Test piece, test method, wind turbine generator system

• US 9,581,529 B2
• Filed: 07/01/2014
• Issued: 02/28/2017
• Est. Priority Date: 07/02/2013
• Status: Active Grant

• Current Assignee: Wobben Properties Gmbh (Aloys Wobben Stiftung)
• Original Assignee: Wobben Properties Gmbh (Aloys Wobben Stiftung)
• Inventors: Hesse, Ingo
• Primary Examiner(s): Caputo, Lisa
• Assistant Examiner(s): HOPKINS, BRANDI N
• Application Number:
  US14/321,251
• Publication Number:
  US 20150007667A1
• Time in Patent Office: 973 Days
• Field of Search: 737/88, 156/307.3, 156/536, 296/187.03, 244/213
• US Class Current: 1/1
• CPC Class Codes: G01N 2033/0003 Composite materials
• CPC Class Codes: G01N 2203/0252 Monoaxial, i.e. the forces being applied along a single axis of the specimen
• CPC Class Codes: G01N 2203/0264 Beam
• CPC Class Codes: G01N 2203/04 Chucks, fixtures, jaws, holders or anvils
• CPC Class Codes: G01N 3/02 Details
• CPC Class Codes: G01N 3/08 by applying steady tensile or compressive forces G01N3/28 takes precedence
• CPC Class Codes: G01N 3/32 by applying repeated or pulsating forces
• CPC Class Codes: G01N 33/00 Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00

Abstract

The invention relates to a test piece for determining a specific material property of a fiber-reinforced plastic composite under applied mechanical loading.

According to the invention, it is provided that an inner core is incorporated in a composite with the fiber-reinforced plastic, the inner core being widened in a transverse axis in relation to the mechanical load in such a way that the composite with the inner core has a greater buckling stability than a comparative body, such as the composite without the inner core, and that the inner core is formed in such a way that an influence on the specific material property to be determined of the fiber-reinforced plastic composite lies in a range of acceptance.

Claims

1. A test piece including a specimen of fiber-reinforced plastic composite for determining a specific material property of the fiber-reinforced plastic composite under applied mechanical loading, the test piece comprising:

an inner core incorporated in the composite with the fiber-reinforced plastic composite, the inner core being widened in a transverse axis in relation to the applied mechanical load, wherein the fiber-reinforced plastic composite with the inner core has a greater buckling stability than the fiber-reinforced plastic composite without the inner core, and wherein the inner core'"'"'s influence on the specific material property to be determined of the fiber-reinforced plastic composite lies in a range of measuring error,

wherein the test piece includes an outer surface and at least one strain gage located on the outer surface, wherein mechanical loads are applied to the test piece corresponding to at least one of tensile loading and compressive loading, wherein the mechanical loads correspond to dynamic loading, and

the test piece including ends tapering to a surface area and adapted to fit into a fixing device.

2. The test piece as claimed in claim 1, wherein the inner core forms an inner layer of a layer system.

3. The test piece as claimed in claim 1, wherein the inner core comprises an expanded plastic that includes a filler material.

4. The test piece as claimed in claim 1, wherein the test piece can be described by a substantially rectangular, elongate geometry and has outer dimensions of at least 0.5 cm in thickness, at least 2 cm in width and at least 20 cm in length.

5. The test piece as claimed in claim 1 wherein the fiber-reinforced plastic composite is a layer system that includes the inner core as an inner layer and the tapered ends do not include the inner core.

6. A method of testing a test piece as claimed in claim 1, the method comprising:

clamping a first end of the test piece in a first fixing device of a test stand;

clamping a second end of the test piece in a second fixing device of the test stand; and

applying at least one of a tensile load and a compressive load to the test piece.

7. A method of manufacturing a component of a wind turbine generator system, the method comprising:

testing the test piece as claimed in claim 1; and

using the test piece to form the component.

8. The method as claimed in claim 7, wherein the component of the wind turbine generator system is a rotor blade.