ASTM B975-15 pdf download.Standard Test Method for Measurement of Internal Stress of Metallic Coatings by Split Strip Evaluation (Deposit Stress Analyzer Method).
1.1 This test method for determining the internal tensile or compressive stress in applied coatings is quantitative. It 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 500 to 145 000 psi (3.45 to 1000 MPa).
1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appro- priate safety and health practices and determine the applica- bility ofregulatory limitations prior to use. 2. Referenced Documents 2.1 ASTM Standards: 2 B636 Test Method for Measurement of Internal Stress of Plated Metallic Coatings with the Spiral Contractometer E177 Practice for Use of the Terms Precision and Bias in ASTM Test Methods E691 Practice for Conducting an Interlaboratory Study to Determine the Precision of a Test Method 2.2 IEC Standard: 3 IEC 61010 Safety Requirements for Electrical Equipment for Measurement, Control, and Laboratory Use 3
. Terminology
3.1 Definitions ofTerms Specific to This Standard: 3.1.1 average deposit thickness, n—average deposit thick- ness equals the deposit weight in grams divided by the specific gravity of the deposit in grams per cubic centimetre multiplied by the plated deposit surface area per test strip (see Eq 3). 3.1.2 constant K, n—this certifiable calibrated number is determined experimentally for each lot of test strips manufac- tured to enable simple mathematical calculation of the internal deposit stress while factoring the influence of percent elonga- tion difference between the deposit and the substrate without the use of complicated bent strip formulas. See Note 4.
3.1.3 helix, n—metal strip approximately 0.01 to 0.013 in. (0.025 to 0.033 cm) thick formed as a helix approximately 0.9 in. (2.3 cm) in diameter and 0.61 in. (15.5 cm) long with or without a polytetrafluoroethylene (PTFE) coating on the inside surface. 3.1.4 internal stress, n—stress in a given layer of coating can result from foreign atoms or materials in the layer that stress the natural structure ofthe deposit as the coating is being formed from sources independent of foreign atoms such as misfit dislocations and the result of additional processing. ASTM B975 pdf download.