ASTM F1044 Test Fikstürü

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ASTM F1044 – Standard Test Method for Shear Testing of Calcium Phosphate Coatings and Metallic Coatings

 

ASTM F1044 covers shear testing of continuous calcium phosphate coatings and metallic coatings adhering to dense metal substrates at ambient temperatures.

It assesses the degree of adhesion of coatings to substrates, or the internal cohesion of a coating in shear, parallel to the surface plane.

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ASTM F1044 / Significance and Use

The shear test method is recommended for shear testing of calcium phosphate and metallic/substrate combinations and can provide information on the adhesive

or cohesive strength of coatings under a uniaxial shear stress.

The test method may be useful for comparative evaluation of adhesive or cohesive strengths of a variety of types of coatings.

Information developed using this test method may be useful for certain quality control and design purposes.

The test method should not be considered to provide an intrinsic values for utilization directly in making calculations specified environmental stresses.

Processing variables, such as substrate preparation prior to coating, surface texture, coating technique variables or post-coating heat treatment, or heat may

introduce a significant effect on the results of the shear test.

The specimen being evaluated must be representative of the actual end-use coating

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ASTM F1044 / Apparatus

Testing Machines—Machines used for testing shall conform to the requirements of Practices ASTM E4.

The loads used in determining shear strength and yield strength shall be within the loading range of the testing machine as defined in Practices ASTM  E4.

See also Test Methods ASTM E8/E8M.

Gripping Device

General—Various types of grips may be used to transmit the load applied to the specimens by the testing machine.

To ensure axial shear stress, it is important that the specimen axis coincide with the centerline of the heads of the testing machine and that the coating test plane be

parallel to the axial load.

Any departure from this requirement (that is, any eccentric loading) will introduce bending stresses that are not included in the usual stress calculation (force/cross

-sectional area).

*** Before conducting ASTM F1044 , it is important to read the entire specification. Standards can be obtained from appropriate standard authorities.

 

***PARSROS  offers several types of grips and fixtures which will enable you to perform a variety of tests

  that are accurate and repeatable.