Digital display biaxial orientation polypropylene pearl films tensile tester

Digital display biaxial orientation polypropylene pearl films tensile tester

1. introductions

Digital display biaxial orientation polypropylene pearl films tensile testing machine adopts digital LCD screen display test force and displacement, can be used to measure and determine breaking tensile force, tensile strength and elongation of films. When doing tensile test, a rectangle sheets with 150mm length and 15mm width cut from the biaxial orientation polypropylene pearl films is used as s standard specimen, and the tensile test speed is 150mm/min.

2. relative manufacturing and calibrating test method for testing machine

GB/T2611 general requirements for testing machines

GB/T16491 electronic universal testing machine

GB/T16825.1 verification of static uniaxial testing machines --- part 1: tension / compression testing machines --- verification and calibration of the force measuring system

ISO7500-1 metallic materials--- verification of static uniaxial testing machine --- part 1: tension / compression testing machines --- verification and calibration of the force measuring system

ASTM E4 standard practice for force verification of testing machines

EN 10002-2 tensile testing of metallic materials --- part 2: verification of the force measuring system of the tensile testing machine

3. relative tensile test method for biaxial orientation polypropylene pearl films

BB/T 0002 biaxial orientation polypropylene pearl films

GB/T 1040.3, ISO 527-3 plastics --- determination of tensile properties --- part 3: test conditions for films and sheets

4. specification of testing machine

No

Item

Specification

1

Frame

Single column, LCD display

2

Force capacity

100N,200N,500N,1000N,2000N,5000N

3

Operating menu

English

4

Force measuring range

2%-100%FS

5

Accuracy grade

Grade 1

6

Error of test force

Less than ±1% of set value

7

Resolution of test force

0.1N

8

Resolution of displacement

0.01mm

9

Error of deformation value

Less than ±1%

10

Display item

Test force, displacement, peak value, test state, test   speed

13

Motor power

0.75KW

14

Crossbeam speed

0.1-500mm/min

15

Crossbeam stroke

800mm(Space can according to clients)

16

Tensile space

650mm(Space can according to clients)

17

Compress space

650mm(Space can according to clients)

18

Dimension

520x480x1550mm

23

Voltage

220V,50Hz

24

Weight

80kg


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How to Select the Right Tensile, Compression, Bending, Shear, Peel, and Tear Testing Machine: Calculation Formulas with Examples

Selecting the appropriate testing machine for tensile, compression, bending, shear, peel, and tear tests requires careful consideration of multiple factors, including the force range, specimen dimensions, test standards, and machine capabilities. Below are the key calculation formulas to help determine the necessary machine specifications, along with examples for better understanding.

1. Tensile Testing Machine Selection

Tensile testing machines measure the maximum tensile strength and elongation of materials.

Key Formula:

Fmaxmax × A

Where:

Fmax = Maximum required force (N)

σmax = Ultimate tensile strength of the material (MPa)

A = Cross-sectional area of the specimen (mm²)

Example: For a steel specimen with σmax =400MPa and cross-sectional area A =100mm²:

Fmax=400 × 100=40,000N (40kN)

A 50 kN tensile testing machine would be suitable.

 

2. Compression Testing Machine Selection

Compression tests determine a material's resistance to compressive forces.

Key Formula:

Fmaxc × A

 

Where:

Fmax = Maximum required force (N)

σc = Compressive strength of the material (MPa)

A = Cross-sectional area of the specimen (mm²)

Example: For a concrete cube with σc =30MPa and A =1502=22,500mm²:

Fmax=30 × 22,500=675,000N (675kN)

A 1000 kN compression testing machine would be ideal.

 

3. Bending Testing Machine Selection

Bending tests evaluate the flexural strength of materials.

Key Formula for Three-Point Bending:

image.png

Where:

σf = Flexural stress (MPa)

F= Applied force (N)

L= Span length (mm)

b= Width of the specimen (mm)

h= Thickness of the specimen (mm)

Example: For a wooden beam with L=500mm, b=50mm, h=25mm, and requiring a stress of 10 MPa:

image.png

A 5 kN bending tester would be suitable.

4. Shear Testing Machine Selection

Shear tests determine the shear strength of materials.

Key Formula:

Fmax=τ × A

Where:

Fmax = Maximum shear force (N)

τ= Shear strength of the material (MPa)

A = Shear area (mm²)

Example: For an aluminum sheet with τ=90 MPa and A=200mm²:

Fmax=90×200=18,000N(18kN)

A 20 kN shear testing machine is recommended.

 

5. Peel Testing Machine Selection

Peel tests measure the adhesion strength between bonded materials.

Key Formula:

image.png

Where:

P= Peel strength (N/mm)

F= Measured force (N)

W= Width of the specimen (mm)

Example: For a tape with F=50N and W=25mm:

image.png

A peel testing machine with at least 5 N force capacity is required.

 

6. Tear Testing Machine Selection

Tear tests determine the resistance of a material to tearing forces.

Key Formula:

image.png

Where:

Ftear= Tear strength (N/mm)

F= Measured force (N)

t= Thickness of the specimen (mm)

Example: For a rubber sheet with F=100N and t=2mm:

image.png 

A tear testing machine with 100 N capacity is needed.

 

When selecting a testing machine, ensure that the maximum force capacity of the machine is at least 1.2 to 1.5 times the calculated force to account for safety margins and unexpected variations. Additionally, consider compliance with relevant test standards (ASTM, ISO, GB, EN, JIS) and machine features such as speed control, data acquisition, and test automation.

By using the above formulas and examples, engineers and manufacturers can accurately determine the appropriate testing machine specifications for their specific material and application requirements.