Multiaxial Fatigue Machine Independent Shaft Systems
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Solution Overview
Problem
Current fatigue testing machines are unable to simultaneously apply rotational and flexional stresses to test samples, limiting their ability to simulate real-world conditions such as those experienced by power transmission shafts in automobiles, and lack configurations for comprehensive multiaxial stress testing.
Innovation Solution
A multiaxial fatigue testing machine is designed with a rotational mechanism featuring a power shaft connected to a motor and a driven shaft, along with a reciprocating mechanism that applies radial loads, allowing for independent operation of rotary and alternative flexion modes, utilizing coupling elements like universal joints and ball bearings to manage stress distribution and prevent unwanted stress on motors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fatigue testing machine uses a single shaft system for applying stresses, then the structure is simple, but it cannot simultaneously apply rotational and flexional stresses to test samples
Solution Approach 1:
The machine is divided into two independent shaft systems: a first shaft system for applying flexional stresses and a second shaft system for applying rotational stresses. Each shaft system operates independently with its own motor, allowing the machine to apply multiple stress types simultaneously without requiring a complex integrated mechanism.
Solution Approach 2:
The machine design enables a single testing apparatus to perform multiple fatigue testing functions by incorporating two shaft systems that can operate independently or simultaneously. This multi-functionality allows the same machine to apply different stress types (flexional and rotational) to test samples, eliminating the need for separate testing machines.
2Reliability
If motors are directly connected to shafts without coupling elements, then the connection is simple, but unwanted stress is transmitted to the motors
Solution Approach 1:
Coupling elements are introduced as intermediary components between the motors and the shafts. These coupling elements serve as mediators that protect the motors from unwanted stresses while transmitting the necessary driving forces to the shafts, ensuring reliable operation without direct motor-shaft connection.
3Adaptability or versatility
If a testing machine can only test one type of stress at a time, then the mechanism is simple, but it cannot simulate real-world multiaxial stress conditions
Solution Approach 1:
The two shaft systems are designed to operate simultaneously and continuously, allowing the machine to apply both flexional and rotational stresses at the same time. This continuous multiaxial stress application enables realistic simulation of real-world conditions without requiring sequential testing, thereby improving testing efficiency and productivity.
Data Source
AI summary
A multiaxial fatigue machine comprising a rotational mechanism; a driven shaft arranged collinearly with a first power shaft of the rotational mechanism and a reciprocating mechanism. The rotational mechanism has a first motor and a first fastening element configured to be connected to a test element that can be also connected to a second fastening element of the driven shaft to transmit to said test element a rotational force produced by the first motor. The reciprocating mechanism has a second power shaft, a second motor, and a linear rotational transmission, wherein the reciprocating mechanism is configured to apply an alternating force on the test element.