Fatigue Test Rig Homogeneous Contact Adjustment
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Solution Overview
Problem
Current low-cycle fatigue test rigs for turbine engine parts fail to ensure homogeneous contact between blade roots and rotor disc recesses, leading to inaccurate service life calculations and limited accessibility for measuring and control instruments, making them unsuitable for representative industrial assessments.
Innovation Solution
A low-cycle and optionally combined low-cycle and high-cycle fatigue test rig with a support member and test piece that allow for precise adjustment and locking around two perpendicular axes, ensuring consistent contact and reducing deformation risks, while accommodating existing frame and traction means for adaptability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the support member and test piece are made bulky to ensure structural stability, then the reliability of the test rig improves, but the ease of operation deteriorates due to difficult access for measuring and control instruments
Solution Approach 1:
The support member is divided into multiple components: a fixed support structure, a rotatable element mounted on the support member, and a test piece with separate articulation means. This segmentation allows each component to be optimized independently - the support structure provides stability while the rotatable elements enable instrument access and positioning adjustments.
2Reliability
If the test piece and support member are made bulky to ensure structural stability, then the reliability improves, but the device complexity increases making it difficult to equip with measuring and control instruments
Solution Approach 1:
The invention introduces rotational degrees of freedom - the element rotates about a first axis on the support member, and the test piece articulates around a second axis perpendicular to the first axis. These dynamic positioning capabilities enable easy integration of measuring and control instruments at various angles and positions without compromising structural stability.
3Ease of manufacture
If the contact between test piece and bearing surface is not homogeneous at the start of the test, then the ease of manufacture improves, but the measurement precision deteriorates due to distorted service life calculations
Solution Approach 1:
The invention implements preliminary positioning adjustments before the test begins. The element can be rotated about the first axis and the test piece articulated about the second axis to precisely align the contact surfaces. This preliminary action ensures homogeneous contact distribution from the start of the test, eliminating the need for complex manufacturing tolerances while保证ing measurement accuracy.
Solution Approach 2:
The invention changes the positional parameters of the test piece relative to the bearing surface through rotational adjustments. By varying the orientation angles around the two perpendicular axes, the contact characteristics can be optimized to achieve homogeneous stress distribution across the contact area, thereby improving service life calculation accuracy.
Data Source
AI summary
A low-cycle fatigue test rig reproduces bearing of turbine engine parts. The test rig includes a support member that is fixed to a frame and defines at least one bearing surface. A test piece is connected to a traction element for loading the test piece so that the test piece bears against the at least one bearing surface of the support member. The at least one bearing surface is supported by a support element that is mounted to rotate about a first axis on the support member. The test piece is connected to the traction element for articulation around a second axis that is perpendicular to the first axis. The test rig is configured to enable adjusting and locking the support element and the test piece in positions around the above-mentioned axes.