Triangular CFRP Honeycomb Core for Dimensional Stability
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Solution Overview
Problem
Conventional lightweight construction core materials for sandwich structures, such as foamed materials and honeycomb cores, exhibit high thermal expansion coefficients and anisotropic mechanical properties, leading to undesirable deformations and direction-dependent behavior, which are not suitable for applications requiring extreme dimensional stability, especially in optical instruments.
Innovation Solution
A honeycomb core with triangular cells made from carbon fiber reinforced plastic (CFRP) is designed using flat laminate strips with specific slot configurations, allowing for a quasi-isotropic structure with adjustable thermal expansion coefficients and high dimensional stability, fabricated cost-effectively without elaborate devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If conventional lightweight construction core materials (foamed materials, aluminum honeycomb, aramid honeycomb) are used, then low weight is achieved, but thermal expansion coefficient is too high leading to dimensional instability
Solution Approach 1:
The patent uses carbon fiber reinforced plastic (CFRP) composite material to manufacture the honeycomb core. CFRP has a thermal expansion coefficient close to zero and high mechanical strength, which resolves the contradiction by providing both low weight and high dimensional stability under temperature changes, unlike conventional materials such as aluminum or aramid honeycomb.
Solution Approach 2:
The patent changes the material parameter from conventional lightweight materials to CFRP, which has fundamentally different thermal and mechanical properties. This parameter change enables the honeycomb core to maintain dimensional stability while remaining lightweight, as CFRP's near-zero thermal expansion coefficient compensates for temperature variations.
2Weight of moving object
If conventional honeycomb cores are used, then low weight is achieved, but anisotropic mechanical properties lead to direction-dependent behavior
Solution Approach 1:
The patent employs a triangular cell geometry instead of the conventional hexagonal or square cells. The triangular configuration with specific orientation arrangements creates more isotropic mechanical properties in the plane of the honeycomb core, reducing direction-dependent behavior while maintaining the lightweight advantage of honeycomb structures.
3Stability of the object's composition
If CFRP honeycomb cores are used to solve thermal expansion, then dimensional stability is improved, but manufacturing cost increases and application flexibility is restricted
Solution Approach 1:
The patent segments the CFRP structure into flat laminate strips that are assembled into the honeycomb core. This segmentation allows for simpler, more cost-effective manufacturing compared to forming entire honeycomb structures from solid CFRP, while maintaining the dimensional stability benefits of CFRP material.
Solution Approach 2:
The patent uses flat laminate strips with specific local slot configurations that interlock to form the honeycomb structure. This local quality approach allows standard CFRP laminate manufacturing techniques to be used, reducing overall manufacturing complexity and cost while achieving the required dimensional stability through the CFRP material properties.
4Stability of the object's composition
If CFRP honeycomb cores are used to solve thermal expansion, then dimensional stability is improved, but application flexibility is restricted
Solution Approach 1:
By segmenting the structure into flat laminate strips that can be easily assembled and disassembled, the patent enhances application flexibility. These modular strips can be configured for different honeycomb sizes and geometries, allowing the same CFRP technology to be adapted to various applications such as optical mirrors, telescope structures, and other precision instruments requiring dimensional stability.
Data Source
AI summary
A honeycomb core for dimensionally stable components (e.g., a reflector) in sandwich construction with a plurality of cells with a triangular cell cross section made from carbon fiber reinforced plastic. The honeycomb core is assembled from flat laminate strips by plugging, wherein the laminate strips have slots running transversely to the extension direction respectively on their longitudinal side. The laminate strips are connected to one another in such a way that the slots of three laminate strips engage in a positive-locking manner in one another at a respective intersection point to form the corners of the cells of the honeycomb core.