SMC Sheet Intermediate Fiber Layer Bending Strength Uniformity
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Solution Overview
Problem
Conventional SMC sheets exhibit significant differences in bending strength between central and peripheral parts due to material flow during press forming, resulting in poor stiffness and a propensity for brittle fracture.
Innovation Solution
Incorporating a fiber sheet embedded as an intermediate layer in the SMC sheet, impregnated with thermosetting resin, and distributing short fibers on at least one side of the fiber sheet to inhibit anisotropy and enhance mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If glass short fiber is distributed in a sheet material body made of uncured thermosetting resin, then the SMC sheet can be used for manufacturing composite materials, but significant differences in bending strength occur between central and peripheral parts due to material flow during press forming
Solution Approach 1:
The fiber reinforcement is segmented into two distinct components: a fiber sheet embedded as an intermediate layer providing base reinforcement, and short fibers distributed on the surface providing additional reinforcement. This segmentation allows each fiber component to perform its function independently, preventing the material flow-induced weakness that occurs in conventional homogeneous SMC sheets.
Solution Approach 2:
The invention creates a composite structure within the SMC sheet by combining the fiber sheet (intermediate layer) with short fibers (surface distribution) and thermosetting resin. This multi-component composite approach ensures that both central and peripheral parts maintain adequate reinforcement even when material flow occurs during press forming, thereby uniformizing bending strength across the product.
2Ease of manufacture
If conventional SMC sheet structure is used, then manufacturing process is simple, but the product exhibits poor stiffness and propensity for brittle fracture
Solution Approach 1:
The SMC sheet incorporates a composite structure with fiber sheet as intermediate layer and short fibers distributed on the surface. This composite architecture provides multiple reinforcement mechanisms that prevent brittle fracture while maintaining manufacturability through existing SMC processing techniques.
Solution Approach 2:
The fiber sheet is specifically positioned as an intermediate layer within the sheet material body, providing localized reinforcement where it is most needed to prevent brittle fracture. The short fibers are distributed on the surface to provide additional local reinforcement. This strategic placement of different fiber components enhances reliability without complicating the manufacturing process.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution achieves uniform bending strength, high stiffness, and high toughness, preventing brittle fracture and ensuring consistent performance across the product.
Implementation Method 1
allowing the fiber sheet to be mechanically impregnated with the thermosetting resins of the lower and upper resin layers
Implementation Method 2
a fiber sheet embedded as an intermediate layer in the sheet material body and impregnated with the thermosetting resin
Data Source
AI summary
A SMC sheet includes: a sheet material body made of a resin compound containing uncured thermosetting resin; and a fiber sheet embedded as an intermediate layer in the sheet material body and impregnated with the thermosetting resin of the sheet material body. Short fiber is distributed on at least one side of the fiber sheet in the sheet material body.