公开(公告)号：US10094751B2

公开(公告)日：2018-10-09

申请号：US15079946

申请日：2016-03-24

Applicant: Bell Helicopter Textron Inc.

Inventor： Xiaoming Li ,  Bogdan R. Krasnowski

IPC: G01N3/08 ,  G01N3/32

Abstract: A method of determining damage tolerance allowables in a specimen, the method includes applying a cyclic load to a specimen until a first crack emanates from a notch in the specimen, the cyclic load having a maximum load and a minimum load. The method also includes applying a subsequent cyclic load to the specimen until the first crack grows to form a second crack emanating from the first crack, the subsequent cyclic load having the same maximum load but a greater minimum load.

公开(公告)号：US10989640B2

公开(公告)日：2021-04-27

申请号：US16125294

申请日：2018-09-07

Applicant: Bell Helicopter Textron Inc.

Inventor： Xiaoming Li ,  Bogdan R. Krasnowski

IPC: G01N3/32 ,  G01N3/06

Abstract: A method for defining a threshold stress curve utilized in fatigue and/or damage tolerance analysis, the method including conducting a direct test method on a plurality of specimens with a notch to generate raw data, the notch in each of the specimens having a notch dimension; determining a plurality of analyzed data points based upon the raw data; determining a regression line based upon the plurality of data points, the regression line including an exponential portion and a power law portion; and connecting the exponential portion and the power law portion of the regression line to form a threshold stress curve based on the regression line.

公开(公告)号：US20200025661A1

公开(公告)日：2020-01-23

申请号：US16124762

申请日：2018-09-07

Applicant: Bell Helicopter Textron Inc.

Inventor： Xiaoming Li ,  Bogdan R. Krasnowski ,  Robert A. Figueroa ,  Robert Wardlaw

IPC: G01N3/62 ,  G06F17/50 ,  G01N3/02

Abstract: A notch treatment method for flaw simulation including providing the specimen with the notch, the notch having a re-melt material layer; isolating the notch; and selectively etching the notch to provide an etched surface of the notch; wherein at least a portion of the re-melt material layer has been removed from the notch. In one aspect, there is provided a notch treatment method for flaw simulation including providing the specimen with the notch, the notch having a re-melt material layer, the specimen includes steel or an alloy thereof; isolating the notch; and selectively etching the notch with a first etching solution and a second etching solution to provide an etched surface on the notch; wherein at least a portion of the re-melt material layer has been removed from the notch.

公开(公告)号：US20180172568A1

公开(公告)日：2018-06-21

申请号：US15379808

申请日：2016-12-15

Applicant: Bell Helicopter Textron Inc.

Inventor： Bogdan Roman Krasnowski ,  Xiaoming Li ,  Chyau Tzeng ,  Robert Patrick Wardlaw ,  Robert Arnold Brack

IPC: G01N3/20 ,  G01N3/02 ,  G01N33/00

CPC classification number: G01N3/20 ,  G01N3/02 ,  G01N3/04 ,  G01N3/24 ,  G01N33/00 ,  G01N2033/0003 ,  G01N2203/0003 ,  G01N2203/0005 ,  G01N2203/001 ,  G01N2203/0023 ,  G01N2203/0062 ,  G01N2203/0252 ,  G01N2203/0266 ,  G01N2203/0282

Abstract: A method for determining a shear property of a sample includes supporting a sample at three or more separate support locations about a periphery of a first surface of the sample in a testing fixture, the sample including a second surface separated from the first surface by a thickness, wherein the sample is axisymmetric about an axis that is orthogonal to the first surface. The method includes applying a load on the second surface of the sample with a load applicator in a direction substantially parallel with the axis, measuring, with a controller, shear testing data of the sample in response to applying the load, and determining, with the controller, a shear property of the sample from the measured shear testing data.

公开(公告)号：US10732085B2

公开(公告)日：2020-08-04

申请号：US16124762

申请日：2018-09-07

Applicant: Bell Helicopter Textron Inc.

Inventor： Xiaoming Li ,  Bogdan R. Krasnowski ,  Robert A. Figueroa ,  Robert Wardlaw

IPC: G01N3/62 ,  G01N3/02 ,  G06F30/15 ,  G06F119/18

Abstract: A notch treatment method for flaw simulation including providing the specimen with the notch, the notch having a re-melt material layer; isolating the notch; and selectively etching the notch to provide an etched surface of the notch; wherein at least a portion of the re-melt material layer has been removed from the notch. In one aspect, there is provided a notch treatment method for flaw simulation including providing the specimen with the notch, the notch having a re-melt material layer, the specimen includes steel or an alloy thereof; isolating the notch; and selectively etching the notch with a first etching solution and a second etching solution to provide an etched surface on the notch; wherein at least a portion of the re-melt material layer has been removed from the notch.

公开(公告)号：US10792896B2

公开(公告)日：2020-10-06

申请号：US14798658

申请日：2015-07-14

Applicant: Bell Helicopter Textron Inc.

