (amino acids peptides and proteins) Fiber Computational analysis Composite material 0210 nano-technology Civil and Structural Engineering |
| Zdroj: | Composite Structures. 203:335-348 |
| ISSN: | 0263-8223 |
| DOI: | 10.1016/j.compstruct.2018.06.028 |
| Popis: | This study investigates the failure mechanisms of notched unidirectional (UD) carbon fiber reinforced polymer (CFRP) laminates subjected to longitudinal compressive loading . A sequence of failure initiation and propagation is observed based on optical microscopy images of specimens during failure. The micrographs reveal that the main failure mechanism in UD laminates is fiber kinking failure. The influence of manufacturing defects and voids on fiber kinking mechanisms is also analyzed. The results show that the voids in the resin-rich area lead to kink-band splitting, while in some cases the voids cause the kink-band to deflect in a new direction depending on the location of the voids. The next focus of this study is to propose a computational micromechanics model considering local fiber waviness to study the fiber kinking failure mechanism. The computational results on kink-band formation and stress-strain response show good consistency with our experimental analysis. Finally, the failure envelopes of σ11-σ22 and σ11-τ12 subjected to combined loading conditions are obtained from the computational model, which provide essential inputs for future theoretical failure criteria. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect