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小木虫论坛-学术科研互动平台 » 化学化工区 » 高分子 » 【求助】 落锤冲击实验机测得的冲击强度的单位是什么
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weileigaofenzi

木虫 (小有名气)

[交流] 【求助】 落锤冲击实验机测得的冲击强度的单位是什么

落锤冲击实验机测得的冲击强度的单位是什么？

[ Last edited by wellok101 on 2008-4-28 at 20:37 ]
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1楼 2008-04-28 20:23:30
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groom

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不知道是不是 kJ/m^2
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巴斯光年
2楼2008-04-28 21:16:13
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suxiaohuan3

银虫 (小有名气)
同意楼上。
（盘上读数-空载）/（厚mm*缺口处宽mm）
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3楼2008-04-29 08:46:23
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liufeng212

金虫 (小有名气)
一般就是KJ/M2，J/M，这两个单位也可以换算的啊
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4楼2008-05-01 10:18:15
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sishu

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引用回帖:
Originally posted by liufeng212 at 2008-5-1 10:18:
一般就是KJ/M2，J/M，这两个单位也可以换算的啊

请教层主，这两个单位怎么换算，这个问题困扰很久了。能否给出具体换算方式。
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智慧成就未来。
5楼2008-05-01 10:28:40
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phoenix15

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wellok101(金币+1,VIP+0):鼓励一下，欢迎常来高分子版进行学术交流！
根据测试的标准不同，单位也不同，GB,ISO单位是 KJ/m2  ASTM 单位J/m

关于怎么换算请看下面这个文章
Izod Impact Testing (Notched Izod)  
ASTM D256 and ISO 180
1.Scope:
Notched Izod Impact is a single point test that measures a materials resistance to impact from a swinging pendulum. Izod impact is defined as the kinetic energy needed to initiate fracture and continue the fracture until the specimen is broken. Izod specimens are notched to prevent deformation of the specimen upon impact. This test can be used as a quick and easy quality control check to determine if a material meets specific impact properties or to compare materials for general toughness.
2.Test procedure:
The specimen is clamped into the pendulum impact test fixture with the notched side facing the striking edge of the pendulum. The pendulum is released and allowed to strike through the specimen. If breakage does not occur, a heavier hammer is used until failure occurs. Since many materials (especially thermoplastics) exhibit lower impact strength at reduced temperatures, it is sometimes appropriate to test materials at temperatures that simulate the intended end use environment
3.Reduced Temperature Test procedure:
The specimens are conditioned at the specified temperature in a freezer until they reach equilibrium. The specimens are quickly removed, one at a time, from the freezer and impacted. Neither ASTM nor ISO specify a conditioning time or elapsed time from freezer to impact - typical values from other specifications are 6 hours of conditioning and 5 seconds from freezer to impact.  
4.Specimen size:  
The standard specimen for ASTM is 64 x 12.7 x 3.2 mm (2½ x ½ x 1/8 inch). The most common specimen thickness is 3.2 mm (0.125 inch), but the preferred thickness is 6.4 mm (0.25 inch) because it is not as likely to bend or crush. The depth under the notch of the specimen is 10.2 mm (0.4 inches).  
The standard specimen for ISO is a Type 1A multipurpose specimen with the end tabs cut off. The resulting test sample measures 80 x 10 x 4 mm. The depth under the notch of the specimen is 8mm
5.Data:
ASTM impact energy is expressed in J/m or ft-lb/in. Impact strength is calculated by dividing impact energy in J (or ft-lb) by the thickness of the specimen. The test result is typically the average of 5 specimens.
ISO impact strength is expressed in kJ/m2. Impact strength is calculated by dividing impact energy in J by the area under the notch. The test result is typically the average of 10 specimens.
The higher the resulting number, the tougher the material.

[ Last edited by phoenix15 on 2008-5-1 at 15:43 ]
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6楼2008-05-01 15:26:47
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liufeng212

金虫 (小有名气)
消耗的能量除以横截面积算出的是KJ/M2
消耗的能量除以横截面的长吧还是宽（具体不记得了，好久没做了）算出的是J/M
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7楼2008-05-05 15:12:37
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qd-laowang

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引用回帖:
Originally posted by phoenix15 at 2008-5-1 15:26:
根据测试的标准不同，单位也不同，GB,ISO单位是 KJ/m2  ASTM 单位J/m

关于怎么换算请看下面这个文章
Izod Impact Testing (Notched Izod)  
ASTM D256 and ISO 180
1.Scope:
Notched Izod Impact is a s ...

感谢，偶得好好学习下，记得应是采用的标准不同而引起的
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8楼2008-05-05 18:30:48
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