RY Strain Gauge Rosettes with 3 Measuring Grids for Analyzing Biaxial Stress States with Unknown Principal Directions

RY strain gauges have 3 measuring grids arranged at an angle of 0°/45°/90° (types RY1, RY3, RY8, RY9, RY10), or 0°/60°/120° (types RY4, RY7). These strain gauges (SGs) are an appropriate choice for analyzing the biaxial stress state with unknown principal directions.

With these types we offer you strain gauges (SG) in various geometries and sizes, each available with temperature responses adapted to the following materials:

  • Ferritic steel (10.8 ppm/K; 6.0 ppm/°F); temperature matching codes: 1
  • Aluminum (23 ppm/K; 12.8 ppm/°F); temperature matching codes: 3
  • Austenitic steel (16 ppm/K, 8.9 ppm/°F); temperature matching codes: 5
  • Silica/composite (0,5 ppm/K; 0.3 ppm/°F); temperature matching codes: 6
  • Titanium and gray cast iron (9 ppm/K; 5.0 ppm/°F); temperature matching codes: 7
  • Plastic (65 ppm/K; 36.1 ppm/°F); temperature matching codes: 8
  • Molybdenum (5.4 ppm/K; 3.0 ppm/°F); temperature matching codes: 9

Insert the temperature matching code in place of the placeholder “x” to get the ordering number of the strain gage you need. Strain gauges with # characterized are only available in matches for aluminum, ferritic and austenitic steel.

Save time and efforts: RY8 strain gauges are available as pre-wired versions with connection cable

Strain gauges available in 120 and 350 Ohms


Measuring grid consists of constantan, measuring grid carrier is polymide


Fast delivery for preferred strain gauge types -  available from stock! 

 

Ordering number 

Nominal (rated) resistance

Dimensions [mm/inch]

Vmax 

Solder terminals

Preferred types

Measuring grid

Carrier

Ω

a1

a2

b

c

d


 

1-RY1x-3/120#

120

0.8
0.031

3
0.118

0.8
0.031
7
0.276
7
0.276
1.5 LS7 1
1-RY1x-6/120

120

2
0.079

6
0.236

1.4
0.055
11
0.433
11
0.433
3 LS5 1,3

1-RY1x-10/120

120

2.9
0.114

10
0.394

2.7
0.106
15.4
0.606
15.4
0.606
5 LS4 1

 

 

 

Ordering number

Nominal (rated) resistance

Dimensions [mm/inch]

Vmax 

Solder terminals are not compulsory

Preferred types

Measuring grid

Carrier

Ω

a1

a2

b

d

 

1-RY3x-3/120#

120

0.8
0.031

3
0.118

0.8
0.031

6.9
0.272

1.5

LS7

1

1-RY3x-6/120

120

2
0.079

6
0.236

1.4
0.055

11
0.433

3

LS5

1,3

1-RY3x-10/120

120

2.9
0.114

10
0.394

2.7
0.106

15.4
0.606

5

LS4

1

 

 

 

Ordering number

Nominal (rated) resistance

Dimensions [mm/inch]

Vmax

Solder terminals

 

 

Preferred types

Measuring grid

Carrier

Ω

a1

a2

b

c

d

 

1-RY4x-3/120#

120

0.8
0.031

3
0.118

0.8
0.031
7
0.276
7
0.276
1.5 LS7 -

1-RY4x-6/120

120

2
0.079

6
0.236

1.4
0.055
11
0.433
11
0.433
3 LS5 1

1-RY4x-10/120

120

2.9
0.114

10
0.394

2.7
0.106
15.4
0.606
15.4
0.606
5 LS4 1

 

 

 

Ordering number

Nominal (rated) resistance

Dimensions [mm/inch]

Vmax

Solder terminals are not compulsory

Preferred types

Measuring grid

Carrier

Ω

a1

a2

b

d

 

1-RY7x-3/120#

120

0.8
0.031

3
0.118

0.8
0.031
6.9
0.272
1.5 LS7 -

1-RY7x-6/120

120

2
0.078

6
0.236

1.4
0.055
11
0.433
3 LS5 -

1-RY7x-10/120

120

2.9
0.114

10
0.394

2.7
0.106

15.5
0.606

5

LS4

-

 

 

 

Ordering number

Nominal (rated) resistance

Dimensions [mm/inch]

Vmax

Solder terminals are not compulsory

 

 

Preferred types

Measuring grid

Carrier

Ω

a

b

c

d

 

