Arrangement and method for the synchronous determination of the shear modulus and of the Poisson's number on samples of elastically isotropic and anisotropic materials

US10151645B2 · kind B2 · utility

Assignee

• Fraunhofer-Gesellschaft zur förderung der angewandten Forschung e.V. · DE

Inventors

• Kong Boon Yeap · Clifton Park, US
• Malgorzata Kopycinska-Mueller · Dresden, DE
• Ehrenfried Zschech · Radebeul, DE
• Martin Gall · Kalamazoo, US

Key dates

• Filing date: Sep 2, 2014
• Grant date: Dec 11, 2018
• Expiry date: Nov 2, 2036

Classification

• Technology area (CPC G): Physics
• CPC primary: G01N2203/0069
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

The invention relates to an arrangement and to a method for the synchronous determination of the shear modulus and of the Poisson's number on samples of elastically isotropic and anisotropic materials. In the arrangement, an indenter is movable in parallel with its longitudinal axis (A) in the direction of the surface of a sample such that a force action is exerted on the material by its tip. The force can be determined by a device for measuring this force and the indenter is additionally deflected in translation along at least one further axis. The longitudinal axis (A) of the indenter is aligned at an angle ≠90° with respect to the surface of the sample and the indenter carries out an upward movement and a downward movement. In this respect, a device is present for calculating the shear modulus G and the Poisson's number v from the contact stiffness k determined in this manner, from the acting normal force P, from the indentation modulus MS and from the shear modulus-related parameter NS of the sample while taking account of the respective angle θ.