Converting Values To Stress; Auto-Balancing - Hioki MEMORY HiLOGGER LR8450 Instruction Manual

Converting values to stress

Multiply Young's modulus by the measured value.
σ (stress) = E (Young's modulus) × ε (measured value)
Example: When measuring compression stress
For an aluminum measurement target being measured using the 1-gage method, the following
table indicates a Young's modulus value of 73 (GPa).
9
σ = 73 × 10 × measured value × 10
= 73 × measured value (unit: kPa)
= 7.44* × measured value (unit: gf/mm
*: 1 Pa = 1.01971621 × 10
Conversion ratio = 7.44; unit: gf/mm
Set the scaling conversion ratio's slope to this value.
See "1.5 Using the Scaling Function" (p. 4 2).
Mechanical properties of industrial materials
Material
Carbon copper (C 0.1% to 0.25%)
Carbon copper (C >0.25%)
Spring steel (tempered)
Nickel steel
Cast iron
Brass (cast)
Phosphor bronze
Aluminum
Concrete
See "1.5 Using the Scaling Function" (p. 4 2).

Auto-balancing

You can execute auto-balance (correcting the input at zero) for strain gage channels.
See p. 2 8.
−6
(measured value unit: με)
2
)
−7 2
kgf/mm
2
Longitudinal elasticity modulus
(Young's modulus)
E (GPa)
206 to 211
20 to 29
Poisson's ratio
ν
205
206
205
98
78
118
73
Measuring Strain
11
0.28 to 0.3
0.28 to 0.3
0.28 to 0.3
0.28 to 0.3
0.2 to 0.29
0.34
0.38
0.34
0.1
273