1-RY8x-0.6/120#

120

0.6
0.024

1.1
0.043
4.8
0.189
8.7
0.343
1.6 LS7 -

1-RY8x-1.5/120  

120

1.5
0.059

1.2
0.047
8.2
0.323
14.6
0.575
2.5 LS7 1

1-RY8x-3/120

120

3
0.118

1.1
0.043
9.7
0.382
14.6
0.575
3 LS7 1,3

1-RY8x-6/120

120

6
0.236

3
0.118
13
0.512
22.9
0.902
7.5 LS7 1

1-RY8x-1.5/350#

350

1.5
0.059

1.6
0.063
8.2
0.323
14.6
0.575
5 LS7 -

1-RY8x-3/350

350

3
0.118

1.2
0.047
9.7
0.382
14.6
0.575
5.5 LS7 -

1-RY8x-6/350

350

6
0.236

2.8
0.11
13.1
0.516
22.9
0.902
13 LS5 1

 

 

 

Ordering number

Nominal (rated) resistance

Dimensions [mm/inch]

Vmax

Solder terminals

 

 

Preferred types

Measuring grid

Carrier

Ω

a

b

c

d

 

1-RY9x-1.5/120

120

1.5
0.059

1.3
0.051
9
0.354
8
0.315
1.5 LS7 1

1-RY9x-3/120

120

3
0.118

1.3
0.051
9
0.354
9
0.354
2 LS7 1,3

1-RY9x-6/120   

120

6
0.236

2.6
0.102
12.5
0.492
11.4
0.449
4.5 LS7 1,3

1-RY9x-10/120

120

10
0.394

4
0.157
17.5
0.689
16
0.63
7 LS7 1

1-RY9x-1.5/350#

350

1.5
0.059

1.5
0.059
8
0.315
9
0.354
2.5 LS7 1

1-RY9x-3/350

350

3
0.118

1.5
0.059
9
0.354
9
0.354
3.5 LS7

1,3

1-RY9x-6/350

350

6
0.236

2.6
0.102
12.5
0.492
11.4
0.449
6 LS7 1,3

1-RY9x-10/350

350

10
0.394

4
0.157

17.6
0.693

16
0.63

11.5

LS7

-

 

 

 

Ordering number

Nominal (rated) resistance

Dimensions [mm/inch]

Vmax

Solder terminals

 

 

Preferred types

Measuring grid

Carrier

Ω

a

b

c

d

 

1-RY10x-1.5/120

120

1.5
0.059

1.4
0.055
8.2
0.323
13.5
0.531
2.5 LS7 1

1-RY10x-3/120   

120

3
0.118

1.1
0.043
9.7
0.382
13.5
0.531
3 LS7 3

1-RY10x-6/120  

120

6
0.236

3
0.118
16.4
0.646
22.9
0.902
7.5 LS4 -
1-RY10x-1.5/350#

350

1.5
0.059

1.4
0.055
8.2
0.3232
13.5
0.531
5 LS7 1,3

1-RY10x-3/350

350

3
0.118

1.2
0.047
9.7
0.382
13.5
0.531
5.5 LS7 1,3

1-RY10x-6/350

350

6
0.236

2.8
0.11
16.4
0.646
22.9
0.902
12 LS4 1,3,6

 

 

Notes on Calculating the First and Second Principal Stress

The 3 measuring grids of the rosettes are designated with the letters a, b and c. Accordingly the 3 strains εa, εb, and εc are measured with a 3 measuring grid rosette. The principal normal stresses σ1 and σ2 are calculated for the 0°/45°/90° rosette using the formula:

and for the 0°/60°/120° rosette:

The principal directions are determined below. First the tangent of an auxiliary angle ψ is calculated. For the 0°/45°/90° rosette using the formula:

and for the 0°/60°/120° rosette according to the formula:

Note: The tangent of an angle in the right-angled triangle is the ratio of the opposite side (numerator N) to the adjacent side (denominator D):

This ambiguity of the tangent makes it necessary to determine the signs of the numerator (N) and the denominator (D) before carrying out the final calculation of the two above mentioned quotients. It is important to determine the sign because that is the only way to know which quadrant of the circle the angle ψ will be found in. First determine the value of the intermediate angle ψ from the value of the tan:

Then determine the angle ϕ using the following approach:

Apply the angle ϕ that is found in this manner starting from the axis of the reference measuring grid a in a mathematically positive direction (counterclockwise). The axis of the measuring grid a forms one arm of the angle ϕ. The other arm represents the first principal direction. This is the direction of the principal normal stress σ1 (identical with the principal strain direction ε1). The point of the angle is located at the intersection of the measuring grid axes. The second principal direction (the direction of principal normal stress σ2) has the angle ϕ+90°.

The measuring grid consists of constantan; the material of the measuring grid carrier is polyimide.

RY6/RY8 strain gauges also come with a connection cable! One practical solution with many advantages: No soldering required at the measuring point, available in cable lengths from 0.5 m to 10 m, with RJ11 plug on request. A fluoropolymer-insulated wire on the strain gauge prevents the cable from sticking during installation. A practical solution for you...!

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