Methods for testing experimental results of electronic universal material testing machine

Methods for testing experimental results of electronic universal material testing machine

Calculation formulas for tensile machines and tensile testing machines:

1 The cross-sectional area of ​​the dumbbell-shaped test piece = thickness (cm) × parallel part width (cm) 1KG≠9.8N

2 Tensile strength TB (Kg/cm2) = tension force (Kg)F/test piece cross-sectional area (cO)A

Tensile strength Mpa (N/mm2) = tension force (N)F/test piece cross-sectional area (mO)A

3 Elongation EB ( % ) = () Pinpoint distance L1 - original pinpoint distance L0)/originpoint distance L0×100%

4 Adhesion strength TF (Kg/cO) = peeling force (Kg)F/test piece width (cm)b

Adhesion strength TF (N/mO ) = peeling force (N)F/test piece width (mm)b

5 Tear strength TS (Kg/cm2) = tension force (Kg)F/sample thickness (cm)t

Tear strength TS (N/mm2) = tension force (N)F/sample thickness (mm)t

6 Tensile stress Mn(Kg/cm2) = load (N)F/sectional area of ​​test piece (mO)A at a specific elongation

Tensile stress Mn(N/mm2) = load (N)F/sectional area of ​​test piece (mO)A at a specific elongation

(The n-system of Mn here represents a specific elongation (%), for example, the M300-system represents tensile stress when elongation is 300%.)

7 Elongation (%) = elongation amount/original length (clip spacing) * 100%

8 Number of test results: 4 test pieces are specified, but if there are insufficient test pieces, 3 or even 2 can be used. In this case, the number of test pieces must be indicated.

9 The calculation formula of tensile machine: Tensile strength and elongation: Tensile strength and elongation, arranged in the order of the measured value. They are S1, S2, S3 and S4, and are calculated according to the following calculations: a. When there are 4 test pieces: TB or EB=0.5S1+0.8S2+0.1(S3+S4) b. 3 test pieces: TB or EB=0.7S1+0.2S2+0.1S3 c. 2 test pieces: TB or EB=0.9S1+0.1S2 9.3 Stress Resistance: Tensile stress is represented by the average value of the measured value. Record: On the test result table, the following items must be recorded:

A. Tensile strength (Kg/cm2), elongation (%), tensile stress (Kg/cm2).

B. Capacity (capacity) of the test machine. C. The shape and number of the test piece. D. Test temperature. E. Other necessary matters.