Machining: Tensile Test Specimens

  • Plate, Sheet, And Round Specimens:

 

  • Plate Specimens - This specimen is used for testing metallic materials in the form of plate, shapes, and flat material having a nominal thickness of 3/16 inch or over.  These specimens will be cut with the band saw or horizontal saw, depending on thickness, to approximate size.  The finished dimensions will be attained by using belt sander for proper size.  Care must be taken to avoid overheating during sanding.  Figure 1 of this document shows the proper dimensions for flat specimens.

 

  • Sheet Specimens – This specimen is used for testing metallic materials in the form of sheet, plate, flat wire, strip, band, hoop, rectangles, and shapes ranging in nominal thickness from .005 to 5/8 inch.  These specimens will be cut with the band saw of horizontal saw depending on thickness to approximate size.  The finished dimensions will be attained by using belt sander for proper dimensions.  Care must be taken to avoid overheating during sanding.  Figure 1 of this document shows the proper dimensions for flat specimens. 

 Figure 1:


Specimen 1

Specimen 2

Specimen 3

Specimen 4

Specimen 5


Full Size

Sub Sized

ASME

API

API


inches

inches

inches

inches

inches

G-Gage Length

2.00 ± 0.005

1.00 ± .003

2.00 ± 0.005

2.00 ± 0.005

2.00 ± 0.005

W-Width

.500 ± 0.010

.250 ± .005

.750 ± .031

1.00 ± .062

1.50 ± .125

T-Thickness






R-Radius of Fillet, min

0.500

0.250

1.00

1.00

1.00

A-Length of reduced section, min

2.25

1.25

2.25

2.25

2.25

B-Length of Grip Section, min

3.00

1.25

3.0

3.0

3.0

C-Width of Grip Section, approx.

0.75

0.375

1.0

1.5

2

 

 

  • Round Specimens - CMS uses the standard dimensions given in Figure 2 of this document. These  dimensions are determined by size of material submitted.  The largest size bar possible should be  machined for testing.  Round bars should be machined using lathes.  The bars should be machined to size using feeds and speeds best dictated by experience with the materials and conditions.  These dimensions are called out by ASTM-E-8.

 

 

 

 

DIMENSIONS

(INCHES)

 

Type

G

D

R

A

1-160

0.640 ± 0.005

0.160 ± 0.003

0.250

0.750

1-250

1.000 ± 0.005

0.250 ±0.005

0.250

1.250

1-500

2.000 ± 0.005

0.500 ±0.010

0.250

2.250

2-160

0.640 ± 0.005

0.160 ± 0.003

0.250

0.750

2-250

1.000 ± 0.005

0.250 ± 0.005

0.250

1.250

2-500

2.000 ± 0.005

0.500 ± 0.010

0.250

2.250