Wooden Body Connection Device with Composite Insert and Decoupling Layer
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Connection devices between materials with different expansion coefficients and load properties face detachment risks due to cross-sectional changes in wooden bodies exposed to climate changes, leading to unreliable connections.
Innovation Solution
A connection device featuring a wooden body with a retention recess and a composite body inserted into it, where a curable composite mass is placed between them, with an intermediate layer for decoupling and a composite body design that includes local or area-by-area recesses for enhanced frictional and mechanical engagement, ensuring the composite mass adheres to the wooden body without weakening the connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the composite body is directly connected to the composite mass without an intermediate layer, then the mechanical engagement strength is improved, but the connection reliability deteriorates due to detachment risk from differential expansion and load properties
Solution Approach 1:
An intermediate layer is introduced between the composite body and composite mass to act as a mediator. This layer decouples the two components, allowing them to move independently relative to each other while maintaining connection. The intermediate layer absorbs differential expansion and contraction forces, preventing stress concentration at the interface and eliminating detachment risk while preserving mechanical engagement strength.
2Stability of the object's composition
If the composite body is rigidly fixed in the retention recess, then the connection stability is improved, but the ability to accommodate cross-sectional changes in wooden bodies deteriorates
Solution Approach 1:
The connection system transitions from a rigid fixed state to a dynamic state where the composite body can move within the retention recess. The intermediate layer enables this dynamic behavior, allowing the composite body to accommodate cross-sectional changes in the wooden body while maintaining stable connection through friction and adhesion forces.
3Force
If the composite mass is strongly bonded to the composite body, then the load carrying capacity is improved, but the risk of splitting the wooden body deteriorates
Solution Approach 1:
The intermediate layer serves as a stress-distributing mediator between the composite mass and composite body. It prevents stress concentration at the interface that would otherwise be transmitted to the wooden body, thereby reducing splitting risk while maintaining load carrying capacity through distributed friction and adhesion forces.
Solution Approach 2:
The intermediate layer acts as a cushioning element that absorbs and distributes forces before they can cause damage to the wooden body. This preemptive stress distribution prevents splitting by ensuring forces are transmitted gradually through the wooden material rather than concentrated at critical points.
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
This solution provides a reliable and durable connection that allows for cross-sectional changes in wooden bodies without weakening the mechanical engagement, reducing the risk of splitting and ensuring permanent reliability by shifting the center of force transmission deeper into the wooden body.
Implementation Method 1
a composite mass is curably inserted in an interstice in the retention recess between the wooden body and the inserted composite body such that the composite body is substantially frictionally secured in the retention recess
Implementation Method 2
the composite mass is simultaneously held by adhesive forces with the contact surface towards the retention recess in the wooden body
Data Source
AI summary
Connection device having at least one receiving building component, in particular a wooden body (1), which comprises at least a retention recess (2), in particular a continuous retention recess, and having a composite body (3) which is inserted into the retention recess (2) in the wooden body (1), wherein a composite mass (4) is curably inserted in an interstice (7) in the retention recess (2) between the wooden body (1) and the inserted composite body (3) such that the composite body is substantially frictionally secured in said retention recess (2), wherein an intermediate layer (5), in particular as a formation of the surface of the composite body and/or the composite mass, is at least partially provided between the composite body and the composite mass, providing at least partial decoupling of the composite mass from the composite body.