2024年4月1日发(作者：丙雁凡)
关于IzOd 冲击强度的不同测试方法
和单位换算
Izod Impact Testing (Notched Izod)
ASTM D256 and ISO 180
:
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.
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
d 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.
en 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
:
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.
看完之后，以前的J/M 和KJ/M2 的单位换算总算清楚了，如果不考虑别的因
素，单从厚度上考虑，ISO是除以截面积，而ASTM是除以厚度，ASTM除掉缺
口后的宽度是10.2MM，那两者单位的换算就是J/M除以10.2后就是KJ/M2 ，
当然这个不考虑样条不同的影响。
willylou 2007-02-02 14:12
分析得好，我一直在为此而烦恼，现在终于可以进行大致的转化了。
bluemusic
楼主的这个帖子很好，终于可以搞清楚怎么回事了。
wanggw
很好，多谢LZ。我终于也搞清楚拉。
polymer
不错, 还是英文好,终于搞清楚了!
hai123
谢谢，终于搞清楚了
whb9112
谢谢楼主了阿！
浙江工业大学
是的啊,看了英文解释,其实也很简单和明了
------谢谢LZ
2007-02-12 15:04
2007-02-09 15:37
2007-02-06 13:58
2007-02-03 13:30
2007-02-03 10:01
2007-02-02 14:42
2024年4月1日发(作者：丙雁凡)
关于IzOd 冲击强度的不同测试方法
和单位换算
Izod Impact Testing (Notched Izod)
ASTM D256 and ISO 180
:
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.
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
d 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.
en 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
:
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.
看完之后，以前的J/M 和KJ/M2 的单位换算总算清楚了，如果不考虑别的因
素，单从厚度上考虑，ISO是除以截面积，而ASTM是除以厚度，ASTM除掉缺
口后的宽度是10.2MM，那两者单位的换算就是J/M除以10.2后就是KJ/M2 ，
当然这个不考虑样条不同的影响。
willylou 2007-02-02 14:12
分析得好，我一直在为此而烦恼，现在终于可以进行大致的转化了。
bluemusic
楼主的这个帖子很好，终于可以搞清楚怎么回事了。
wanggw
很好，多谢LZ。我终于也搞清楚拉。
polymer
不错, 还是英文好,终于搞清楚了!
hai123
谢谢，终于搞清楚了
whb9112
谢谢楼主了阿！
浙江工业大学
是的啊,看了英文解释,其实也很简单和明了
------谢谢LZ
2007-02-12 15:04
2007-02-09 15:37
2007-02-06 13:58
2007-02-03 13:30
2007-02-03 10:01
2007-02-02 14:42