| 查看: 1150 | 回复: 8 | |||
| 当前主题已经存档。 | |||
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 ] |
回复此楼» 猜你喜欢
0703 物理化学调剂
已经有5人回复
-
化学工程321分求调剂
已经有7人回复
-
0703化学调剂 290分有科研经历，论文在投
已经有7人回复
-
308求调剂
已经有3人回复
-
本人考085602 化学工程 专硕
已经有10人回复
-
焦虑
已经有9人回复
-
0856求调剂
已经有3人回复
-
283求调剂
已经有11人回复
-
深圳大学硕士招生（2026秋，传感器方向，仅录取第一志愿）
已经有8人回复
-
0703化学调剂
已经有7人回复
groom
木虫 (著名写手)
- 应助: 5 (幼儿园)
- 金币: 4944.5
- 散金: 23
- 红花: 2
- 帖子: 1543
- 在线: 694.9小时
- 虫号: 119949
- 注册: 2005-11-28
- 性别: GG
- 专业: 高分子合成化学
2楼2008-04-28 21:16:13
3楼2008-04-29 08:46:23
liufeng212
金虫 (小有名气)
- 应助: 0 (幼儿园)
- 金币: 1051.8
- 散金: 100
- 帖子: 184
- 在线: 6.5小时
- 虫号: 518930
- 注册: 2008-03-05
- 性别: GG
- 专业: 橡胶及弹性体
4楼2008-05-01 10:18:15
sishu
木虫 (著名写手)
- 应助: 1 (幼儿园)
- 金币: 5536.2
- 散金: 62
- 红花: 3
- 帖子: 1369
- 在线: 85.1小时
- 虫号: 119472
- 注册: 2005-11-28
- 性别: GG
- 专业: 聚合物共混与复合材料
5楼2008-05-01 10:28:40
★
wellok101(金币+1,VIP+0):鼓励一下，欢迎常来高分子版进行学术交流！
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 ] |
6楼2008-05-01 15:26:47
liufeng212
金虫 (小有名气)
- 应助: 0 (幼儿园)
- 金币: 1051.8
- 散金: 100
- 帖子: 184
- 在线: 6.5小时
- 虫号: 518930
- 注册: 2008-03-05
- 性别: GG
- 专业: 橡胶及弹性体
7楼2008-05-05 15:12:37
qd-laowang
至尊木虫 (知名作家)
- 应助: 2 (幼儿园)
- 金币: 10603.6
- 红花: 5
- 帖子: 5935
- 在线: 233.8小时
- 虫号: 326864
- 注册: 2007-03-18
- 性别: GG
- 专业: 橡胶及弹性体
8楼2008-05-05 18:30:48
20