Tensile test geometry

Patent metadata

Field	Value
Publication number	US-2016169783-A1
Application number	US-201414903935-A
Country	US
Kind code	A1
Filing date	Jul 9, 2014
Priority date	Jul 9, 2013
Publication date	Jun 16, 2016
Grant date	—

Abstract

A plated polymer test specimen for measuring strain imparted to the plated polymer test specimen includes a polymeric substrate including a top, a bottom, a pair of opposing edges and a pair of opposing end edges, the top and bottom being plated with top and bottom metal layers respectively, the side edges and the end edges being at least substantially free of plating. The substrate includes two spaced-apart holes that extend through the top metal layer, substrate and the bottom metal layer. Alternatively, the substrate may comprise a composite layup structure. A method for testing the strain imparted to a plated polymer test specimen is also disclosed.

First claim

What is claimed is:

1 . A plated polymer test specimen for measuring strain imparted to the plated polymer test specimen, the plated polymer test specimen comprising:
a polymeric substrate including a top, a bottom, a pair of opposing edges and a pair of opposing end edges, the top and bottom being plated with top and bottom metal layers respectively, the side edges and the end edges being at least substantially free of plating; and the substrate including two spaced-apart holes that extend through the top metal layer, substrate and the bottom metal layer.

2 . The test specimen of claim 1 wherein the holes receive pins that are connected to a strain-measuring device.

3 . The test specimen of claim 1 wherein the holes are not round.

4 . The test specimen of claim 1 wherein the holes are each lined with a bushing.

5 . The test specimen of claim 1 wherein the test specimen has a profile in accordance with ASTM-638, Type IV.

6 . The test specimen of claim 1 wherein the polymeric substrate includes a narrow middle gage region disposed between and connected to two grip regions, the grip regions being wider than the narrow middle gage region, each hole extending through one of the grip regions.

7 . The test specimen of claim 6 wherein grip regions have non-planar profiles.

8 . A plated polymer test specimen for measuring strain imparted to the plated polymer test specimen, the plated polymer test specimen comprising:
a composite layup structure including a top, a bottom, a pair of opposing edges and a pair of opposing end edges, the top and bottom being plated with top and bottom metal layers respectively, the side edges and the end edges being at least substantially free of plating; and the substrate including two spaced-apart holes that extend through the top metal layer, composite layup structure and the bottom metal layer.

9 . The test specimen of claim 8 wherein the composite layup structure includes a plurality of layers, at least some of which are fiber reinforced.

10 . The test specimen of claim 8 wherein the composite layup structure includes at least one layer that includes fibers that extend around the spaced-apart holes.

11 . The test specimen of claim 8 wherein the composite layup structure includes at least two layers with reinforcing fibers, the fibers of one layer being disposed transversely to the fibers of the other layer.

12 . The test specimen of claim 8 wherein the holes receive pins that are connected to a strain-measuring device.

13 . The test specimen of claim 8 wherein the holes are not round.

14 . The test specimen of claim 8 wherein the holes are each lined with a bushing.

15 . The test specimen of claim 8 wherein the test specimen has a profile in accordance with ASTM-638, Type IV.

16 . The test specimen of claim 8 wherein the composite layup structure includes a narrow middle gage region disposed between and connected to two grip regions, the grip regions being wider than the narrow middle gage region, each hole extending through one of the grip regions.

17 . A method for testing the strain imparted to a plated polymer test specimen, the method comprising:
loading a plated polymer test specimen comprising a polymeric substrate having a top, a bottom, a pair of opposing edges and a pair of opposing end edges, the top and bottom being plated with top and bottom metal layers respectively, the side edges and the end edges being at least substantially free of plating and the substrate including two spaced-apart holes that extend through the top metal layer, substrate and the bottom metal layer onto a strain-measuring device; and measuring the strain imparted to the plated polymer test specimen.

18 . The method of claim 17 wherein the polymeric substrate includes a composite layup structure.

19 . The method of claim 18 wherein the composite layup structure includes at least one layer that includes fibers that extend around the spaced-apart holes.

20 . The method of claim 18 wherein the composite layup structure includes at least two layers with reinforcing fibers, the fibers of one layer being disposed transversely to the fibers of the other layer.

Assignees

• United Technologies Corp

Inventors

• Levasseur Glenn
• Roach James T
• Cook Iii Grant O
• Kersey Raymond K

Classifications

• B32B2255/10

  on synthetic resin layer or on natural or synthetic rubber layer · CPC title

• G01N2203/0268

  Dumb-bell specimens · CPC title

• C23C18/1657

  Electroless forming, i.e. substrate removed or destroyed at the end of the process · CPC title

• C23C18/1653

  Two or more layers with at least one layer obtained by electroless plating and one layer obtained by electroplating · CPC title

• C23C18/1641

  Organic substrates, e.g. resin, plastic · CPC title