Inventor： Bogdan Roman Krasnowski ,  Robert Arnold Brack ,  Xiaoming Li ,  Robert Wardlaw

IPC: B32B7/02 ,  B32B27/08 ,  B32B37/14 ,  B32B27/38 ,  B29C70/06 ,  B29C70/30 ,  B32B5/14 ,  B29L31/30

Abstract: In some embodiments, a rotor system for a rotorcraft includes a yoke, a blade, and a grip that is configured to couple the blade to the yoke. The grip has a plurality of baseline layers and a compliant layer. The baseline layers each have a plurality of fibers disposed in a first polymeric matrix. The compliant layer has a plurality of fibers disposed in a second polymeric matrix. The compliant layer is stronger than the baseline layer and the first polymeric matrix has a different chemical composition than the second polymeric matrix.

公开(公告)号：US10408723B2

公开(公告)日：2019-09-10

申请号：US15379808

申请日：2016-12-15

Applicant: Bell Helicopter Textron Inc.

Inventor： Bogdan Roman Krasnowski ,  Xiaoming Li ,  Chyau Tzeng ,  Robert Patrick Wardlaw ,  Robert Arnold Brack

IPC: G01N3/20 ,  G01N3/24 ,  G01N3/02 ,  G01N3/04 ,  G01N33/00

Abstract: A method for determining a shear property of a sample includes supporting a sample at three or more separate support locations about a periphery of a first surface of the sample in a testing fixture, the sample including a second surface separated from the first surface by a thickness, wherein the sample is axisymmetric about an axis that is orthogonal to the first surface. The method includes applying a load on the second surface of the sample with a load applicator in a direction substantially parallel with the axis, measuring, with a controller, shear testing data of the sample in response to applying the load, and determining, with the controller, a shear property of the sample from the measured shear testing data.

公开(公告)号：US20190003944A1

公开(公告)日：2019-01-03

申请号：US16125294

申请日：2018-09-07

Applicant: Bell Helicopter Textron Inc.

Inventor： Xiaoming Li ,  Bogdan R. Krasnowski

IPC: G01N3/32 ,  G01N3/06

Abstract: A method for defining a threshold stress curve utilized in fatigue and/or damage tolerance analysis, the method including conducting a direct test method on a plurality of specimens with a notch to generate raw data, the notch in each of the specimens having a notch dimension; determining a plurality of analyzed data points based upon the raw data; determining a regression line based upon the plurality of data points, the regression line including an exponential portion and a power law portion; and connecting the exponential portion and the power law portion of the regression line to form a threshold stress curve based on the regression line.

公开(公告)号：US20160282244A1

公开(公告)日：2016-09-29

申请号：US15079946

申请日：2016-03-24

Applicant: Bell Helicopter Textron Inc.

Inventor： Xiaoming Li ,  Bogdan R. Krasnowski

IPC: G01N3/08

CPC classification number: G01N3/08 ,  G01N3/32 ,  G01N2203/0066

Abstract: A method of determining damage tolerance allowables in a specimen, the method includes applying a cyclic load to a specimen until a first crack emanates from a notch in the specimen, the cyclic load having a maximum load and a minimum load. The method also includes applying a subsequent cyclic load to the specimen until the first crack grows to form a second crack emanating from the first crack, the subsequent cyclic load having the same maximum load but a lesser minimum load.

Abstract translation: 一种确定样品中的损伤容限允许的方法，该方法包括向试样施加循环载荷，直到第一裂纹从试样中的切口发出，循环载荷具有最大载荷和最小载荷。 该方法还包括向样品施加随后的循环载荷，直到第一裂纹增长以形成从第一裂纹发出的第二裂纹，随后的循环载荷具有相同的最大载荷但较小的最小载荷。

公开(公告)号：US20160082696A1

公开(公告)日：2016-03-24

申请号：US14798658

申请日：2015-07-14

Applicant: Bell Helicopter Textron Inc.

Inventor： Bogdan Roman Krasnowski ,  Robert Arnold Brack ,  Xiaoming Li ,  Robert Wardlaw

IPC: B32B7/02 ,  B32B27/08 ,  B32B37/14 ,  B32B27/38

Abstract: In some embodiments, a rotor system for a rotorcraft includes a yoke, a blade, and a grip that is configured to couple the blade to the yoke. The grip has a plurality of baseline layers and a compliant layer. The baseline layers each have a plurality of fibers disposed in a first polymeric matrix. The compliant layer has a plurality of fibers disposed in a second polymeric matrix. The compliant layer is stronger than the baseline layer and the first polymeric matrix has a different chemical composition than the second polymeric matrix.

Abstract translation: 在一些实施例中，用于旋翼航空器的转子系统包括轭，叶片和被配置成将叶片耦合到轭架的把手。 手柄具有多个基线层和柔顺层。 基线层各自具有设置在第一聚合物基质中的多个纤维。 顺应层具有设置在第二聚合物基质中的多个纤维。 柔顺层比基层更坚固，第一聚合物基质具有不同于第二聚合物基质的化学组成。