Abstract
Injection molding after compression (IMAC) is used for manufacturing the bi-material structure. However, the bi-material interface may be the weakest region restricting overall structural performance. Various specimens with discontinuous GF30/PA66 or GF30/PA6 over-molded injection on a continuous CF/PA6 sheet are prepared using the IMAC process. The interfacial shear and cross-tension tensile strength, mode-I/II fracture energy, and overall bending strength are then systematically characterized. The influence interlock features derived from sandpaper grinding, sandblasting, and nano-coating have on the properties are then investigated. It is found that decreasing interface roughness can improve interfacial tensile strength and mode-I fracture energy while weakening shear strength and mode-II fracture energy. These surface pretreatments are also effective for the promotion of overall bending strength. A design matching principle between the material, process, geometry, and properties is ultimately proposed. This work provides the fundamental interfacial properties of IMAC structures for engineering applications.
| Original language | English |
|---|---|
| Article number | 116740 |
| Journal | Composite Structures |
| Volume | 309 |
| DOIs | |
| State | Published - 1 Apr 2023 |
Keywords
- Bi-material interface
- Injection molding after compression
- Interfacial properties
- Test
- Thermoplastic composites
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