Find the most up-to-date version of ANSI B at Engineering ASME B / ANSI/ASME B – Surface Texture and Gaging for Screw Threads Package ASME B and ANSI/ASME B The ASME B46 1 ANSI ASME. The American Standard for Surface Texture in ANSI B gives Ra as the standard surface finish designation. In most applications where RMS is called.

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As the voice of the U. Some of the parameters depend on the definition of a local minimum and a local maximum. The Projected Area, S2Aexpresses the area of the flat x,y plane as given in the denominator of R The relative amplitudes for the different angles are found by summation of the amplitudes along M equiangularly separated radial lines, as shown in the figure below. With this definition Srwi is always between 0 and 1. Note,that negative peak artifacts may cause this parameter to be underestimated and in such cases it might be appropriate to perform some noise filtering.

This may be the case for image asni well organized linear structures.

ANSI-ASME B46.1-1985.pdf

For an anisotropic n46 the correlation length is in the direction perpendicular to the surface lay. These lines are marked Z 0. For Gaussian height distributions S ku approaches 3.

The Fractal Dimension, Sfd is calculated for the different angles by analyzing the Fourier amplitude spectrum; for different angles the amplitude Fourier profile is extracted and the logarithm of the frequency and amplitude coordinates calculated.

Root Mean Square Gradient. It defines surface texture and its constituents: Smaller values indicate broader height distributions and visa versa for values greater than 3. When there are less than five valid maximums or five valid minimums, the parameter is not defined. The spatial properties annsi described by five parameters. Subscription pricing is determined by: If anso document is revised or amended, you will be notified by email. This standard is also available to be included in Standards Subscriptions.

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The amplitude sum, b ralong a semicircle with the radius, ris. Maximum Peak Height Sp: These parameters reflect slope gradients and their calculations are based on local z-slopes. You may delete a document from your Alert Profile at any time. The Ten Point Height, S10 zis defined as the average height of the five highest local maximums plus the average height of the five lowest local minimums:.

The Reduced Summit Height, Spkis the height of the upper left triangle.

Roughness Parameters

The Radial WavelengthSrwis the dominating wavelength found in the radial spectrum. In principle, the texture aspect ratio has a value between 0 and 1. If the angle b4 the ridges is turned clockwise, the angle is positive and if the angle of the ridges is turned anti-clockwise, the angle becomes negative. We have no amendments or corrections for this standard. The surface bearing area ratio curve, which is also called the Abbott curve, is calculated by accumulation of the height distribution histogram and subsequent inversion.

The functional parameters for characterizing bearing and fluid g46 properties are described by six parameters.

All six parameters are defined from the surface bearing area ansl curve shown in the figures below. The Texture Aspect Ratio Parameters, Str20 and Str37are used to identify texture wnsi uniformity of texture aspect. The Surface Area, S3Aexpresses the area of the surface area taking the z height into account as given in the numerator of R Large values of S vi indicate large void volumes in the valley zone.


If there is a very dominating wavelength, Srwi is close to 0, and if there is no dominating wavelength, it is close to 1.

Parameters associated with the two-dimensional DIN standard are also calculated based on the bearing area ratio curve. Dominant Radial Wave Length. The table lists the roughness parameters by their symbol, name, corresponding 2D standard anis unit. Shw corresponds to the radius r 0.

For images consisting of parallel ridges, the texture direction is parallel to the direction of the ridges. For a surface with a dominant lay, the parameters will tend towards 0.

Fourier spectrum and the angular and radial spectra. The angle measured, is the angle difference between the two most dominant angles found in the image by analyzing its autocorrelation function. All the parameters are based on two-dimensional standards that are extended to three dimensions. The Texture Direction IndexStdiis a measure of how dominant the dominating direction is, and is defined as the average amplitude sum divided by the amplitude sum of the dominating direction:.

Available for Subscriptions Available in Packages Standard h46 included in: We calculate Std from the Fourier spectrum. The Density of SummitsSdsis the number of local maximums per area:. This standard is also available in these packages:. It also defines parameters for specifying surface texture.

The Surfaces Area Ratio, S drexpresses the increment of the interfacial surface area relative to the area of the projected flat x,y plane:. For a Gaussian height distribution S bi approaches 0.