Loading Pad Intermediary Layer for Stress Distribution
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Solution Overview
Problem
The tension pad's structure, with stiff specimen and back skin and a low-elastic body in between, leads to local stress concentration in the adhesive layers, causing a deterioration in load-bearing capacity.
Innovation Solution
A loading pad with a back skin, an elastic body between the back skin and the specimen, and an inserted member between the elastic body and the specimen, all bonded as one unit, where the inserted member is less rigid than the specimen and more rigid than the elastic body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a low-elastic body is bonded between stiff specimen and back skin using adhesive agent, then the loading pad structure is simple, but stress concentrates locally on the adhesive agent layers causing deterioration of load-bearing capacity
Solution Approach 1:
An inserted member is introduced as an intermediary component between the elastic body and the specimen. This inserted member has intermediate rigidity (higher than the elastic body but lower than the specimen), serving as a transition layer that mediates the stress transfer between components of different rigidities, thereby preventing stress concentration in the adhesive layers.
Solution Approach 2:
The rigidity parameter is gradually changed across the loading pad structure. By positioning the inserted member with intermediate rigidity between the elastic body (low rigidity) and the specimen (high rigidity), the rigidity transition becomes gradual rather than abrupt, which reduces stress concentration in the adhesive bonds.
2Ease of manufacture
If stiff specimen and back skin are directly connected with low-elastic body, then manufacturing is easy, but rigidity varies greatly causing stress concentration in adhesive layers
Solution Approach 1:
The inserted member acts as a mediator component that bridges the gap between components with vastly different rigidities. It is bonded to both the elastic body and the specimen, creating intermediate transition zones that distribute stress more evenly and prevent concentration at the adhesive layers.
Solution Approach 2:
The loading pad employs a composite structure consisting of multiple materials with different rigidity properties. The inserted member material is selected to have intermediate rigidity characteristics, creating a composite system that smoothly transitions between soft and hard components, thereby reducing stress concentration.
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 configuration alleviates local stress concentration and suppresses the deterioration of load-bearing capacity by making the rigidity change more gradual across the loading pad.
Implementation Method 1
an elastic body that is provided between the back skin and the specimen
Implementation Method 2
The back skin, the elastic body, and the inserted member are bonded as one unit
Data Source
AI summary
A loading pad to be attached to a specimen to apply a load to the specimen includes: a back skin on which the load is applied; an elastic body that is provided between the back skin and the specimen; and an inserted member that is provided between the elastic body and the specimen. The back skin, the elastic body, and the inserted member are bonded as one unit. The inserted member is less rigid than the specimen, and is more rigid than the elastic body.