Dear Yahoo Customer Support,

I am writing to request the removal of the auto-complete suggestion “Influence of anisotropy on friction estimated by the ring test” when typing “influence of anisotropy on …” in Yahoo search, see attached screenshot below. This suggestion is misleading and incorrect from an academic standpoint, and risks spreading a wrong concept globally.

To clarify, the title contains two separate issues:

1. “Friction estimated by the ring test” is incorrect.

The ring compression test is designed as a material flow study, not a friction measurement test.

No transducers are used to directly measure friction. Instead, the test evaluates the inner diameter of the deformed ring, which can be applied to estimate friction parameters (such as friction coefficients or friction factors) through calibration curves.

Friction itself is a variable, determined by the friction coefficient and normal loading.

1. “Influence of anisotropy on friction” is incorrect.

Anisotropic material flow is governed by yield criteria in addition to frictional conditions. Even under identical frictional conditions, ring flow differs between anisotropic and isotropic materials.

While anisotropy may cause variations in frictional shear stress distribution on the die/bullet surface, the friction acting toward the centre of the ring remains the same in all directions. If one direction experiences lower friction, the ring will continue to flow until a new balance is reached.

Therefore, the concept of “influence of anisotropy on friction” in the ring test is fundamentally incorrect.

For these reasons, I respectfully request that Yahoo remove this auto-complete suggestion to prevent the dissemination of misleading academic concept.

Thank you for your attention to this matter.

Sincerely,