PRODUCT
ZY-3000 Tensile Impact Testing Machine
ZY-3000 Tensile Impact Testing Machine
1. Purpose:
It is mainly used to determine the energy required to break the plastic sample under the specified tensile impact speed. Used to determine the brittleness and toughness of non-metallic materials such as plastics.
Meet the standard: GB/T 13525-92 "Plastic Tensile Impact Test Method"
Term: Tensile impact strength: the ratio of the impact energy consumed by the sample being damaged by the tensile impact force to the cross section of the sample before the test KJ/m2
Elongation at break: The rate of change of the gauge length measured by the splicing of the broken part relative to the original gauge length (%)
2. Technical parameters:
1) Impact speed: 3.8m/s
2) Impact energy: 15J, 25J optional
3) Pendulum moment: pd15J=8.03848Nm
pd25J=13.39746Nm
4) Pre-lift angle of pendulum: 150°
5) Strike center distance: 395mm
6) Operating temperature: (15~35)℃
7) Sample size:
Length 80±2mm Width 15±0.5mm Thickness <4mm
Maximum length between fixtures: 30±2mm
8) Power supply: 220VAC-15%～220VAC 10% 50HZ (single-phase three-wire system)
3. Working principle:
One end of the sample is fixed on the fixture of the pendulum impact testing machine, and the other end is fixed on the T-shaped head. The single-way swing of the pendulum provides energy and impacts the T-shaped head, causing the sample to break at a higher tensile deformation rate. The head and part of the sample are thrown out together, the energy consumed by the pendulum and the gauge length before and after the sample is measured are measured. After correction, the tensile impact strength and elongation at break of the sample are calculated. The test results of different types or sizes of samples cannot be compared.
4. Test device:
1. The pendulum of the testing machine must be a rigid pendulum. For a 2mm thick sample, the physical collision center of the pendulum must coincide with the thickness center of the sample during impact.
2. The gripper of the testing machine must not cause the sample to be broken and slide during the test. The gripper can have file-like teeth, and the size of the teeth may vary from sample to sample.
3. The T-shaped head should be made of light-weight and extremely low-elastic materials, and no plastic deformation should occur when impacted.
5. Sample:
The sample is made by injection molding or machining. Film or sheet samples can be cut with a punching knife. During the sample preparation process, the sample shall not overheat. If the coolant is used in machining, it should not affect the performance of the sample. The sample should have no damage on the surface, no internal defects, and uniform thickness. The marking of the sample gauge length shall not affect the performance of the sample. Hard material samples must not be twisted. If the tested material exhibits different tensile impact properties in various directions, samples should be taken in different directions.
Sample shape and size: 1mm is preferred for sample thickness. The sample cut from the product should retain the original thickness; the sample with a thickness greater than 4mm should be machined to 4mm. For very thin films, multiple samples can be used, but they should overlap well.
Number of samples: no less than 5 samples or according to product standards.
Choose a suitable pendulum to make the impact energy reading within the effective range of the testing machine, refer to the following table:
(On the premise that the sample can be clamped, try to choose a small T-shaped head)
Pendulum impact energy J T-shaped head mass g
15.0 30±1 or 60±1
25.0 60±1 or 120±1
Calculation and presentation of test results:
1. Calculation of tensile impact strength:
Where: E—tensile impact strength, KJ/m2
W—the energy consumed by the destruction of the corrected sample, J
d—The thickness of the sample, in millimeters (mm)
h—The width of the sample, in millimeters (mm)
The test results are expressed as the arithmetic average of the tensile impact strength of each group of samples, with 3 significant figures.
2. Energy correction
Since the energy consumed by the pendulum impacting the sample Ws includes the energy consumed by the T-shaped head flying out, the energy must be corrected to find the energy consumed by the damage of the sample.
The energy consumed by the corrected sample destruction W is calculated as follows:
In the formula: W—energy consumed by the destruction of the corrected sample, J
W′—the energy consumed by the destruction of the sample during elastic collision, J
W″—the energy consumed by the failure of the specimen during inelastic collision, J
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Yangzhou Zhengyi Testing Machinery Co., Ltd.
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