What is internal stress?

Generally speaking, it is thought that internal stress is caused by distortion in the material of sample. In this case, distortion means degree of deformation including change of volume, and stress means internal force per unit area which is being applied on a cross section, in other words, the force which adjacent areas of inside of an object give influences to each others.

Products to measure internal stress

We have 2 different products to measure internal stress. One is the Spiral-Contract meter, which is compliant to JIS H8626 and ASTM B636/636M-15 standards. The other one is Strain Gauge-Type Stress Meter, which measures stress of substrate by using sensor.

YAMAMOTO-MS

2024.04.01

SPIRAL CONTRACT-METER SET (B-72WJ)

https://www.yamamoto-ms.co.jp/en/product/b-72wj/

A set that combines a temperature controller B-93C for Japan and a heater with a temperature fuse (AC100V).Spiral Contract-Meter is a test equipment used to measure the internal stress of plating film.Features● Compliant with JIS H8626 and ASTM B636/636M-15 standards. (4000mL tank is compliant with ASTM standard).● Excellent reproducibility● Can be used for alkaline plating bath.● Can measure internal stress by voluntary timings.● Can start quickly since the set contains clasps for electro de...

YAMAMOTO-MS

2020.08.31

B-72W1-YTC300 SPIRAL CONTRACT-METER SET（JIS/ASTM)

https://www.yamamoto-ms.co.jp/en/product/b-72w-ytc300/

A set that combines CE marking with a temperature controller that supports AC100-230V voltage and a heater with a thermal fuse (DC48V).Spiral Contract-Meter is a test equipment used to measure the internal stress of plating film.Features● Compliant with JIS H8626 and ASTM B636/636M-15 standards. (4000mL tank is compliant with ASTM standard).● Excellent reproducibility● Can be used for alkaline plating bath.● Can measure internal stress by voluntary timings.● Can start quickly since the set co...

YAMAMOTO-MS

2020.08.31

B-72WJ-SG STRAIN GAUGE TYPE STRESS METER

https://www.yamamoto-ms.co.jp/en/product/b-72wj-sg/

Used for measurement of microstress unable to be determined by existing stress-meters. Insert dedicated stress-meter board into the slot of the Programmable Power Supply Model-YPP15100 or YPP15031. The data being measured will be displayed on a real-time basis and accumulated in the computer. The data can be edited using general-purpose spreadsheet software. (PC is sold separately).The end of the product number varies depending on the power supply included in a set.With YPP15100：B-72WJ-SG-10...

Related treatise

https://www.yamamoto-ms.co.jp/img/JSFS200704.pdf

(This treatise is Japanese only)