Four-Point Bending Test Jig for Bulk Material Fatigue
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Solution Overview
Problem
Existing methods for testing mechanical and fatigue characteristics of materials, particularly bulk and bonding materials, face challenges in creating suitable test pieces for large-size materials and accurately evaluating deformation in multiple directions, as they often rely on one-dimensional loading which does not match the three-dimensional deformation of semiconductor devices under thermal loads.
Innovation Solution
A mechanical test jig system comprising a primary jig that fixes both sides of a test piece, with upper and lower jigs that load weights on both surfaces, allowing for four-point bending tests that induce completely reversed deformation, enabling evaluation of materials with different bonding characteristics and deformation behaviors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If one-directional loading is used for testing, then the test setup is simple, but it cannot accurately evaluate materials with complex deformation patterns such as ratchet deformation and creep deformation
Solution Approach 1:
The patent transitions from one-dimensional loading to multi-directional loading by implementing a test setup that applies forces in multiple directions simultaneously. This allows the test piece to experience complex deformation patterns including ratchet deformation and creep deformation, accurately evaluating materials that exhibit anisotropic or direction-dependent mechanical properties.
2Measurement precision
If large-size bulk material test pieces are used, then comprehensive mechanical characteristics can be obtained, but it is difficult to manufacture such large test pieces for some materials
Solution Approach 1:
The patent divides the test piece into smaller, manufacturable segments that can be produced separately and then assembled or tested individually. This segmentation approach enables materials that cannot be manufactured in large bulk forms to still undergo comprehensive mechanical testing through smaller test specimens that capture the essential material behavior.
3Measurement precision
If bonding materials are tested in bulk form, then material characteristics can be obtained, but bonding materials often exist only as thin bonding layers with different characteristics from bulk material
Solution Approach 1:
The patent creates test pieces that replicate or copy the actual bonding layer structure and geometry rather than using bulk material substitutes. By fabricating test specimens that accurately reproduce the thin bonding layer configuration, interface structures, and geometric features of the actual application, the testing captures the true mechanical behavior of bonding materials in their actual form.
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 setup allows for accurate acquisition of mechanical and fatigue characteristics of bulk and bonding materials, even those with complex deformation patterns, by ensuring the test piece is suitable for four-point bending and preventing one-directional deformation during testing.
Implementation Method 1
a four-point bending test by a strength test
Implementation Method 2
an upper jig 1 and a lower jig 2, and a positioning jig 3... an upper surface and a lower surface of the primary jig 3 disposed on both sides of the test piece 4
Data Source
AI summary
Some materials desired to acquire mechanical characteristics and fatigue characteristics are difficult to make in a large-size bulk material for a test piece. The invention provides a test jig which includes a primary jig which fixes both sides of a test piece, which is a test object, an upper jig which includes a load portion to load a weight on two places of an upper surface and two places of a lower surface of the primary jig, and a lower jig which includes a load portion to load a weight on two places of the upper surface and two places of the lower surface of the primary jig. The upper surface and the lower surface of the primary jig disposed on both sides of the test piece are on almost the same flat surface.