7075合金低温冲击过程中的能量分布和示波曲线分析

白光; 曲迎东; 李荣德; 苏睿明

doi:10.15980/j.tzzz.2019.07.026

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7075合金低温冲击过程中的能量分布和示波曲线分析
Energy Distribution and Oscillographic Curve Analysis of 7075 Alloy during Low Temperature Impact
2019年39卷第7期页码：800-802
纸质出版日期： 2019 ，
DOI： 10.15980/j.tzzz.2019.07.026

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[1]白光,曲迎东,李荣德,苏睿明.7075合金低温冲击过程中的能量分布和示波曲线分析[J].特种铸造及有色合金,2019,39(07):800-802.

Bai Guang, Qu Yingdong, Li Rongde, et al. Energy Distribution and Oscillographic Curve Analysis of 7075 Alloy during Low Temperature Impact[J]. Special Casting & Nonferrous Alloys, 2019,39(7):800-802.
[1]白光,曲迎东,李荣德,苏睿明.7075合金低温冲击过程中的能量分布和示波曲线分析[J].特种铸造及有色合金,2019,39(07):800-802. DOI： 10.15980/j.tzzz.2019.07.026.

Bai Guang, Qu Yingdong, Li Rongde, et al. Energy Distribution and Oscillographic Curve Analysis of 7075 Alloy during Low Temperature Impact[J]. Special Casting & Nonferrous Alloys, 2019,39(7):800-802. DOI： 10.15980/j.tzzz.2019.07.026.

摘要

研究了7075铝合金低温冲击过程中的能量吸收情况

冲击试验温度分别为0、-25、-50、-80、-120℃。试验发现

随着温度降低

7075铝合金的冲击裂纹形成功Ei逐渐增加

冲击裂纹不稳定扩展功Eup逐渐减小

但总功E

add

(即E

与E

之和)相对稳定。高冲击载荷下的平均强度功Est是影响7075铝合金低温冲击性能的主要因素

而高冲击载荷下的E

是由极值点前后（-50℃）平均冲击载荷F

ave

的增加和亚稳扩展位移d

的变化共同决定的。

Abstract

The energy absorption of the 7075 alloy during low temperature impact was investigated at 0

-25℃

-50℃

-80 ℃

-120 ℃

respectively.It is found that with the decrease of temperature

the impact crack shape energy Eiof the 7075 alloy is gradually increased

while the impact crack instability expansion energy Eupof the 7075 alloy is gradually reduced

however

the total energy Eadd（Eaddis the sum of Eiand Eup）is relatively stable.The average strength energy Estunder high impact load is the main factor on the low temperature impact behavior of 7075 alloy

and the average strength energy Estunder high impact load is determined by the increase of the average impact load Faveand the change of the metastable extended displacement dstjointly.