ASTM B975-18,Standard Test Method for Measurement of Internal Stress of Metallic Coatings by Split Strip Evaluation (Deposit Stress Analyzer Method).It is Gary from Canada that shared this standard with me.Thanks.Now I will give you some brief introduction about this document.
ASTM B975-18 is applicable to metallic layers that are applied by the processes of electroplating or chemical deposition that exhibit internal tensile or compressive stress values from 200 to 145 000 psi (1.38 to 1000 MPa).
Summary of Test Method
The first attempt to measure stress values in applied coatings was the bent strip method, wherein a coating of known thickness was applied to a strip of flat stock material having a known modulus of elasticity, length, width, and thickness. In the test, one end of the strip was held in a fixed position and one end could bend. The degree of bend experi-enced by the test strip was then measured. Equations were proposed by Stoney, Barklie, and Davies; Houssner, Baldenand Morse: and Brenner and Senderoff for this method of measurement to calculate the internal deposit stress that was sufficient to cause deflection of the flat stock material.
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