拉伸冲击试验机 拉伸冲击检测设备GB/T 13525

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产地: 承德冲击试验机
发货地址: 开发区东区
 
 
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拉伸冲击试验机 拉伸冲击检测设备GB/T 13525的详细介绍 相关文档: PDF DOC TXT
XJL拉伸冲击试验机
                     
用途:
 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。
符合标准:
GB/T 13525-92《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》
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。
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:(15~35)℃
7)试样尺寸:长度80±2mm 宽度15±0.5mm 厚度<4mm
夹具间的**长度:30±2mm
2)            电源: 220VAC-15%~220VAC 10% 50HZ (单相三线制)
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,J
 XJL tensile shock tester
 
USES:
It is mainly used to measure the energy required for the fracture of plastic samples at the prescribed tensile impact velocity.
Used to measure the brittleness and toughness of nonmetallic materials such as plastics.
Meet the standard:
Test methods of plastic stretch impact performance
ASTM d1822-2006 "test method for the tensile impact energy required to fracture the plastic and electrical insulating materials"
ISO 8256-2004 plastics - stretch - impact strength measurement
Term: tensile impact strength: the ratio of the impact energy consumed by the tensile impact of the specimen can be compared with the ratio of the smallest cross section before the sample test
Elongation of permanent fracture: the rate of change of the measured distance of the fracture part of the fracture in 1min after sample fracture (%).
Working principle: sample end fixed on the fixture of pendulum impact testing machine, the other end fixed on t, provided by energy, a one-way swinging pendulum impact t-head, make sample damage under high tensile deformation rate, cross head thrown together with the part of the specimen, determine the consumption of pendulum energy and range of samples before and after damage, after correction, calculate the tensile yield strength and the elongation at break of permanent sample.
Test results of different tyPES or sizes can not be compared.
 
Test equipment:
1. The pendulum of the test machine must be a rigid pendulum and a sample of 2mm thick. The center of the physical collision of the pendulum must be overlapped with the center of the sample thickness.
2. The clamping device of the test machine shall not cause the specimen to be clamped and sliding in the test, the clamping jaw may have the teeth of the file, the size of the teeth may vary according to the sample.
3. The tee head shall be made of light and very low elastic materials and shall not be subjected to plastic deformation during the impact.
Sample: the sample is made from injection molding or machining.
Thin film or sheet sample can be cut by punching knife.
During the process of making samples, no sample overheating should occur.
If the coolant is used in machining, the sample performance should not be affected.
The sample should have no damage on the surface, no defect in the interior and uniform thickness.
The specimen marks shall not affect the sample performance.
Hard materials should not be distorted.
If different tensile shock properties are shown in each direction of the measured material, the samples should be sampled in different directions.
Sample shape and size: the thickness of specimen shall be 1mm first.
The sample made by the product shall retain the original thickness;
The specimen with thickness of more than 4mm shall be machined to 4mm.
For thin films, you can use multi-layer samples, but they should be well overlapped.
Sample quantity: at least 5 samples or according to product standard.
Technical parameters:
1) impact speed: 3.8m/s
2) impact energy: 15J and 25J
3) pendulum torque: pd15J=8.03848Nm pd25J=13.39746Nm
4) pendulum early Yang Angle: 150 °
5) striking center distance: 395mm
6) temperature: (15 ~ 35 ℃
7) sample size: length 80 + + 2mm width 15 plus or minus 0.5mm thickness <4mm
** length of fixture: 30 + 2mm
2) power supply: 220 vac - 15% ~ 10% of the 220 vac 50 hz single-phase three-wire system ()
Select the appropriate pendulum to make the impact energy reading within the range of the test machine, and refer to the following table:
(try to choose a small "t-head" with a small quality when you can clamp the sample)
Pendulum impact energy J t - head mass g
15.0
25.0 to 30 + 1 or 60 + 1
60 + / - 1 or 120 + 1
Calculation and representation of test results:
1. Calculation of tensile impact strength:
Type 1
W.
E = x 1000
D * h
In the formula: E - tensile impact strength, KJ/m2
W-corrected sample destruction of energy consumed, J
D - sample thickness, mm (mm)
H - sample width, mm (mm)
The experimental results show that the three valid digits are given by the arithmetic mean of tensile impact strength of each set of sample.
2. Energy correction
The energy used in the energy Ws consumed by the pendulum impact sample, including the energy consumed by the t-tip, must be calibrated to produce the energy consumed by the sample destruction.
 
Corrected sample destruction of energy W by type 2 calculation:
 
 
Type 2
W 'W"
W =
2
In the formula: W - corrected sample destruction of the energy consumed, J
W '- the energy consumed by sample destruction during elastic collision, J
W - the energy consumed by sample destruction during inelastic collisions, J

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