How does the molding process affect the internal structure and properties of composites?

Different molding processes can significantly affect the internal structure and properties of composites by influencing fiber distribution, porosity, resin curing degree, etc. The following is a specific analysis of several common molding processes:

Fiber entanglement molding process

● Internal structure

Regular distribution of fibers: Fibers are accurately laid according to the predetermined angles and paths during the winding process, which can ensure the uniform distribution of fibers in the circumferential and axial directions, and the spacing between fibers is more consistent, forming an orderly fiber arrangement structure.

Low porosity: During the winding process, the fiber bundles are closely arranged, while the resin fully penetrates between the fibers, bonding the fibers together and effectively filling the void between the fibers, making the composite material made of low porosity.

● Performance

High strength and stiffness: due to the uniform distribution of fibers and can give full play to its load-bearing capacity, the composite material in the direction of the fibers has high strength and stiffness, can withstand large tensile and compressive loads, suitable for the manufacture of high-pressure pressure vessels and other structures.

Good fatigue resistance: The regular fiber structure and low porosity make the composite material more stable under cyclic load, and the combination between fiber and resin is good, which can effectively resist the emergence and expansion of fatigue cracks, so it has good fatigue resistance.