公开(公告)号：US20170146338A1

公开(公告)日：2017-05-25

申请号：US15321934

申请日：2015-06-07

Applicant: ILLINOIS TOOL WORKS INC.

Inventor： Roy D. ALLEN

IPC: G01B11/16

CPC classification number: G01B11/161 ,  G01B11/165 ,  G01L1/246

Abstract: This disclosure presents a method of measuring the strain response of a test material remotely by optical devices using a thin multi-layer assembly, called an optical strain gauge, which is attached directly to the test specimen by pair of adhesive patches built into the assembly. The optical strain gauge assembly attaches quickly and easily by just pressing it onto the specimen by virtue of the two pressure-activated adhesive patches. There is typically no surface preparation necessary for the test specimen. The spatial separation between the two patches adhered to the specimen surface serves to establish an initial gauge length for calculating strain by measuring the stress induced changes to this separation when a load is applied to the test specimen.

公开(公告)号：US20180216929A1

公开(公告)日：2018-08-02

申请号：US15745811

申请日：2016-07-25

Applicant: ILLINOIS TOOL WORKS INC.

Inventor： Dr. Christian J. HOEHL ,  Martin A. PETERSON ,  Roy D. ALLEN

IPC: G01B11/16 ,  G02B27/10 ,  G06T7/00

CPC classification number: G01B11/16 ,  G02B27/10 ,  G06T7/0004 ,  G06T7/97

Abstract: The present disclosure provides an apparatus and method which uses a field splitter or a beam splitter for the purpose combining two different views of a materials testing sample under materials testing into a single image. This allows for three-dimensional strain measurement in the context of material/compound testing. In particular, the time and stress dependent change in gauge length can be tracked and calculated in order to calculate the time and stress dependent strain. The method and apparatus allows imaging on a single image sensor for the three-dimensional strain calculation.