Connection Strength Measurement for Thin-Walled Cylindrical Components
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Solution Overview
Problem
Existing methods for measuring connection strength between cylindrical and cup members, such as those in airbag inflators, face challenges in accurately assessing the strength without deforming the components, particularly when the circumferential wall is thin and subjected to external forces.
Innovation Solution
A method involving axial support without fixation of the annular end surface of the second measurement member, combined with a clamping tool and load application to separate the first measurement member, ensuring minimal deformation and accurate strength measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the circumferential wall is enclosed from the outer side to fix the first measurement member, then the first measurement member is securely fixed, but the thin circumferential wall deforms under external forces
Solution Approach 1:
A cushioning member (rubber or foam material) is introduced as an intermediary between the fixing device and the first measurement member. This cushioning member distributes the clamping force uniformly across the circumferential wall, preventing localized stress concentration and deformation while maintaining secure fixation. The deformable nature of the cushioning member allows it to conform to the cylindrical shape and provide uniform radial pressure.
Solution Approach 2:
The fixing method changes the pressure distribution parameter by using a cushioning member that transforms concentrated point forces into distributed line or area forces. This parameter change in force distribution prevents exceeding the yield strength of the thin circumferential wall, thereby avoiding permanent deformation while maintaining adequate fixation strength.
2Measurement precision
If the annular end surface is fixed to prevent movement, then positioning accuracy is improved, but the natural separation process is interfered with
Solution Approach 1:
The fixing function is segmented into two distinct zones: the circumferential wall is firmly fixed to provide stable positioning, while the annular end surface remains unfixed to allow natural separation. This segmentation enables each part to fulfill its specific function without interfering with the other, ensuring both measurement precision and reliable separation.
Solution Approach 2:
Different fixing conditions are applied to different parts of the measurement member: the circumferential wall receives strong fixation to ensure positioning accuracy, while the annular end surface is deliberately left unfixed to maintain its ability to separate naturally during the separation process. This local differentiation of fixing quality resolves the contradiction between positioning and separation.
3Measurement precision
If external forces are applied to separate the connection portions, then the connection strength is measured, but the thin circumferential wall deforms
Solution Approach 1:
The cushioning member serves as a mediator that transmits the separating force uniformly to the connection portions while preventing direct concentration of force on the thin circumferential wall. This intermediary protection allows accurate connection strength measurement without causing deformation to the measured components.
Solution Approach 2:
The measuring device replicates the actual separation forces and conditions that the connection portions will experience in service, but in a controlled manner. By using the cushioning member to distribute these forces, the measurement process accurately reflects real-world performance without causing damage, effectively creating a safe copy of the separation event.
Data Source
AI summary
The present invention provides a method for measuring connection strength of a measuring object in which a first measurement member and a second measurement member are connected,the measuring object being an object in which the first measurement member in the form of a cylindrical member or a cup member, and the second measurement member in the form of a cylindrical member or a cup member, are connected at respective openings thereof,the method including:fixing, as step 1, the first measurement member by enclosing a circumferential wall thereof from the outer circumferential wall thereof, and axially supporting but to fixing an annular end surface of an opening of the second measurement member;holding in midair, as step 2, the first measurement member fixed in step 1; andpulling away, as step 3, the first measurement member until connection portions of the first measurement member and the second measurement member are separated.