Composite material V-notch shear performance tensile testing machine

Composite material V-notch shear performance tensile testing machine

1. introductions

The composite material V-notch shear performance tensile testing machine is controlled by computer software, which can display the test force, test time, test curve, displacement or deformation in real time. After the test, the test results can be automatically saved, and the test report can be printed by connecting to a printer. The composite material V-notch shear performance tensile testing machine is equipped with a special fixture to apply a load to the test specimen with a V-notch, and a shear stress field is formed in the central area of the sample notch, so as to measure the shear performance of the material.

2. relative test method for composite material V-notch shear performance tensile testing

GB/T 30970 test method for the shear properties of polymer matrix composite materials by V-notched beam method

ASTM D7079 standard test method for shear properties of composite materials by V-notch rail shear method

3. Relevant test methods for design, manufacture and inspection of tensile testing machine for V-notch shear performance of composite materials

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

4. technical specifications of composite material V-notch shear performance tensile testing machine

No

Item

Specification

1

Force   capacity

20KN   and lower

30/50KN

100KN

2

Measuring   range

1%-100%FS

3

Accuracy of force value

Less than ±1% of set value

4

Precision   of displacement

0.01mm

5

Accuracy   of displacement value

±1%

6

Deformation   measuring range

0.4%-100%FS

7

Accuracy   of deformation measuring

±0.5%

8

Resolution   of deformation

0.01mm

9

Force   speed range

0.005-5%FS/S

10

Accuracy   of force speed

Less   than ±1% of set value

11

Deformation   speed range

0.02-5%FS/S

12

Accuracy of deformation speed control

When set value is less than 0.05%FS,error is less than ±2.0%   of set value

When set value is more than 0.05%FS,error is less than ±0.5%   of set value

13

Displacement   speed range

0.001-500mm/min

14

Accuracy of displacement speed

When speed is less than 0.01mm/min,error is less than ±1.0% of set value

When set value is more than 0.01mm/min,error is less than ±0.2%   of set value

15

Range of constant force, constant deformation,   constant displacement control

0.5%~100%FS

16

Accuracy of constant force, constant deformation,   constant displacement control

When set value is less than 10%FS,error is less than ±1.0% of set value

When set value is more than 10%FS,error is less than ±0.1% of set value

17

Accuracy   of deformation speed

When set value is less than 0.05%FS,error is less than ±2.0%   of set value

When set value is more than 0.05%FS,error is less than ±0.5%   of set value

18

Tension   space

700mm

700mm

700mm

20

Voltage

Single   phase,220V±10%,50Hz(110V)

21

Motor   power

0.75KW

0.75KW

1.5KW

22

Dimension

750x480x1700mm

720x520x1800mm

900x600x2100mm

23

Weight

280kg

350kg

450kg

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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.