Threaded Bolt Shear Test Sleeves for Accurate Alignment
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Solution Overview
Problem
Existing methods for shear testing threaded sections of a bolt do not provide accurate and reliable shear testing, particularly for threaded sections of bolts, leading to inconsistent and potentially skewed results due to bending forces and improper alignment.
Innovation Solution
A system and method for applying a shear test to a threaded section of a bolt using a shear die set with a fork, center and support sleeves, and a cutter block, ensuring proper alignment and support to minimize bending forces and improve data accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a standard double shear test setup is used for threaded bolt sections, then the test can be performed with minimal bending, but the threaded section cannot be properly supported and aligned, leading to skewed results
Solution Approach 1:
Sleeves are introduced as intermediary components between the threaded bolt section and the shear test apparatus. The inner sleeve engages with the threaded section while outer sleeves engage with the fork legs, mediating the connection and enabling proper support and alignment of the threaded section during shear testing
Solution Approach 2:
The support system is segmented into multiple components: inner sleeves that engage the threaded section, outer sleeves that engage the fork legs, and the fork structure itself. This segmentation allows each component to perform its specific function independently, providing comprehensive support and alignment
2Device complexity
If the threaded section is directly placed in the shear test without proper support, then the device complexity is reduced, but bending forces increase and alignment becomes improper, skewing test results
Solution Approach 1:
The sleeves act as mediators that prevent direct contact between the threaded section and the fork legs, eliminating the harmful bending forces that would occur with direct placement. The inner sleeve supports the threaded section while the outer sleeves support the fork, distributing loads properly
Solution Approach 2:
The sleeve configuration provides beforehand cushioning by pre-establishing proper load paths and support structures before the shear test begins. The nested sleeve arrangement ensures that bending forces are prevented from the outset rather than correcting them during testing
Data Source
AI summary
A system having: a shear die set having a fork that includes first and second legs that are have grooves and are spaced from each other to define a test cavity; and a center sleeve that extends between the legs and is radially larger than the first leg groove, the center sleeve has an inner threaded surface and receives a threaded portion of the bolt; a first support sleeve having an inner threaded surface that receives a threaded portion of the bolt, and the first support sleeve has an outer diameter surface that fits in the first leg groove; and a second support sleeve having a same size and shape as the first support sleeve and receives a threaded portion of the bolt and fits in the second leg groove; and the outer diameter of the first support sleeve is different than the outer diameter of the center sleeve.