# US 2026/0092845 A1 · Material testing machine and control method for material testing machine

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 2026/0092845 A1
- Document ID: US20260092845A1
- Status: Published application
- Kind: A1
- Application number: 19/339,905
- Filed: 2025-09-25
- Published: 2026-04-02
- Earliest claimed: 2024-09-27
- Assignees: Shimadzu Corporation
- Applicants: Shimadzu Corporation
- Inventors: Daisuke HAGIHARA
- Web page: https://patentgrep.com/patent/US20260092845A1

## CPC

- G01N 3/10: generated by pneumatic or hydraulic pressure (G01N3/18 takes precedence)
- G01N 3/066: {with electrical indicating or recording means}
- G01N 3/068: {with optical indicating or recording means}
- G01N 3/08: by applying steady tensile or compressive forces (G01N3/28 takes precedence)
- G01N 3/32: by applying repeated or pulsating forces
- G01N: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES (measuring or testing apparatus or processes other than immunoassay, involving enzymes or microorganisms C12M, C12Q)

## Abstract

A fatigue testing machine is a fatigue testing machine that executes a fatigue test for measuring a mechanical property of a test piece by applying a test force to the test piece, the fatigue testing machine comprising: a hydraulic actuator that applies a test force to the test piece; a generation unit that generates a sinusoidal input waveform indicating a test force target value, which is a target value of the test force; a detection unit that detects the test force applied to the test piece by the hydraulic actuator; and a calculation unit that calculates a distortion rate of an output waveform indicating a detection result of the detection unit during execution of the fatigue test.

## Claims

### Claim 1

A material testing machine that executes a material test for measuring a mechanical property of a specimen by applying a load to the specimen, the material testing machine comprising:
a load mechanism that applies a load to the specimen;
a generation unit that generates a sinusoidal input waveform indicating a target value of the load;
a detection unit that detects the load applied to the specimen by the load mechanism; and
a calculation unit that calculates a distortion rate of an output waveform indicating a detection result of the detection unit during execution of the material test.

### Claim 2 (depends on 1)

The material testing machine according to claim 1, wherein
the calculation unit performs an FFT on the output waveform to calculate the distortion rate.

### Claim 3 (depends on 2)

The material testing machine according to claim 2, wherein
the calculation unit comprises a PLD, and
the PLD performs the FFT on the output waveform.

### Claim 4 (depends on 1)

The material testing machine according to claim 1, wherein
the material test is a fatigue test, and
the material testing machine comprises a display control unit that displays the distortion rate on a display during execution of the fatigue test.

### Claim 5 (depends on 4)

The material testing machine according to claim 4, wherein
each time the calculation unit calculates the distortion rate, the display control unit updates the distortion rate displayed on the display.

### Claim 6 (depends on 4)

The material testing machine according to claim 4, wherein
the display control unit displays the input waveform and the output waveform as graphs on the display.

### Claim 7 (depends on 4)

The material testing machine according to claim 4, comprising
a determination unit that determines that a control accuracy of the load mechanism is poor when the distortion rate is equal to or greater than a preset threshold value, wherein
the display control unit displays a determination result of the determination unit on the display.

### Claim 8

A control method for a material testing machine that includes a load mechanism for applying a load to a specimen and executes a material test for measuring a mechanical property of the specimen, the method comprising:
a generation step of generating a sinusoidal input waveform indicating a target value of the load;
a detection step of detecting the load applied to the specimen by the load mechanism; and
a calculation step of calculating a distortion rate of an output waveform indicating a detection result in the detection step during execution of the material test.