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XJL塑料拉伸冲击强度试验机
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XJL塑料拉伸冲击强度试验机 
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XJL塑料拉伸冲击强度试验机                      
   指针式控制,直观易于读数,液晶屏显示,自动计算冲击结果。
一 拉伸冲击试验机产品介绍

拉伸冲击试验机主要用于在规定的拉伸冲击速度下,测定塑料试样断裂所需能量的测试。 用于测定塑料等非金属材料的脆性、韧性。
二 拉伸冲击试验机符合标准:

GB/T13525《塑料拉伸冲击性能试验方法》

ASTM D1822-2006《使塑料及电绝缘材料断裂所需的拉伸冲击能量的测试方法》

ISO 8256-2004《塑料-拉伸-冲击强度的测定》

三 拉伸冲击试验机技术参数:

技术参数:

1)冲击速度:3.8m/s 
2)冲击能量:15J 、25J任选
3)摆锤力矩:pd15J=8.03848Nm pd25J=13.39746Nm
4)摆锤预扬角:150°
5)打击中心距:395mm
6)使用温度:(10~35)℃
7)试样尺寸:长度80±2mm 宽度15±0.5mm 厚度<4mm
夹具间的自由长度:30±2mm

2)  电源: 220VAC-15%~220VAC 10% 50HZ (单相三线制)

术语:拉伸冲击强度:试样受拉伸冲击力破坏所消耗的冲击能与试样试验前最小横截面的比值KJ/m2

永久断裂伸长率:试样断裂后1min时断裂部分拼接所测得的标距相对于原始标距的变化率(%)

工作原理:试样一端固定在摆锤式冲击试验机的夹具上,另一端固定在丁字头上,由摆锤的单程摆动提供能量,冲击丁字头,使试样在较高拉伸形变速率下破坏,丁字头与试样的一部分一起被抛出,测定摆锤消耗的能量及试样破坏前后的标距,经校正,计算得到试样的拉伸冲击强度和永久断裂伸长率。不同类型或不同尺寸的试样的试验结果不能比较。

试验装置:

1、试验机的摆锤必须为刚性摆锤,对2mm厚的试样,冲击时必须使摆锤的物理碰撞中心与试样厚度中心重合。

2、 试验机的夹具不得使试样被夹破裂和在试验中滑动,夹爪可有锉刀样的齿,齿的尺寸可因试样而异。

3、丁字头应由轻质和极低弹性的材料制成,在受冲击时不得发生塑性型变。

试样:试样由注塑或机械加工而成。薄膜或薄片试样可用冲刀裁取。在制样过程中不得出现试样过热现象。如在机械加工中使用冷却剂,应不影响试样性能。试样应表面无损伤,内部无缺陷,厚度均匀。试样标距的标记应不影响试样性能。硬质材料试样不得扭曲。如被测材料各方向表现出不同的拉伸冲击性能,应在不同方向上分别取样。

试样形状和尺寸:试样厚度优先选用1mm。由产品裁取的试样,保留原厚度;厚度大于4mm的试样应机械加工为4mm。对于很薄的薄膜,可以使用多层试样,但应重叠良好。

试样数量:至少5个试样或按产品标准的规定。


选择合适的摆锤使冲击能量读数在试验机有效范围内,参照下表:

(在能夹紧试样的前提下尽量选择质量小的丁字头)

摆锤冲击能量J

丁字头质量g

15.0

25.0

30±1或60±1

60±1或120±1

试验结果的计算和表示:

1、拉伸冲击强度的计算:

式1

          W

E=                ×1000

     d ×h

式中:E—拉伸冲击强度,KJ/m2

W—校正的试样破坏所消耗的能量,J

d—试样厚度,单位为毫米(mm)

h—试样宽度,单位为毫米(mm)

试验结果以每组试样拉伸冲击强度的算术平均值表示,取3位有效数字。

2、能量校正

由于摆锤冲击试样所消耗的能量Ws中包括丁字头飞出所消耗的能量,必须对能量进行校正,以求出试样破坏所消耗的能量。

校正的试样破坏所消耗的能量W按式2计算:

式2

       W′ W″

W=              

      2

式中:W—校正的试样破坏所消耗的能量,J

W′—弹性碰撞时试样破坏所消耗的能量,J

W″—非弹性碰撞时试样破坏所消耗的能量,


Tensile impact strength tester for XJL plastic

Pointer control, intuitive and easy to read, LCD display, automatic calculation of impact results.

