Biaxial Tensile Testing Machine Linkage Mechanism
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Solution Overview
Problem
Conventional biaxial tensile testing machines require inefficient manual operation for attaching and detaching specimens due to interference between tools and link members, leading to prolonged attachment or detachment times.
Innovation Solution
The material testing machine design features seat surfaces and contact portions that can be moved apart, allowing easy separation of units with chucks and load members, utilizing pins and seat surfaces with opening areas for easy attachment and detachment of specimens, and rockable link members connected to a crosshead for applying biaxial tensile forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If link members are used to connect moving members and load member, then biaxial tensile forces can be applied to the specimen, but tools interfere with the link members during specimen attachment and detachment
Solution Approach 1:
The link member is divided into two separate parts: a first link connected to the first moving member and a second link connected to the load member. These segmented links can be independently positioned and controlled, allowing tools to access the specimen attachment area without interference from the link structure.
Solution Approach 2:
The first link and second link are configured to be nestable within each other when not in use. The first link can be inserted into or alongside the second link, creating a compact arrangement that clears the operational space around the specimen, enabling easy attachment and detachment operations.
2Device complexity
If link members are positioned close to the specimen, then the machine structure is compact, but operation time increases due to tool interference
Solution Approach 1:
The link members are designed with dynamic positioning capability, allowing them to move between a compact storage position (nested together) and an operational position (extended to transmit force). This dynamic adjustment enables the structure to be compact during non-operational phases while providing clear access during specimen attachment and detachment.
Solution Approach 2:
Before specimen attachment or detachment operations, the link members are preliminarily positioned in a retracted or nested state to clear the workspace. This preliminary positioning action prevents interference with tools and operators, enabling efficient specimen handling without time loss.
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
Enables efficient attachment and detachment of specimens, reducing operation time and improving working efficiency while maintaining the capability to apply tensile forces in biaxial directions perpendicular to each other.
Implementation Method 1
The pair of first moving members 93 are connected to the load member 80 by link members 83 each formed of a link 81 and a link 82. The link 81 forming part of each link member 83 is rockably connected to the first moving member 93 by a pivot 97. The link 82 forming part of each link member 83 is rockably connected to the load member 80 by a pivot 85.
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
When a crosshead descends after a specimen is loaded, pins attached to link members contact seat surfaces formed on seat members, and then contact side walls of the seat surfaces. As the crosshead descends further, the pins contacting the seat surfaces press the seat members 31. This pressing force moves a pair of first slide members away from each other as guided by a first rail, and moves a pair of second slide members away from each other as guided by a second rail 24. Consequently, tension loads in biaxial directions perpendicular to each other are applied to the specimen gripped by four chucks 25.