Hollow Test Body With Threaded Nozzle For Material Testing
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Solution Overview
Problem
Existing test specimens for material testing are not suitable for secure and simple attachment during bursting and tensile tests, limiting their application and accuracy in characterizing material properties, especially for plastic components.
Innovation Solution
A hollow tubular test body with a nozzle-shaped inlet area featuring an external or internal thread for secure attachment, allowing for injection-molded geometries that can perform both tensile and bursting tests, enabling a direct correlation between bursting pressure and mechanical strengths, and accommodating various material aging states and geometries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a hollow cylindrical test body is used for material testing, then the test specimen can be used for ultrasonic crack propagation measurements, but it is not suitable for bursting and tensile tests due to lack of attachment features
Solution Approach 1:
The test body is designed with multiple functional features integrated into a single geometry: the hollow cylindrical shape enables ultrasonic crack propagation measurements, while the integrated threads at the ends enable bursting and tensile tests. This multi-functional design allows one specimen geometry to serve multiple testing purposes, resolving the contradiction between versatility and complexity.
2Reliability
If threads are added to the test body for secure attachment during bursting and tensile tests, then attachment security is improved, but the manufacturing complexity increases
Solution Approach 1:
The threads are integrated directly into the test body geometry during the same manufacturing process (injection molding) that creates the hollow cylindrical shape. By combining the attachment features with the main specimen structure in a single manufacturing step, the patent achieves secure attachment without significantly increasing manufacturing complexity.
3Reliability
If the pipe has a larger diameter in the threaded nozzle area compared to the middle test range, then secure attachment is enabled, but the wall thickness varies along the length
Solution Approach 1:
The test body features localized variations in diameter and wall thickness: the middle section maintains uniform dimensions for consistent mechanical testing, while the end sections (nozzles) have larger diameters and increased wall thickness to accommodate threads and provide secure attachment. This local differentiation optimizes each region for its specific function while maintaining manufacturability through injection molding.
4Adaptability or versatility
If injection-molded tubular test specimen geometries with molded threads are used, then a wide variety of materials and aging states can be tested in the same geometry, but the manufacturing process becomes more complex
Solution Approach 1:
The injection molding process is configured to produce a universal test body geometry that can accommodate different materials (thermoplastics, coatings, 2-component solutions) and aging states. The molded threads and hollow cylindrical shape remain consistent across all material types, enabling direct comparison while maintaining a relatively simple single-step manufacturing process.
Data Source
Figure 1
AI summary
The hollow test body (1) has an inlet for an inspection part cavity. The inlet part is formed as a connecting piece (3, 4) having an external or an internal thread (7, 8) for fastening to a testing set. Near the threaded end a pipe or tube is provided having a larger outside diameter (D1) and or a larger wall thickness than in the middle part. The body may tubular or spherical. One end of the tube end may be sealed with the other end be threaded. Both tube ends may be threaded. An independent claim is included for a method.