Introduction of tensile impact testing machine

Tensile impact testing machine is mainly used for testing the energy required for fracture of plastic samples under the specified tensile impact speed. It is used to determine brittleness and toughness of nonmetallic materials such as plastics.

Two the tensile impact testing machine meets the standards:

GB/T13525 "test method for tensile impact properties of plastics"

ASTM D1822-2006 "test method for tensile impact energy required for fracture of plastics and electrical insulating materials"

ISO 8256-2004 "plastics tensile determination of impact strength"

Three tensile impact testing machine technical parameters:

Technical parameters:

1) impact speed: 3.8m/s

2) impact energy: 15J, 25J optional

3) pendulum torque: pd15J=8.03848Nm pd25J=13.39746Nm

4) pendulum preheating angle: 150 degrees.

5) strike center distance: 395mm

6) use temperature: (10~35) C

7) sample size: length 80 + 2mm width 15 + 0.5mm thickness <4mm

Free length of fixture: 30 + 2mm

2) power supply: 220VAC-15% to 220VAC 10% 50HZ (single phase three wire system)

Terminology: Tensile Impact Strength: The ratio of the impact energy consumed by tensile impact failure of the specimen to the minimum cross-section of the specimen before testing, KJ/m2

Permanent elongation at break: the rate of change (%) of the gauge measured by splicing the fractured parts with respect to the original gauge at 1 minute after fracture

Working Principle: One end of the specimen is fixed on the jig of the pendulum impact testing machine, the other end is fixed on the T-shaped head. The energy is provided by the one-way swing of the pendulum, and the T-shaped head is impacted. The specimen is destroyed at a higher tensile deformation rate. The T-shaped head is thrown out together with a part of the specimen, and the energy consumed by the pendulum and the specimen are measured. The tensile impact strength and the permanent elongation at break of the specimens were calculated after calibration. The test results of different types or sizes of samples can not be compared.

Test device:

1. The pendulum of the testing machine must be a rigid pendulum. When impacting a specimen 2 mm thick, the physical impact center of the pendulum must coincide with the thickness center of the specimen.

2. The clamp of the testing machine must not cause the sample to be clamped to break and slide during the test. The clamp claw may have a file-like tooth, and the tooth size may vary according to the sample.

3, the T-shaped head should be made of light and very low elastic material, and plastic deformation will not occur when subjected to impact.

Sample: the sample is made by injection or mechanical processing. Thin film or sheet sample can be cut by punching knife. The phenomenon of overheating of samples is not allowed during sample preparation. If coolant is used in mechanical processing, the performance of the sample shall not be affected. The specimen should be free from damage, with no defects and uniform thickness. The marking of specimen gauge should not affect the performance of the sample. Hard material specimens shall not be twisted. If the tested materials show different tensile impact properties in all directions, they should be sampled in different directions.

Sample size and shape: 1mm is preferred for specimen thickness. The sample cut from the product should be kept at the original thickness; the specimen with a thickness greater than 4mm should be machined to 4mm. For thin films, multi-layer specimens can be used but should overlap well.

Sample size: at least 5 samples or according to product standards.

Select the appropriate pendulum to make the impact energy reading in the effective range of the tester.

(try to choose a small T-shaped head on the premise of clamping the sample).

Impact energy of pendulum J

T-head quality G

Fifteen

Twenty-five

30 + 1 or 60 + 1

60 + 1 or 120 + 1

Calculation and expression of the test results:

1. Calculation of tensile impact strength:

Type 1

W

E= * 1000

D x H

Type: E - tensile impact strength, KJ/m2

W - corrected energy consumption of sample destruction, J

D - the thickness of the specimen is millimeter (mm).

H - the width of the specimen is millimeter (mm).

The test results were expressed by the arithmetic mean of tensile impact strength of each group, and 3 effective figures were obtained.

2. Energy correction

Since the energy Ws consumed by the pendulum impact specimen includes the energy consumed by the T-shaped head flying out, the energy must be corrected to calculate the energy consumed by the specimen failure.

The energy consumed by the corrected specimen is calculated according to formula 2: W.

Type 2

W 'W "

W=

Two

Medium: W - corrected energy consumption of sample destruction, J

W '- the energy consumed by specimen destruction during elastic collision, J

W "- energy consumed by specimen failure during inelastic collision.