公开(公告)号：US11994436B2

公开(公告)日：2024-05-28

申请号：US17051225

申请日：2019-04-08

Applicant: UNIVERSITY OF SOUTH CAROLINA

Inventor： Dimitrios Rizos

IPC: G01L1/24 ,  B61L23/04 ,  G01M5/00

CPC classification number: G01L1/24 ,  B61L23/045 ,  G01M5/0025

Abstract: Methods of non-destructive rail analysis and evaluation for railroad tracks are provided. The methods can include capturing images of rails over time and at various temperatures. High-contrast patterns can be applied to or associated with a rail to facilitate image analysis. Rail neutral temperature (RNT), stress, strain, and curvature of the track can be determined using image correlation and regression analysis. A stereovision system may be used for rail neutral temperature measurements and for determining effects of a heating method. A non-contacting, nondestructive methodology for RNT and longitudinal rail stress measurements is based on stereo vision image acquisition and Digital Image Correlation (DIC) for acquiring the full field shape, deformation, and strain measurements taken during a thermal cycle. The thermal cycle can be natural or induced.

公开(公告)号：US20180044237A1

公开(公告)日：2018-02-15

申请号：US15674645

申请日：2017-08-11

Applicant: University of South Carolina

Inventor： Dimitrios Rizos

IPC: C04B14/04 ,  C04B28/08 ,  C04B28/02

CPC classification number: C04B14/048 ,  C04B28/02 ,  C04B28/021 ,  C04B28/08 ,  C04B2111/0075 ,  C04B2201/05 ,  C04B2201/52 ,  E01B3/28 ,  Y02W30/92 ,  Y02W30/94 ,  C04B18/08 ,  C04B18/141 ,  C04B18/146 ,  C04B20/0076

Abstract: Concrete that exhibits increased flexibility (i.e., low modulus of elasticity) and high compressive strength is described. High aspect ratio structures as may be formed of the concrete are described. Structures formed of the concrete can have the same high compressive strength as similar structures formed from a more conventional concrete, but can be significantly more flexible, which can allow for better load distribution in the structure and associated assembly. The concrete includes a weathered granite as course aggregate. The materials can be particularly beneficial in forming concrete components of a rail infrastructure, such as railroad ties and slabs.